低合金鋼X70和3Cr在超臨界CO2環(huán)境中的縫隙腐蝕

低合金鋼X70和3Cr在超臨界CO2環(huán)境中的縫隙腐蝕Crevice corrosion of 3Cr and X70 low alloy steels under supercritical CO2 condition

利用浸泡實驗?zāi)M了低合金鋼X70和3Cr在超臨界CO2環(huán)境下的縫隙腐蝕, 運(yùn)用失重分析和表面分析研究其腐蝕行為. 縫隙內(nèi)部與外部之間形成濃差電池導(dǎo)致了在縫隙口產(chǎn)生了嚴(yán)重的反縫隙腐蝕, 即在縫隙口處腐蝕嚴(yán)重而縫隙內(nèi)部腐蝕輕微. 在超臨界CO2環(huán)境中, 3Cr鋼的耐均勻腐蝕性能優(yōu)于X70鋼, 而耐局部腐蝕性能則劣于X70鋼. 合金元素Cr和Cu對低合金鋼耐腐蝕性能的協(xié)同作用導(dǎo)致了3Cr鋼和X70鋼的不同的縫隙腐蝕行為.

The crevice corrosion behavior of 3Cr and X70 low alloy steels under supercritical CO2 condition was investigated by immersion tests, surface analysis and gravimetric analysis. Due to the galvanic effect of areas inside and outside the crevice, a reverse crevice corrosion was triggered, with slight corrosion inside the crevice but severe corrosion at its edge. In acid environment, 3Cr steel exhibited a higher uniform corrosion resistance than X70 steel, while the crevice corrosion resistance was adverse for the two steels. The different crevice corrosion behavior between X70 and 3Cr steel might be attributed to the synergistic effect of elements Cr and Cu on enhancing the crevice corrosion.

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