Showing papers on "Stress corrosion cracking published in 2003"
TL;DR: In this paper, the authors developed a quantitative description of stress corrosion cracking on the secondary side of PWR steam generator tubing based on existing information from operating plants and from laboratory experiments.
Abstract: The work in this article is part of a project to develop a quantitative description of stress corrosion cracking (SCC) on the secondary side of pressurized water reactor (PWR) steam generator tubing based on existing information from operating plants and from laboratory experiments. This work is the second step in developing a predictive model for SCC on the secondary side. The first step involved developing a statistical framework into which dependencies of the various submodes of SCC can be inserted. The results of the present work will lead to quantitative descriptions of corrosion processes that, in turn, will be incorporated into the statistical framework. The chemistry of heat-transfer crevices will then be assessed to determine the proper inputs to the dependencies of the various submodes of SCC, and these will be connected to bulk environments. The modeling here is directed toward predicting the early occurrence of SCC that is too shallow to be detected by nondestructive examination (NDE)...
223 citations
25 Sep 2003-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the influence of microstructure on HIC and SSCC behavior of two low C-Mn-Nb-Mo API linepipe steels has been investigated.
Abstract: The chemical composition and microstructure are known to have a significant effect on the resistance to hydrogen induced cracking (HIC) and sulfide stress corrosion cracking (SSCC) of structural steels in wet H2S environments. In this paper, the influence of microstructure on HIC and SSCC behavior of two low C–Mn–Nb–Mo API linepipe steels has been investigated. Subjecting the steel to different thermomechanical processes modified the microstructure. The results showed that refined and homogeneous quenched and tempered bainite/martensite microstructures had the best performance with respect to both HIC and SSCC susceptibility.
160 citations
TL;DR: In this article, the authors reviewed the current understanding of the mechanisms of stress corrosion cracking of pipeline steels and considered the similarities, the differences and the influencing factors for the high pH and low pH stress corrosion cracks caused by a concentrated bicarbonate-carbonate solution.
Abstract: This paper reviews the current understanding of the mechanisms of stress corrosion cracking of pipeline steels. The similarities, the differences and the influencing factors are considered for the “high pH” stress corrosion cracking caused by a concentrated bicarbonate-carbonate solution, and for the “low pH” stress corrosion cracking due to a diluter solution. For high pH stress corrosion cracking, it is well accepted that the mechanism involves anodic dissolution for crack initiation and propagation. In contrast, it has been suggested that the low pH stress corrosion cracking is associated with the dissolution of the crack tip and sides, accompanied by the ingress of hydrogen into the pipeline steel. But the precise influence of hydrogen on the mechanism needs to be further studied.
154 citations
Book•
11 Sep 2003
TL;DR: In this article, the authors present an overview of the chemical properties of Corrosion Reactions in high-strength steels and their application in the electrical double layer of a de-noising circuit.
