Or simply go through the following pages with links to the relevant articles
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Life expectancy is estimated from pitting depth measurements made on exposed test samples. The results depend on steel grade, environment and surface finish. Staining from micro pitting may result in rejection of the steel on aesthetic grounds, long before pitting has perforated it. Steel types 430, (ferritic), 304 and 316, (austenitic) are considered. (104)
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John Swain of Anopol explains the benefits of electropolishing on complex shapes.
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The process used for electropolishing is outlined, (anodic dissolution in phosphoric / sulphuric acid electrolytes). The benefits of electropolished finishes are summarised and a list of typical application industries and specific products given. Safety issues are briefly noted and the need to employ the services of competent specialists for electropolishing is stressed. Electropolished surfaces should be fully passive and no further passivation treatments are necessary.
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The main factor in the selection process for stainless steels is corrosion resistance. Careful consideration of the application should be done to enable a choice of grade with suitable corrosion resistance whilst keeping costs to an economic minimum. Other considerations such as mechanical properties, (strength and toughness), physical properties, (magnetic permeability), and forming, fabrication and joining methods available should be secondary. (91)
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Stainless steel is a great material to work with. As with all materials you need to know how to treat it correctly for maximum cost effectiveness. This article summarises the typical pitfalls and remedies.
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A colour chart is shown for guidance on exposure temperatures on 1.4301, (304), type. The factors affecting the degree or depth of colours formed are outlined. These include steel composition, atmosphere, time and surface finish.
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The effect of the surface finish on the corrosion resistance of stainless steel. This paper clearly shows the importance of polishing medium and surface profile on the corrosion resistance of stainless steel in both real and test cases. The development of the EN 10088-2 2K finish is described. This paper is of particular importance in the correct specification of architectural features where cosmetic appearance is a dominant factor.
Note. This paper is not intended to imply that the silicon carbide finish is the optimum for corrosion resistance. The smoothest surface possible, bright polished, always provides the best corrosion resistance in any environment.
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Rust staining can occur and has been reported as anything from a slight brown ‘bloom’ on the surface to severe surface pitting or rusty scour marks on items such as handrails. These effects are usually due to surface contamination from contact with non-stainless steel items. Iron contamination can be costly to remedy, and is avoidable. The ferroxyl test can be used to detect ‘free’ iron contamination. (108)
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This article describes the practical issues surrounding the definition of surface finishes on stainless steel. It provides guidance on how to agree a suitable surface finish between the end user and supplier. The author has many years of experience in this field.
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The combination of surface preparation and formulation of the paint system are key factors in the successful paint coating, (painting), of stainless steels. Surface preparation and coating (primer and top coat) application and systems are discussed.
