Effects of Environmental Factors on Pitting Corrosion Behavior of 1.4539 Stainless Steel
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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.
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Keywords:
- 1.4539 stainless steel /
- temperature /
- applied load /
- pitting corrosion
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