冷作变形量对Super304H不锈钢耐蚀性能的影响
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摘要
Super304H奥氏体不锈钢性能优异,应用广泛,但目前鲜见其冷作变形后腐蚀行为的研究报道。采用化学浸泡法、电化学方法、能谱分析等研究了冷作变形量对Super304H奥氏体不锈钢耐蚀性能的影响。结果表明:在6%FeCl3+0.05 mol/L HCl混合溶液中,随着变形量的增加,Super304H不锈钢的腐蚀速率先降低后增加,变形量为15%时,腐蚀速率最低;在25℃,3.5%NaCl溶液中,随着变形量的不断增大,Super304H不锈钢耐蚀性能先增强后减弱,变形量为15%时,交流阻抗谱阻抗值最大,耐点蚀性能最好;在55℃,3.5%NaCl溶液和25℃,3.5%NaCl+2.0%H2SO4溶液中,随着变形量的不断增大,耐蚀性能先增强后减小,变形量为18%时,阻抗值最大,Super304H不锈钢耐点蚀性能最好;在6%FeCl3+0.5 mol/L HCl混合溶液中,Super304H不锈钢点蚀孔周围Fe和Ni的含量比远离蚀孔区域的低,腐蚀产物以Fe_2O_3为主。
The effect of cold deformation on corrosion resistance of super 304 H stainless steel was studied by chemical immersion method,electrochemical test and EDS. Results showed that: in 6% Fe Cl3+0.05 mol/L HCl mixed solution,the corrosion rate of super 304 H stainless steel decreased firstly and then increased with the increase of the deformation,and reached the lowest value when the deformation was 15%. With the increase of deformation,the corrosion resistance increased firstly and then decreased in 3.5% Na Cl solution at 25 ℃ and when the deformation was 15%,the impedance value reached the maximum and the stainless steel had the best pitting corrosion resistance. In 3.5% Na Cl solution at55 ℃ and in 3. 5% NaCl + 2. 0% H_2SO_4 solution at 25 ℃,the corrosion resistance had the similar changing trend: first increased and then decreased,and the impedance reached the maximum value when the deformation was 18%,presenting the best pitting corrosion resistance.Besides,in 6%FeCl3+0.5 mol/L HCl solution,the contents of Fe and Ni around the pitting holes were much lower than those at the remote areas,and Fe_2O_3 was the main corrosion product.
The effect of cold deformation on corrosion resistance of super 304 H stainless steel was studied by chemical immersion method,electrochemical test and EDS. Results showed that: in 6% Fe Cl3+0.05 mol/L HCl mixed solution,the corrosion rate of super 304 H stainless steel decreased firstly and then increased with the increase of the deformation,and reached the lowest value when the deformation was 15%. With the increase of deformation,the corrosion resistance increased firstly and then decreased in 3.5% Na Cl solution at 25 ℃ and when the deformation was 15%,the impedance value reached the maximum and the stainless steel had the best pitting corrosion resistance. In 3.5% Na Cl solution at55 ℃ and in 3. 5% NaCl + 2. 0% H_2SO_4 solution at 25 ℃,the corrosion resistance had the similar changing trend: first increased and then decreased,and the impedance reached the maximum value when the deformation was 18%,presenting the best pitting corrosion resistance.Besides,in 6%FeCl3+0.5 mol/L HCl solution,the contents of Fe and Ni around the pitting holes were much lower than those at the remote areas,and Fe_2O_3 was the main corrosion product.
引文
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