Effects of Environmental Factors on Pitting Corrosion Behavior of 1.4539 Stainless Steel
摘 要
采用浸泡腐蚀试验和电化学试验研究了温度、载荷和Cl-含量对1.4539不锈钢耐点蚀性能的影响。结果表明:介质温度低于50 ℃时,1.4539不锈钢具有良好的耐点蚀性能,介质温度超过50 ℃后,随着温度的升高,点蚀电位迅速降低;当载荷产生的拉应力高于0.54σs时,材料的钝化区消失,阳极曲线转变为活性溶解,且随着拉应力的增大,阳极电流密度迅速增大; 在受Cl-含量和拉伸载荷耦合作用的电化学体系中,当NaCl质量分数不超过5 %,拉伸载荷可明显提高1.4539不锈钢的Cl-腐蚀敏感性,NaCl质量分数不低于7%时,拉伸载荷对1.4539不锈钢的Cl-腐蚀敏感性影响降低。
Abstract
The effects of temperature, load and Cl- concentration on pitting corrosion behavior of 1.4539 stainless steel were investigated by immersion corrosion test and electrochemical test. The results show that the 1.4539 stainless steel had good pitting corrosion resistance when the temperature of medium was less than 50 ℃. But when the temperature was above 50 ℃, the pitting corrosion potential decreased rapidly with the increase of temperature. When the tensile stress generated by applied load was higher than 0.54σs, the passivation zone of the material disappeared, the anodic curves changed to active dissolution, and the anodic current density increased rapidly with the increase of tensile stress. In the electrochemical system coupled with Cl- content and tensile load, when the mass fraction of NaCl was no more than 5%, tensile load could significantly increase the Cl- corrosion sensitivity of the 1.4539 stainless steel; when the mass fraction of NaCl was no less than 7%, the effect of tensile load on the Cl- corrosion sensitivity of the 1.4539 stainless steel reduced.
中图分类号 TG172 DOI 10.11973/fsyfh-202108007
所属栏目 试验研究
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收稿日期 2019/9/19
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引用该论文: ZHANG Dubao,LI Chengtao,FANG Kewei,DONG Shuai,LUO Kunjie,WANG Li,WU Huanchun. Effects of Environmental Factors on Pitting Corrosion Behavior of 1.4539 Stainless Steel[J]. Corrosion & Protection, 2021, 42(8): 40
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参考文献
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【4】MOAYED M H,NEWMAN R C. Deterioration in critical pitting temperature of 904L stainless steel by addition of sulfate ions[J]. Corrosion Science,2006,48(11):3513-3530.
【5】向嵩,曾洪涛,杨阳,等. 浓硫酸中904L不锈钢焊接接头的耐蚀性能[J]. 北京科技大学学报,2014,36(1):69-73.
【6】ABD EL MEGUID E A,ABD EL REHIM S S,AL KIEY S A. Inhibitory effect of cetyltrimethyl ammonium bromide on the corrosion of 904L stainless steel in LiBr solution[J]. Corrosion Engineering,Science and Technology,2016,51(6):429-437.
【7】张艳,李倩,张媛. 904L不锈钢在5 g/L H2SO4溶液中的腐蚀行为[J]. 沈阳工业大学学报,2015,37(2):236-240.
【8】曾洪涛,向嵩,刘松林,等. 904L不锈钢在氢氟酸和浓硫酸混合液中的腐蚀行为[J]. 中国腐蚀与防护学报,2013,33(3):182-187.
【9】王长罡,赵林,伍立坪,等. 几种超级不锈钢在模拟低温多效海水淡化环境中的点蚀行为研究[J]. 腐蚀科学与防护技术,2018,30(4):339-345.
【10】杜楠,叶超,田文明,等. 304不锈钢点蚀行为的电化学阻抗谱研究[J]. 材料工程,2014,42(6):68-73.
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【12】KIM S J. Effect of the elastic tensile load on the electrochemical corrosion behavior and diffusible hydrogen content of ferritic steel in acidic environment[J]. International Journal of Hydrogen Energy,2017,42(30):19367-19375.
【13】LV G C,XU C C,LV Y M,et al. The enrichment of chloride anion in the occluded cell and its effect on stress corrosion crack of 304 stainless steel in low chloride concentration solution[J]. Chinese Journal of Chemical Engineering,2008,16(4):646-649.
【14】刘欣芳. 904L和254SMO超级奥氏体不锈钢在高氯酸性环境中的点蚀行为研究[D]. 北京:北京化工大学,2017.
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