目的 研究几种典型金属材料在西沙海洋飞溅区的腐蚀行为规律。方法 通过外场暴露试验,分析3种钢、1种铜和3种铝合金材料暴露0.5,1,2 a后的腐蚀形貌与动力学规律。结果 3种钢的腐蚀质量损失与点蚀均较为严重,T2整个表面均匀减薄的同时,会产生大量微小的腐蚀坑,3种铝合金发生以点蚀为主的局部腐蚀,伴随有晶间腐蚀、选择性腐蚀等。结论 试验条件下,3种钢中Q235耐蚀性最差,T2整体耐蚀性较好,3种铝合金中5083耐点蚀性能最差,5052略优于6063。
Objective To investigate the corrosion behavior and rules of typical metal materials in Xisha marine splash zone. Methods Field exposure test was carried out on 3 kinds of steels, 1 kind of copper and 3 kinds of aluminium alloy materials for 0.5 a, 1 a and 2 a to analyze their corrosion morphology and kinetics rule. Results The corrosion weight loss and pitting phenomenon for 3 kinds of steels were severe; tiny corrosion pits were formed on entire surface of T2 during its evenly thinning process; localized corrosion which was mainly composed of pits occurred on three kinds of aluminium alloy, accompanied by intergranular corrosion, selective corrosion, et al. Conclusion Under the test conditions, the corro- sion resistance of Q235 is the worst among 3 kinds of steels; T2 has a good overall corrosion resistance; pitting resistance of 5083 is the worst, while 5052 is slightly better than 6063.
Equipment Environmental Engineering