Showing papers in "Corrosion Science in 1992"

TL;DR: In this paper, the oxide phases formed on NiAl and NiAl-Cr and their oxidation kinetics have been studied in the temperature range 973-1673 K using TGA, XRD, SEM and TEM.

TL;DR: In this paper, the effects of dilute sulphate on metastable and stable pitting of 304 stainless steel in chloride solution have been studied, showing that the presence of sulphate causes the distribution of available pit sites to be shifted to a higher potential, implying that pit nucleation is inhibited.

TL;DR: In this article, the authors used two high purity model alloys, one of which was doped with sulphur, and laser surface melting of the alloys to detect and follow the evolution of anodic current transients (unstable micropits).

TL;DR: In this article, the surface compositions of two NiCrFe alloys have been characterized by angle-resolved ESCA, after polarization in the passive state or in the active state in 0.05 M H2SO4.

TL;DR: In this paper, the electrochemical behavior of aluminium in 0.1 M hydrochloric acid solution positive of the open circuit potential (OCP) was studied using open-circuit potential measurements, linear sweep voltammetry and electrochemical impedance spectroscopy at stationary and rotating high purity aluminium disc electrodes.

TL;DR: In this paper, a cooperative absorption model between chloride electroactive species and organic cations was proposed to explain the inhibition mechanism of n-hexadecyl derivatives of pyridine (P), quinoline (Q) and acridine (A) inhibitors with Fe and steel surfaces.

TL;DR: The framework and associated interpretive process assist those doing a diagnosis in applying two powerful bodies of knowledge to failure diagnosis — socio-technical systems and interpretive methods.

TL;DR: In this paper, the corrosion inhibition of iron in acid chloride solution offered by a new class of polymer-ortho substituted poly ethoxy aniline, a conducting polymer has been studied.

TL;DR: In this paper, the effect of chloride concentration, pH, dissolved oxygen and temperature on the pitting behavior of 316L stainless steel in aqueous solutions has been investigated under dynamic and static conditions.

TL;DR: The ability of the γ-TiAl alloys to form a protective alumina scale on oxidation was found to be much influenced by the presence of low concentrations of other elements, binary combinations of which were often more effective in promoting oxidationresistance than single element additions as discussed by the authors.

TL;DR: In this article, the inhibitive action of some series of organic compounds against the corrosion of four steels, with increasing Cr content, has been studied, and the results showed that the N-containing compounds exerted the same inhibitive effect on all the steels.

TL;DR: In this paper, Raman microscopy has been used to measure stress variations in a-Cr2O3 scale as it formed at 800°C on chromium metal and showed that compressive stress at the centre of grains is relieved at grain boundaries.

TL;DR: In this paper, the effects of macrocells formed between active (depassivated) and passive areas on the corrosion rate of steel reinforcements in concrete beams and slabs are studied. And a reasonable concordance is obtained between the theoretical predictions and the experimental data.

TL;DR: In this article, the morphology and structure of the chemical conversion coating developed on aluminium in an acid chromate/fluoride solution have been examined by transmission electron microscopy of stripped films and ultramicrotomed sections.

TL;DR: In this article, a mathematical model of the evolution of solution chemistry and electrostatic potential within a passive crevice in a metal is presented to simulate the early stages of crevice corrosion, leading to the breakdown of the passive film and local activation of the metal.

TL;DR: The influence of K+, Mg2+, Ba2+, Cu2+, Zn2+, Hg2++, Cd2+, Co2+, Ni2+ or Fe3+ on the general and pitting corrosion of aluminium in neutral and acid media has been determined by gravimetric, potentiodynamic polarization and thermometric measurements together with surface analysis by XPS, Auger profile depth analysis and examination by SEM as mentioned in this paper.

TL;DR: In this paper, the authors measured the corrosion rate of carbon steel by monocultures and various combinations of aerobic ( Bacillus sp.), fermentative ( Hafnia alvei ) and sulfate-reducing ( Desulfovibrio gigas ) bacterial biofilms in an aerobic, continuously flowing freshwater reactor containing 0.4 mM sulfate.

TL;DR: In this paper, the composition and structure of the film formed on copper by exposure to ambient air for 24 h were investigated by X-ray photo-electron spectroscopy (XPS).

TL;DR: In this article, XPS and electrochemical investigations reveal that molybdenum and tungsten prevent dissolution of chromium from the air-formed films during potentiostatic passivation.

TL;DR: The initial stages of pit growth for stainless steel exposed in 05 M H 2 SO 4 + 05 M NaCl + 008% H 2 O 2 at the free corrosion potential for 10 s have been examined by Auger and simultaneous EDX mapping and electron microscopy as mentioned in this paper.

TL;DR: The depth and the amount of anion incorporation into the cell walls of porous anodic films formed in a phosphoric acid solution have been studied using TEM and EDX.

TL;DR: In this article, a mechanism for the pitting corrosion of Al alloys is proposed based on the literature data and the current results, where the assumption is made that the transport of Cl− ions through defects in the passive film of aluminum and aluminum alloys was not a rate determining step in pitting, and the pit development is controlled by the solubility of the oxidized alloying elements in acid solutions.

TL;DR: The inhibitor effect of amino acids on the corrosion of nickel in sulphuric acid medium was investigated in this paper, where thirteen amino acids with different properties were used to determine the corrosion current densities.

TL;DR: In this paper, the pitting initiation behavior of hydrogen-charged passive films on pure iron in 0.15 Na2B4O7-0.15 N H3BO4 solution of pH = 8.4 at 30°C has been investigated by using gas-phase hydrogen charging and an electrochemical detection technique.

TL;DR: An accelerated corrosion test for polymer coatings based on electrochemical impedance spectroscopy (EIS) and a model for the impedance of polymer coated samples with an artificial defect have been developed to evaluate the quality of coatings and to predict the lifetime of coated metals in a short time as discussed by the authors.

TL;DR: In this article, the effects of pre-adsorbed sulphur on the dissolution and the passivation of Fe17Cr12.6Ni (100) and Fe17Cr 14.3Mo (100), alloys in sulphuric acid were studied.

TL;DR: In this paper, the effects of pre-existing sulphide or oxide corrosion products were examined in corrosion tests of low-carbon steel at various sulphide concentrations (06 to 15 mM) in deoxygenated, neutral, buffered NaCl solutions.

TL;DR: In this paper, the effects of storage time, film thickness, and the synergistic effect of temperature (80°C) and relative humidity (85%) on the lifetime of thin polyimide (PI) films on aluminum and iron metallic substrates were investigated.