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本文用慢应变速率实验(SSRT)方法研究了奥氏体304不锈钢在室温酸性氯化物溶液中的应力腐蚀开裂(SCC)敏感性。H~+和Cl~-浓度是影响该体系发生SCC的两个重要因素,对SCC敏感的H~+浓度范围为:0.01-1.2M,溶液中H~+浓度的改变,可使材料的腐蚀形态发生显著变化;Cl~-浓度的增加,可以提高溶液中H~+的活性;H~+和Cl~-对该体系发生SCC既有竞争作用又有协同作用。最后给出了“304不锈钢/HCl+NaCI”体系发生SCC的介质条件,即:“[Cl~-]-[H~+]-SCC图”。
In this paper, the stress corrosion cracking (SCC) sensitivity of austenitic 304 stainless steel in acidic chloride solution at room temperature was studied by slow strain rate test (SSRT). H ~ + and Cl ~ - are the two important factors that affect SCC in this system. The concentration of H ~ + sensitive to SCC ranged from 0.01 to 1.2M. The change of H ~ + concentration in solution could cause corrosion of the material The change of H_ ~ + and Cl ~ - increased the concentration of Cl ~ -, and increased the activity of H ~ + in solution. H ~ + and Cl ~ - both had a competitive and synergistic effect on SCC. Finally, the medium condition of SCC in “304 stainless steel / HCl + NaCI” system is given, ie “[Cl ~ -] - [H ~ +] - SCC”.