Mechanical surface treatments effects on corrosion of AISI 316 Ti stainless steel in chloride environments
29 Sep 2014-The Journal of Engineering Research (Academic Publication Council)-Vol. 2, Iss: 3, pp 1-17
TL;DR: In this paper, the effects of various surface treatment techniques such as grinding, garnet blasting, and shot peening on the corrosion rate and behavior of austenite stainless steel of type AISI 316 Ti were investigated using immersion tests and electrochemical impedance spectroscopy together with opticalscanning electron microscopy.
Abstract: The current paper investigates effects of various surface treatment techniques suchas grinding, garnet blasting, and shot peening on the corrosion rate and behaviorof austenite stainless steel of type AISI 316 Ti. The exposure to different corrosivesolutions usually accompanying the coastal and industrial environments (sodiumchloride and ferric chloride), as well as a combination of the two was considered. Thecorrosion behavior of AISI 316 Ti under these test conditions was investigated usingimmersion tests and electrochemical impedance spectroscopy together with opticalscanning electron microscopy, in order to observe and to assess the changes in thesurface configuration and topography such the shapes, distribution, and dimensionsof the resulting pits. The presented results clearly show the relatively higher corrosiveeffect of ferric chloride, and the increased corrosion rate under greater surfaceroughness values, which imply greater real surface area and capillarity effects.
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TL;DR: The main interest of as mentioned in this paper is to focus on corrosion properties of the AISI 316Ti stainless steel treated by shot peening and pickling and analyze the corrosion behavior of the material in question.
Abstract: Surface conditions of materials affect the chemical, physical and mechanical properties of stainless steels. The main interest of this paper is to focus on corrosion properties of the AISI 316Ti stainless steel treated by shot peening and shot peening and pickling. In the last years shot peening has been widely used as a method improving fatigue properties of components under cyclical load. Because surface finishing has strong effect on corrosion susceptibility of stainless steels, e. g. pitting and created pits can initialize cracks, it is important to analyse corrosion behaviour of the material in question. In this study, the tested surfaces were characterized by SEM, EDX analyses, measurement of surface free energy and roughness. Corrosion properties were investigated in various environments by exposure, potentiodynamic cyclic and EIS tests.
4 citations
Cites background from "Mechanical surface treatments effec..."
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TL;DR: In this paper, the use of waste plastic as modifier for aggregates (plastic coating aggregate) was investigated and the test results had demonstrated that there was an improvement in the properties of plastic coated aggregates.
Abstract: Rapid growth of plastics industries in Asia's emerging markets particularly in Malaysia, in one way, it raised expectations for everyday comforts, in the other way it also causes environmental issues. Plastic bottle for recycling can be found from the household waste stream, and most of them are made from Polyethylene Terephthalate (PET). Recycling this plastic into another form might be one of the cheapest and rapid solutions. However, turning this plastic into some other usable form uses energy and this may not become a green waste management solution. In this research, PET is utilized to explore its potential prospects to upgrade asphalt mixture properties. This study investigates the use of waste plastic as modifier for aggregates (plastic coating aggregate). The type of plastic used in this study was waste PET plastic bottle. The shredded waste PET plastic (size 0.075mm to 1.18mm) was mixed with hot aggregate to form a thin layer on the surface of the aggregates. The properties of modified aggregate and unmodified aggregate was tested and compared. 1% and 2% of plastic by weight of aggregate were used to coat the aggregate. The plastic-coated aggregates are tested for impact value and crushing value. The test results had demonstrated that there was an improvement in the properties of plastic coated aggregates.
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31 Jan 2020
TL;DR: In this paper, an analysis of Impressed CurrentCathodic Protection (ICCP) design of the underwater structure of KRI using computative theory calculation andspecimen test is presented.
Abstract: In carrying out these basic tasks the Navy relies heavily on the readiness of the Indonesian Warship (KRI),including the readiness of underwater construction in KRI from corrosion attack on sea water. Nowadays, KRIuses Sacrificial Anode Cathodic Protection (SACP) from corrosion attack. Whereas, SACP system has someweakness, such as the lifetime protection is short. The aim of this paper is to the analysis of Impressed CurrentCathodic Protection (ICCP) design of the underwater structure of KRI using computative theory calculation andspecimen test. The results of ICCP design showed that the specimens I required 0.081 Ampere (A) forprotection current, specimen 2 required 0.010 A for protection current, specimens 3 required 0.00251 A. Withpotential protection between -800 mV up to -1100 mV, it described that the ICCP system is reasonable. Theresult of cathodic protection design towards an underwater structure of KRI (TR-40 Type) showed that 1.75 forAmpere (A) and 3.35 volt DC for voltage. The benefit of this paper is a reference standard in the planning of theICCP design at KRI.Keywords: Corrosion, Underwater Structure of Warship, Impressed Current Cathodic Protection (ICCP).
