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首页> 外文期刊>Corrosion: The Journal of Science and Engineering >Effect of Sulfur Content of Copper-Containing Austenitic Stainless Steels on Corrosion Behavior in Concentrated Sulfuric Acid-Part 2
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Effect of Sulfur Content of Copper-Containing Austenitic Stainless Steels on Corrosion Behavior in Concentrated Sulfuric Acid-Part 2

机译：Effect of Sulfur Content of Copper-Containing Austenitic Stainless Steels on Corrosion Behavior in Concentrated Sulfuric Acid-Part 2

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摘要

The effects of S addition on the corrosion behavior of Cu-containing austenitic stainless steel in 18.4 N sulfuric acid (H_2SO_4) at 80 deg C to 120 deg C were investigated using polarization testing, immersion testing, metallographic examination, x-ray photoelectron spectroscopy (XPS), and scanning Auger multi-probe (SAM) analysis. The addition of 0.091percent S in the experimental alloy containing 3.1percent Cu slightly decreased the general and pitting corrosion resistance in highly concentrated H_2SO_4 compared to that of the 3.2percent Cu and 0.007percent S-added alloy. The suggested primary reason for this result was the protective surface film that was heavily enriched with the noble metallic Cu and cupric oxide (CuO) from the selective dissolution of the active metallic Fe, Ni, and Cr. The effect of Cu enrichment was much stronger in the Cu- and S-added alloy than that in the Cu added alloy without S. In addition, the corrosion resistance seemed to be associated with the corrosion-resistant species of molybdenum dioxide (MoO_2), tungsten trioxide (WO_3), molybdenum oxy-hydroxide (MoOOH_2), molybdate (MoO_4~(2-)), tungstate (WO_4~(2-)), and chromate (CrO_4~(2-)) contained in the protective surface film. The stainless steel with 3.1percent Cu and 0.091percent S and a base composition of 18percentCr-21percentNi-3.2percentMo-1.6percentW-0.2percentN-0.034percentC showed a noticeably better corrosion resistance than commercial super austenitic stainless steels such as UNS S32654 and as good as Ni-based alloy such as CW12MW in a highly concentrated sul-fate (SO_4~(2-)) environment

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