CAJ | 학술논문

采用浸泡法和电化学实验研究了汽车用 Q255钢在不同融雪盐(NaCl)质量分数雪水溶液中的腐蚀行为。浸泡实验结果表明,含融雪盐的雪水溶液比天然雪水更具腐蚀性,Q255钢在天然雪水中腐蚀速率较小,浸泡168 h 后的腐蚀速率为0.02107 mm/a；随着雪水中 NaCl 质量分数的增加,腐蚀速率也随着增大,在质量分数为3%NaCl 雪水溶液中,Q255钢的腐蚀速率为0.03971 mm/a,比纯雪水中 Q255钢的腐蚀速率高出将近1倍。电化学实验结果表明,Cl-的存在加速了腐蚀产物 Fe2+的溶解和传质过程,减弱了腐蚀产物的附着,使腐蚀产物起不到保护作用,加快了 Q255钢的腐蚀速度。
채용침포법화전화학실험연구료기차용 Q255강재불동융설염(NaCl)질량분수설수용액중적부식행위。침포실험결과표명,함융설염적설수용액비천연설수경구부식성,Q255강재천연설수중부식속솔교소,침포168 h 후적부식속솔위0.02107 mm/a；수착설수중 NaCl 질량분수적증가,부식속솔야수착증대,재질량분수위3%NaCl 설수용액중,Q255강적부식속솔위0.03971 mm/a,비순설수중 Q255강적부식속솔고출장근1배。전화학실험결과표명,Cl-적존재가속료부식산물 Fe2+적용해화전질과정,감약료부식산물적부착,사부식산물기불도보호작용,가쾌료 Q255강적부식속도。
The immersion and electrochemical methods has been used to study the corrosion behavior of automotive steel Q255 in different content of snow melting salt (NaCl)solution.Immersion test show that,the snow melting salt solution is more corrosive than the natural snow solution.The corrosion rate of Q255 steel in the natural water water is smaller than that of the snow melting salt solution,with the corrosion rate of 0.021 07 mm/a after the immersion of 1 68 h.The corrosion rate increased with the increase of NaCl concentration of the snow solution.The corrosion rate of Q255 steel could reach 0.039 71 mm/a in 3%NaCl solution,the value of which was almost double to the natural snow solution.Electrochemical experiments show that, the presence of chloride ions accelerated the dissolution and mass transfer process of Fe2+ corrosion products,subsequently reduced the adhesion of the corrosion product.Accordingly,the corrosion products would not be able to protect the steel surface,thus the corrosion rate accelerated.