Abstract: 1 Introduction.- References.- 2 Corrosion Reactions and Corrosion Products.- References.- 3 Chemical Thermodynamics of Corrosion.- 3.1 Outline of Fundamentals.- 3.2 Calculating Gibbs Energies for Overall Reactions.- 3.3 Equilibrium Galvanic Cells.- 3.4 Galvanic Cells with Transference.- 3.5 More on Equilibrium Electrode Potentials.- 3.6 Calculating Elevated-Temperature Gibbs Energies.- References.- 4 The Electrolytic Mechanism of Corrosion.- 4.1 Overview.- 4.2 Reactions, Currents, and Potentials in Galvanic Cells.- 4.3 Measuring Current-Potential Curves.- 4.4 Uniform Corrosion: The Work of Wagner and Traud.- References.- 5 The Kinetics of Electrode Reactions.- 5.1 Hydrogen Deposition and Hydrogen lonisation.- 5.2 Oxygen Reduction and Oxygen Evolution.- 5.3 Metal Dissolution and Metal Deposition.- 5.4 Closer Inspection of the Electrical Double Layer.- References.- 6 Uniform Electrolytic Corrosion.- 6.1 Acid and Neutral Solutions.- 6.2 Neutral and Alkaline Solutions.- 6.3 The Dependence of Corrosion Rates on Temperature.- References.- 7 Adsorption Inhibitors of Acid Iron Corrosion.- References.- 8 Corrosion of Homogeneous Alloys.- 8.1 Introduction.- 8.2 Uniform Dissolution.- 8.3 Selective Dissolution and Dealloying.- 8.4 Dealloying of Hume-Rothery Phases and of Martensites.- References.- 9 Rusting of Iron and Steel.- References.- 10 Passivity.- 10.1 Introduction.- 10.2 Iron in Acid Solutions.- 10.3 Iron in Weakly Acid, Neutral, and Alkaline Solutions.- 10.4 Chromium and Iron-Chromium Steels.- 10.5 Nickel, Molybdenum, and Stainless Steels.- 10.6 Amorphous and Nanocrystalline Alloys.- 10.7 Semiconducting Oxide Films, Spontaneous Passivation, and Passivating Inhibitors.- 10.8 Titanium, Aluminum.- 10.9 Zinc, Magnesium.- 10.10 Oxide Films on Steels in High-Temperature Aqueous Solutions.- References.- 11 Galvanic Corrosion Cells.- 11.1 Dissimilar Metal Contact Corrosion.- 11.1.1 Introduction.- 11.1.2 Cells with Homogeneous Distribution of Current and Potential.- 11.1.3 Contact Corrosion Cells with Coplanar Electrodes.- 11.2 Differential Aeration Cells.- 11.3 Modeling Concentration Fields in Galvanic Cells.- References.- 12 Pitting Corrosion.- 12.1 General Aspects.- 12.2 Breakdown of Passivity and Pit Nucleation.- 12.3 Growth of Pit Nuclei.- 12.4 More on Aluminum and Aluminum Alloys.- 12.4.1 Weakly Alkaline Solutions.- 12.4.2 Neutral and Acid Solutions.- 12.4.3 The Nature of the Pitting Potential.- 12.5 More on Iron, Nickel, and Stainless Steel.- 12.6 A Note on Crevice Corrosion.- References.- 13 Intercrystalline and Intracrystalline Corrosion.- References.- 14 Hydrogen Embrittlement.- 14.1 Introduction.- 14.2 HIC by High-Activity Hydrogen in Low Strength Steels.- 14.3 HISCC by Low-Activity Hydrogen in High-Strength Steels.- References.- 15 Stress Corrosion Cracking.- 15.1 General Aspects.- 15.1.1 Introduction.- 15.1.2 Typical Results of SCC Testing.- 15.1.3 Modeling Stress Corrosion Mechanisms.- 15.2 Iron and Steels.- 15.2.1 Hydrogen-Induced SCC in High-Strength Steels.- 15.2.2 SCC of Mild Steel in Alkaline, Carbonate, and Nitrate Solutions.- 15.2.3 Stainless Steels.- 15.2.4 SCC in High-Temperature, High-Pressure Water.- 15.3 Titanium and Titanium Alloys.- 15.4 Precipitation Hardening Aluminum Alloys.- 15.5 General Aspects Continued.- References.- 16 Corrosion Fatigue.- 16.1 General Aspects.- 16.2 The Fracture Mechanical Approach.- References.- 17 Appendix.- 17.1 Anodic and Cathodic Protection.- References.- 17.2 Mass Transport by Diffusion.- References.- 17.3 Applications of Fracture Mechanics.- References.- 17.4 Electrode Impedance Spectroscopy.- 17.4.1 Introduction.- 17.4.2 The Basic Equivalent Circuit.- 17.4.3 Real Electrode Impedances.- 17.4.4 Laplace and Fourier Transforms.- 17.4.5 Adsorption and Relaxation Impedance.- 17.4.6 Filmed and Coated Electrodes.- 17.4.7 Some Recent Contributions.- References.- 17.5 Electrode Noise Spectroscopy.- References.
129 citations
TL;DR: In this paper, a series of experiments determined the threshold stress of various bolt metallurgies (900 MPa for 1355AXRC, and 800 MPA for MAC and MA840B steels) and showed that SCC begins in rock bolts when they are sheared by moving rock strata.
102 citations
01 Jan 2003
TL;DR: In this article, complete coverage of SCC for a variety of materials and SCC in different environments: carbon and low-alloy steels high-strength steels stainless steels nickel-base alloys copper alloys aluminum alloys magnesium alloys titanium alloys zirconium alloys uranium alloys amorphous alloys glasses and ceramics weldments in boiling water reactor service.
