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51313-02352-Factors Affecting Pitting Corrosion Resistance of Non-Magnetic Stainless Steel Surfaces

Picture for Factors Affecting Pitting Corrosion Resistance of Non-Magnetic Stainless Steel Surfaces
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Product Number: 51313-02352-SG
ISBN: 02352 2013 CP
Author: Helmuth Sarmiento Klapper
Publication Date: 2013
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$20.00
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The spontaneous formation of an ultra-thin semiconducting protective layer confers stainless steel surfaces their outstanding uniform corrosion resistance. Nevertheless depending on the surface condition technical design and environmental factors stainless steels can still be susceptible to localized corrosion. Since the passive layer formed on stainless steel surfaces experiences a permanent changes originating from activation and repassivation events the expected surface corrosion protection depends upon both the factors affecting the passivation process and the passive layer stability during service. Surfaces treatments directly affecting passivity and passive layer stability are commonly applied to non-magnetic stainless steels in order to change their mechanical properties. However a complete understanding about how surface treatments and their limitations affect the corrosion resistance of these materials is still lacking. Therefore surface and electrochemical examinations have been conducted to investigate the influence of different surface treatments usually applied on materials used in the oil and gas industry such as shot peening hammer peening and cold rolling on the pitting corrosion resistance of non-magnetic stainless steels. Experimental results have shown the pitting corrosion potential depends on the achieved surface topography by the surface treatment and being sometime nearly independent of the roughness of the surface. Roughness is not the only fundamental parameter determining the final corrosion resistance of a stainless steel surface. In fact surface treatment parameters can also significantly influence the future corrosion resistance of the stainless steel surface.

Keywords: pitting corrosion stainless steel hammer peening shot peening cold rolling

The spontaneous formation of an ultra-thin semiconducting protective layer confers stainless steel surfaces their outstanding uniform corrosion resistance. Nevertheless depending on the surface condition technical design and environmental factors stainless steels can still be susceptible to localized corrosion. Since the passive layer formed on stainless steel surfaces experiences a permanent changes originating from activation and repassivation events the expected surface corrosion protection depends upon both the factors affecting the passivation process and the passive layer stability during service. Surfaces treatments directly affecting passivity and passive layer stability are commonly applied to non-magnetic stainless steels in order to change their mechanical properties. However a complete understanding about how surface treatments and their limitations affect the corrosion resistance of these materials is still lacking. Therefore surface and electrochemical examinations have been conducted to investigate the influence of different surface treatments usually applied on materials used in the oil and gas industry such as shot peening hammer peening and cold rolling on the pitting corrosion resistance of non-magnetic stainless steels. Experimental results have shown the pitting corrosion potential depends on the achieved surface topography by the surface treatment and being sometime nearly independent of the roughness of the surface. Roughness is not the only fundamental parameter determining the final corrosion resistance of a stainless steel surface. In fact surface treatment parameters can also significantly influence the future corrosion resistance of the stainless steel surface.

Keywords: pitting corrosion stainless steel hammer peening shot peening cold rolling

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