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A marine site and a semi-marine site in the UAE and a rural site in Saudi Arabia were selected in this study. The field test results compare the atmospheric corrosion resistance of eight different stainless steel grades
The environmental condition and the alloying composition of the stainless steel are the most importance factors that affect the atmospheric corrosion resistance of stainless steel. The environment in Middle East is characterized by high temperature and very little rain fall which together with the distance to the sea will have a huge effect on the corrosiveness. The closer the distance is to the sea the higher the corrosivity of the environment has. Selecting suitable stainless steel in different locations in Middle East require knowledge of the actual atmospheric condition at the location of the application. The aim of this paper is to present information about the effect of various environments in Middle East on the atmospheric corrosion of stainless steels after four years exposure. Three different test sites are selected in this study: marine site semi-marine site in Dubai and rural site in Saudi Arabian. The results obtained are used for comparing the atmospheric corrosion resistance of eight different stainless steel grades (two ferritic two austenitic and four duplex grades). The results are analyzed in terms of corrosion performance and appearance rating. The evaluation obtained gives the material ranking and guidance for stainless steel selection under various environments in Middle East.Key word: Stainless steel atmospheric corrosion appearance rating marine environment semi-marine environment rural environment Middle East.
Key words: Stainless steel, atmospheric corrosion, appearance rating, marine environment, semi-marine environment, rural environment, Middle East, chloride ion in soluble deposit
This paper provides an overview of the main properties of duplex stainless steels in terms of chemical composition, mechanical and physical properties. Then, the results of an extensive atmospheric field test program are reported,
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The objective was to compare the effect on corrosion of different field exposure conditions: atmospheric exposure in a medium chloride environment, atmospheric exposure with periodic seawater spray, cyclic alternate immersion, and a typical accelerated atmospheric testing protocol (GM 9540).
Differences between temperate and tropical sites in terms of electrochemical behavior (e.g. open-circuit potential and cathodic current for oxygen reduction). One difference is critical temperature for biofilm ennoblement. Results are discussed in terms of risk for crevice corrosion for stainless steels in tropical seas.