Abstract: Contents include: Complete coverage of SCC for a variety of materials and SCC in different environments: carbon and low-alloy steels high-strength steels stainless steels nickel-base alloys copper alloys aluminum alloys magnesium alloys titanium alloys zirconium alloys uranium alloys amorphous alloys glasses and ceramics weldments in boiling water reactor service.
97 citations
TL;DR: In this article, the initiation of stress corrosion cracking (SCC) was studied using scanning electron microscope observations of linearly increasing stress test specimens, which involved different features for these surfaces as follows.
96 citations
TL;DR: In this article, a finite element method (FEM) approach was used to predict the residual stresses induced by laser Peening on a 12% Cr-martensitic stainless steel and a 7075 aluminium alloy.
Abstract: Benefits from laser Peening have been demonstrated several times in fields like fatigue, wear or stress corrosion cracking. However, in spite of recent work on the calculation of residual stresses, very few authors have considered a finite element method (FEM) approach to predict laser-induced mechanical effect. This comes mainly from the high strain rates involved during LP (10 6 s -1 ), that necessitate the precise determination of dynamic properties, and also from the possible combination of thermal and mechanical loadings in the case of LP without protective coatings. In this paper, we aim at presenting a global approach of the problem, starting from the determination of loading conditions and dynamic yield strengths, to finish with FEM calculation of residual stress fields induced on a 12% Cr martensitic stainless steel and a 7075 aluminium alloy.
94 citations
15 Mar 2003-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the microstructures and the dislocation arrangements in the die cast AZ91D magnesium alloy as well as the stressed alloys have been investigated using transmission electron microscopy, high-resolution transmission electron microscope and energy dispersive X-ray (EDX) analysis.
Abstract: The microstructures and the dislocation arrangements in the die cast AZ91D magnesium alloy as well as the stressed alloys have been investigated using transmission electron microscopy, high-resolution transmission electron microscopy and energy dispersive X-ray (EDX) analysis. Besides the dominant α-Mg and β-Mg17Al12 phases, Al8Mn5 and Mg5Al phases have also been found and studied in the alloy. Dislocation pile-ups have been found in the stressed AZ91D alloys for the first time. They are confined in the slip planes and piled up against the grain boundaries. The dislocation pile-ups increase with deformation till about 2.1% and then remain almost identical even deformed to higher degree. The dislocations pile-ups in the AZ91D magnesium alloy are found to be beneficial to the resistance to stress corrosion cracking of the alloy, and thereby beneficial to the mechanical properties of the alloy. Dislocation networks are found to increase with deformation in all cases. The dislocation networks have also been found in the β-Mg17Al12 phase as well as in the matrix in the deformed AZ91D magnesium alloys.
88 citations
TL;DR: In this article, a micromechanics-based model for predicting the creep failure of hard rock under compression is presented, where the subcritical crack growth due to stress corrosion cracking and interaction effects between cracks are considered as the main mechanisms of creep failure.
83 citations
TL;DR: In this article, an inverse linear relationship between the corrosion product forces and the K ISCC values for stress corrosion cracking in three high strength aluminium alloys was found to be associated with the rate of intergranular corrosion.
TL;DR: In this paper, the authors summarized the evidence for hydrogen uptake in a low-strength alloy, AA5083, and its contribution to the stress-corrosion cracking of this alloy.
Abstract: There is growing evidence for hydrogen uptake in aluminum alloys and its contribution to the crack growth of high-strength aluminum alloys, but less evidence for low-strength alloys. This paper summarizes the evidence for hydrogen uptake in a low-strength alloy, AA5083, and its contribution to the stress-corrosion cracking of this alloy. A key factor is the anodic dissolution of grain boundary β phase (Al3Mg2) and the associated hydrogen reduction that accompanies this dissolution.
TL;DR: In this article, evidence is presented of the ingress of hydrogen to steels from near-neutral pH solutions at potentials in the vicinity of open-circuit values.
Abstract: While evidence is presented of the ingress of hydrogen to steels from near-neutral-pH solutions at potentials in the vicinity of open-circuit values, there is also evidence of dissolution ...
TL;DR: In this paper, a simulation model was applied to simulate the crack growth process, taking into account the interference between two cracks, which made it possible to analyze multiple crack growth behaviors for many cases that could not be studied by experiment only.
