汽车用Q 2 5 5钢在含融雪盐雪水中的腐蚀行为

The Corrosion Behavior of Automobile Steel in theSnow Water with Snow Melting Salt

宁树刚 史艳华 梁 平 林 立

Ning Shugang Shi Yanhua Liang Ping Lin Li

关键词: 融雪盐, 雪水, 电化学实验, , 浸泡实验, 汽车用钢

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 168 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 F e 2+ 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.

10.3696/j.issn.1672-6952.2015.01.015