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References
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TL;DR: In this article, a nanocrystalline 316L austenitic stainless steel sample (mean grain size similar to 40 nm) was prepared by means of surface mechanical attrition treatment, which exhibited an extremely high yield strength up to 1450 MPa, which still follows the Hall-Petch relation extrapolated from the coarse-grained material.
Abstract: A nanocrystalline 316L austenitic stainless steel sample (mean grain size similar to 40 nm) was prepared by means of surface mechanical attrition treatment. Uniaxial tensile tests at room temperature showed the nanocrystalline sample exhibits an extremely high yield strength up to 1450 MPa, which still follows the Hall-Petch relation extrapolated from the coarse-grained material. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
335 citations
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TL;DR: In this article, the analysis for determining surface free energy uncertainty by the Owens-Wendt method is presented, which is also known as the Kaelble-Owens-Wilson (KOW) method.
Abstract: This article presents the analysis for determining surface free energy uncertainty by the Owens–Wendt method (also known as the Kaelble–Owens–Wendt method). There are a lot of factors which have a substantial influence on the correctness of the contact angle measuring process. If a full measurement result is to be obtained, assessment of the result reliability is needed. In the case of distilled water wetting angle measurements, dispersion of the results may be assumed as a normal dispersion (according to the χ2 test). In contrast, in the case of diiodomethane wetting angle measurements, dispersion of results cannot be treated as normal dispersion. This may demonstrate that if numerous factors are analysed, usually there is one dominant factor—in this case, a drop of liquid. The uncertainty resulting from different quantities of constants, given in the literature, is of great importance in the standard uncertainty overall error, both for the total surface energy and for its polar and dispersive components. Thus, it cannot be neglected at the examination reliability assessment.
243 citations
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15 Aug 2006-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: The peak subsurface compressive residual stress produced by sandblasting was measured by XRD to be around 480 MPa as mentioned in this paper, and three distinct regions were observed in the sandblasted samples, namely severely deformed surface layer, the region deformed mainly by twinning, and the substrate.
Abstract: Commercially pure titanium was sandblasted with SiO2 particles of 200–300 μm in diameter. It was found that the sandblasted samples exhibited an increase in fatigue strength by 11% over that of the untreated samples. The peak subsurface compressive residual stress produced by sandblasting was measured by XRD to be around 480 MPa. Three distinct regions were observed in the sandblasted samples, namely the severely deformed surface layer, the region deformed mainly by twinning, and the substrate. After recovery treatment below 300 °C, the surface layer of the sandblasted samples was transformed into a nano-crystalline structure, and its corrosion resistance was significantly improved.
160 citations
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TL;DR: In this article, an electrophoretic deposition at various deposition potentials from 30 to 90 V using the stoichiometric HAP (Ca/P ratio 1.67) powder in a suspension of isopropyl alcohol was developed on type 316L stainless steel.
Abstract: Hydroxyapatite (HAP) coatings were developed on type 316L stainless steel (SS) by electrophoretic deposition at various deposition potentials from 30 to 90 V using the stoichiometric HAP (Ca/P ratio 1.67) powder in a suspension of isopropyl alcohol. The optimum coating parameters were established at 60 V and 3 min, after vacuum sintering at 800 C. The phase purity of the coated surface was confirmed by XRD and secondary ion mass spectrometry confirmed the presence of both Ca and P on the coated layers. The electrochemical corrosion parameters Ecorr (open circuit potential) and pitting potentials, evaluated in Hank’s solution shifted towards noble direction for the HAP coated specimens in comparison with uncoated type 316L SS. Electrochemical impedance spectroscopic investigations revealed higher polarisation resistance and lower capacitance values after immersing the coated specimens in Hanks solution for 200 h. This indicates the stable nature of the coatings formed. 2002 Elsevier Science Ltd. All rights reserved.
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