Abstract: When stress corrosion cracking or corrosion fatigue occurs, multiple cracks are frequently initiated in the same area. According to section XI of the ASME Boiler and Pressure Vessel Code, multiple cracks are considered as a single combined crack in crack growth analysis, if the specified conditions are satisfied. In crack growth processes, however, no prescription for the interference between multiple cracks is given in this code. The JSME Post-Construction Code, issued in May 2000, prescribes the conditions of crack coalescence in the crack growth process. This study aimed to extend this prescription to more general cases. A simulation model was applied, to simulate the crack growth process, taking into account the interference between two cracks. This model made it possible to analyze multiple crack growth behaviors for many cases (e. g. different relative position and length) that could not be studied by experiment only. Based on these analyses, a new crack growth analysis method was suggested for taking into account the interference between multiple cracks.
01 Jul 2003
TL;DR: In this article, the authors used constant extension rate tensile experiments in either deaerated or non-deaerated supercritical water at 500 or 550degC to determine the corrosion and stress corrosion cracking (SCC) behavior of austenitic alloys for potential use as structural materials in the super critical water reactor concept.
Abstract: The purpose of this study is to determine the corrosion and stress corrosion cracking (SCC) behavior of austenitic alloys for potential use as structural materials in the supercritical water reactor concept. SCC of 304L and 316L stainless steels was investigated using constant extension rate tensile experiments in either deaerated or non-deaerated supercritical water at 500 or 550degC. Corrosion experiments on heated tubes were conducted on 316L and Inconel 625 in high purity, non-deaerated water between 300 and 500degC. Results reveal that 304L is susceptible to intergranular SCC in 550degC non-deaerated water and, to a lesser extent, in 500degC deaerated water. The 316L sample failed by ductile rupture after 35% strain in 500degC deaerated water. Oxides formed on the SCC samples varied in thickness from {approx}5 microns in non-deaerated water to 1.5-2 microns in deaerated water. The oxides were predominantly iron oxides with a significant amount of chromium oxides. The probable form of the oxides are FeO and Fe(OH){sub 3} and Cr{sub 2}O{sub 3}, Cr(OH){sub 3}, or CrOOH. In corrosion tests, the weight gain of 316L increases by a factor of three between 300degC and 500degC, with an oxide thickness of 5 microns after 8 days at 500degC. The oxide development in 625 is less than that in 316L. (author)
TL;DR: In this article, the performance of three microstructures, i.e., ferritic-pearlitic microstructure, ultrafine ferrite microstructures, and acicular ferrite dominated microstructure, was investigated using the bent-beam test in aqueous hydrogen sulfide (H2S) environments, and the critical stress values of these three microstures were determined experimentally to be 1008, 1190, and more than 1260 MPa.
Abstract: Sulfide stress cracking (SSC) behavior of three microstructures, i.e., ferritic-pearlitic microstructure, ultrafine ferrite microstructure, and acicular ferrite dominated microstructure, was investigated using the bent-beam test in aqueous hydrogen sulfide (H2S) environments. The critical stress (Sc) values of these three microstructures were determined experimentally to be 1008, 1190, and more than 1260 MPa, respectively. As a result, the acicular ferrite-dominated microstructure possessed the best SSC resistance, the ultrafine ferrite microstructure was in a second position, and the ferritic-pearlitic microstructure was relatively the worst. It was analyzed that hydrogen embrittlement (HE) was the main failure mechanism in SSC cracking for high-strength pipeline steels, and preferential hydrogen accumulation within the plastic zone of the main crack tip accounted for the exhibited embrittlement. It was remarkable that the strength values of pipeline steels were not the only factor to determine their SSC susceptibilities. Microstructure played an important role in the SSC initiation and propagation of pipeline steels. In particular, both the fine dispersed precipitations of carbonitrides and the high-density tangled dislocations in acicular ferrite, which behaved as the hydrogen traps, should be attributed to the optimal SSC resistance of pipeline steels.
TL;DR: A detailed examination of the fracture surfaces in an attempt to understand the SCC fracture mechanism was presented in this paper. But the results of the analysis were limited to the fracture surface of a single bolt.
