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选定尾气膨胀机叶轮常用的FV520B钢、17-4 PH钢和Inco 718合金3种材料为研究对象,通过仿工程工况环境法分别对其在T1、T2及T3下的均匀腐蚀和点蚀行为进行研究。结果表明:在T1下,测试腐蚀液浓度范围内,3种材料均表现出良好的耐腐蚀性能,满足工程使用需求。当测试温度为T2时,Inco 718合金在整个腐蚀浓度区间仍表现出优异的耐蚀性,可以满足工程需求;但FV520B钢和17-4PH钢在腐蚀液浓度升高为1.5%时,两者的耐蚀性均发生明显下降;当环境温度进一步升高为T3时,Inco 718合金在整个腐蚀浓度区间仍表现出优异的耐蚀性,但FV520B钢和17-4PH钢的耐腐蚀性能,随混合酸溶液浓度变化,表现出明显的不稳定性,已无法满足工程使用。
Selected three kinds of materials, FV520B steel, 17-4 PH steel and Inco 718 alloy which are commonly used in the impeller of the tail gas expander, were used as the research objects. Through the environmental conditions of imitation engineering conditions, their uniform corrosion and pitting corrosion under T1, T2 and T3 Conduct research. The results show that all three kinds of materials show good corrosion resistance at T1 under the range of the concentration of the test solution to meet the engineering requirements. When the test temperature is T2, the Inco 718 alloy still shows excellent corrosion resistance throughout the corrosion concentration range, which can meet the engineering requirements; however, both the FV520B steel and the 17-4PH steel when the concentration of the etchant is increased to 1.5% The corrosion resistance of Inco 718 alloy still shows excellent corrosion resistance in the entire corrosion concentration range when the ambient temperature is further increased to T3. However, the corrosion resistance of Inco 718 alloy with Mixed acid solution concentration changes, showing obvious instability, has been unable to meet the engineering use.