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采用国际海事组织(IMO)模拟油轮货油舱内底板环境试验方法,对比分析了传统船板和耐腐蚀船板的腐蚀失重与腐蚀形貌,深入研究了环境温度对船用耐蚀钢腐蚀行为影响规律。结果表明,环境温度对船板腐蚀行为存在显著影响,随着环境温度(30～50℃)的升高,点蚀坑的数量逐渐增多,点蚀坑深度先增大后减小,在45℃时达到峰值。2种钢点蚀行为差别较大,传统船板钢点蚀坑的深度直径比(h/D)随环境温度的增大而增大,而耐蚀船板则呈现逐步下降的趋势。耐蚀合金元素的加入有效降低了船板钢在不同温度下的腐蚀速率,减小了钢的点蚀坑数量,改善了点蚀坑的扩展方式。即点蚀坑由纵向深度方向扩展,转为横向表面方向扩展,有效提高了船板的安全性。
The International Maritime Organization (IMO) was used to simulate the environment test method of tank bottom in oil tanker. The corrosion weight loss and corrosion morphology of traditional shipboard and corrosion resistant shipboard were analyzed. The influence of ambient temperature on the corrosion behavior of marine corrosion resistant steel law. The results show that the ambient temperature has a significant effect on the corrosion behavior of ship deck. With the increase of ambient temperature (30-50 ℃), the number of pits increases gradually, and the depth of pits first increases and then decreases. At 45 ℃ When the peak. The pitting corrosion behavior of the two kinds of steel is quite different. The depth-diameter ratio (h / D) of pitting pit increases with the increase of ambient temperature, while the corrosion-resistant ship plate shows a gradual downward trend. The addition of corrosion-resistant alloying elements effectively reduces the corrosion rate of shipboard steel at different temperatures, reduces the number of pits in steel and improves the way of pits’ expansion. That is, the pits are extended from the longitudinal depth direction to the lateral surface direction, which effectively improves the safety of the ship’s plate.