Abstract: Rock bolts have failed by Stress Corrosion Cracking (SCC). This paper presents a detailed examination of the fracture surfaces in an attempt to understand the SCC fracture mechanism. The SCC fracture surfaces, studied using Scanning Electron Microscopy (SEM), contained the following different surfaces: Tearing Topography Surface (TTS), Corrugated Irregular Surface (CIS) and Micro Void Coalescence (MVC). TTS was characterised by a ridge pattern independent of the pearlite microstructure, but having a spacing only slightly coarser than the pearlite spacing. CIS was characterised as porous irregular corrugated surfaces joined by rough slopes. MVC found in the studied rock bolts was different to that in samples failed in a pure ductile manner. The MVC observed in rock bolts was more flat and regular than the pure MVC, being attributed to hydrogen embrittling the ductile material near the crack tip. The interface between the different fracture surfaces revealed no evidence of a third mechanism involved in the transition between fracture mechanisms. The microstructure had no effect on the diffusion of hydrogen nor on the fracture mechanisms. The following SCC mechanism is consistent with the fracture surfaces. Hydrogen diffused into the material, reaching a critical concentration level. The thus embrittled material allowed a crack to propagate through the brittle region. The crack was arrested once it propagated outside the brittle region. Once the new crack was formed, corrosion reactions started producing hydrogen that diffused into the material once again.
TL;DR: In this paper, a 17-4 PH precipitation hardening stainless steel propeller shaft failed in use when installed in a sailboat working in a marine environment and the failure was caused by torsional fatigue and stress corrosion cracking (SCC).
TL;DR: A critical review of the literature has been undertaken to establish the current state of knowledge and understanding of the corrosion and stress corrosion cracking (SCC) of 13 wt-Cr martensitic stainless steels for applications in the oil and gas industry as mentioned in this paper.
Abstract: A critical review of the literature has been undertaken to establish the current state of knowledge and understanding of the corrosion and stress corrosion cracking (SCC) of 13 wt-%Cr martensitic stainless steels for applications in the oil and gas industry. Corrosion data for 13%Cr martensitic stainless steels are critically evaluated to establish the conditions in which the various steels are in the active state, pitting or passive state. There is evidence that as welded specimens have poorer pitting resistance at ambient temperatures than at elevated temperatures owing to the formation of an oxidised layer, perhaps depleted in chromium. Data for hydrogen uptake and diffusivity in 13%Cr steels are reviewed. The results suggest that incorporation of Mo in the steel reduces the subsurface hydrogen content when the steel is in the active state, suggesting repressed dissolution kinetics. The data in the literature on SCC of modified 13%Cr steels indicate that increasing the temperature at pH values ...
TL;DR: In this paper, a constant deflection device designed for use within a transmission electron microscope (TEM) was used to investigate the change in dislocation configuration ahead of a crack tip during stress corrosion cracking, and the initiation of stress corrosion microcracking.
TL;DR: In this paper, an analytical transmission microscopy has been used to investigate the initiation of stress corrosion cracking in Inconel 600 subjected to constant load testing under simulated pressured water reactor primary water conditions.
Abstract: Analytical transmission microscopy has been used to investigate the initiation of stress corrosion cracking in Inconel 600 subjected to constant load testing under simulated pressured water reactor primary water conditions. The observations revealed that intergranular attack proceeded by the development of a zone of polycrystalline chromia along the boundary plane intersecting either the free surface or a blunted, open crack in contact with the free surface. Ni-rich metal particles were interspersed within the chromia. Conversely, open cracks were filled with nanocrystalline NiO and large compound particles of spinel and NiO, indicating a difference in potential between closed, attacked boundaries and open cracks. Open cracks appeared to have initiated by fracture of the chromia zones, such fracture being strongly dependent on boundary geometry with respect to loading direction. The observations suggest that stress corrosion crack initiation and propagation is dependent on diffusion of oxygen thro...
TL;DR: Titanium resists seawater and brine at temperatures as high as 260°C, and is also resistant to corrosion by sulphur dioxide; hydrogen sulphide; and aqueous solutions of those gases.
TL;DR: In this article, stress corrosion experiments were performed on unidirectional ECR-glass/polymer composites with the modified polyester, epoxy and vinyl ester resins for the use in high voltage composite insulator applications.
Abstract: Stress corrosion experiments were performed on unidirectional ECR-glass/polymer composites with the modified polyester, epoxy and vinyl ester resins for the use in high voltage composite insulator applications. Two types of ECR-glass fibers were investigated with low and high counts of gaseous inclusions (seeds) within the glass. The stress corrosion tests were performed in nitric acid under four point bending conditions and the resistance to stress corrosion cracking (SCC) of the composites was determined for as-supplied and sandblasted surface conditions. In addition, the materials were analyzed for their micro-hardness and surface fiber exposure. The resistance to SCC of the ECR-glass/polymer composites was compared with that of the E-glass/polymer systems. It has been found that the ECR-glass fiber composites vastly out-perform their E-glass counterparts regarding their resistance to SCC in nitric acid. The stress corrosion data presented in this work should help composite insulator manufacturers in the selection of composite rod materials with substantially increased resistance to SCC to lower the number of brittle fracture failures among their products.
TL;DR: In this article, the role of multistep aging on the stress corrosion cracking behavior of aluminum alloy 7010 has been investigated, where the material in the form of 5mm-thick sheets was heat-treated to...
Abstract: The role of multistep aging on the stress corrosion cracking (SCC) behavior of aluminum alloy 7010 has been investigated. The material in the form of 5-mm-thick sheets was heat-treated to ...
TL;DR: In this paper, the effect of applied potential and tensile stresses on the stress corrosion cracking behavior of type 304L stainless steel (SS) immersed in 0.5 M NaCl solution of room temperature has been examined.
TL;DR: The influence of changes in chemical composition and pre-aging deformation on the resistance to stress corrosion cracking in the age-hardenable aluminum alloy 2519 was investigated by transmission electron microscopy.
TL;DR: In this article, the fate of the coupling current generated during stress corrosion cracking of sensitized Type 304 stainless steel (304SS) in thiosulfate solution at ambient temperature was explored.
TL;DR: In this paper, the authors proposed to add very minor amounts of platinum group metals (PGMs) to titanium and its alloys, while imparting little or no effect on alloy mechanical/physical properties or metallurgy.
Abstract: Although recognized for their exceptional corrosion resistance in a wide range of chemical environments, titanium and its alloys can be susceptible to corrosion in reducing acid media, crevice attack in hot chlorides and other halide solutions, and/or stress corrosion in certain higher-strength alloys. These serious limitations may be practically and cost-effectively overcome to a great extent by the addition of very minor (<0.25 wt%) amounts of platinum group metals (PGMs) to titanium and its alloys; while imparting little or no effect on alloy mechanical/physical properties or metallurgy. Through the catalytic facilitation of cathodic reduction reactions (primarily the hydrogen evolution reaction [HER]) in acidic aqueous media, these PGM alloy additions shift titanium toward noble (positive) potentials where the protective titanium oxide surface film is stable. This radically decreases alloy corrosion rates in dilute inorganic and organic acids with no detrimental influence in oxidizing media o...
TL;DR: In this article, the authors determined whether grain boundary deformation plays a direct role in intergranular stress corrosion cracking (IGSCC) of Ni-16Cr-9Fe in high-temperature environments.
Abstract: The objective of this research was to determine whether grain boundary deformation plays a direct role in intergranular stress corrosion cracking (IGSCC) of Ni-16Cr-9Fe in high-temperature...
15 Apr 2003-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the authors measured the film-induced tensile stress and susceptibility to stress corrosion cracking (SCC) in the methanol solution at various potentials at stable open-circuit potential and under anodic polarization.
Abstract: The flow stress of a specimen of α-Ti before unloading is different with the yield stress of the same specimen after unloading and forming a passive film through immersing in a methanol solution at various constant potentials. The difference is the passive film-induced stress. The film-induced stress and susceptibility to stress corrosion cracking (SCC) in the methanol solution at various potentials were measured. At the stable open-circuit potential and under anodic polarization, both film-induced tensile stress σ p and susceptibility to SCC had a maximum value. The film-induced stress and SCC susceptibility, however, decreased steeply with a decrease in potential under cathodic polarization. When the potential V ≤−280 mV SCE , the film-induced stress became compressive; correspondingly, susceptibility to SCC was zero. Therefore, the variation of film-induced stress with potential was consistent with that of susceptibility to SCC. A large film-induced tensile stress is the necessary condition for SCC of α-Ti in the methanol solution. The symbol and amount of the film-induced stress were related to the compositions of the passive film, which have been analyzed using the X-ray photoelectron spectrum (XPS).