参照国际海事组织(IMO)发布的《油轮货油舱耐蚀钢性能标准》中所规定的模拟内底板试验方法,对比研究了在强酸性高氯离子浓度的环境下,传统低合金钢和耐蚀低合金钢的腐蚀速率及点蚀行为随温度变化的规律.试验结果表明,添加铜、镍元素的耐蚀低合金钢腐蚀速率较传统低合金钢最高降低了90%以上,并且具有优于传统低合金钢的抑制点蚀增殖、扩展的性能.耐蚀低合金钢表面及点蚀坑内部分布有白色颗粒,为铜元素的再沉积所致.该纯铜颗粒分布于试验钢表面可以有效提高钢的腐蚀电位,在点蚀坑内部的富集可以有效抑制点蚀坑在深度方向上的扩展.
The corrosion rate and pitting behavior of traditional and corrosion-resisting low alloy steel in strongly acidic solution containing chloride ion were investigated at different temperatures,according to the test method of Performance Standard for Corrosion Resistant Steel Cargo Oil Tanks of Crude Oil Tankers adopted by International Maritime Organi-zation(IMO). The results indicated that corrosion rates of the anti-corrosion steel,which contained Cu and Ni ele-ments,were decreased by more than 90%at most compared to conventional steel under various temperatures. Further-more,anti-corrosion steel could decrease the number of pitting and suppress pitting extension. The granular corrosion products which were white and partly located in the pitting were turned out to be Cu deposition. The Cu redeposit parti-cles which covered the surface and inside the pitting,made the corrosion potential higher. The Cu redeposit particles on the specimens surface and inside the pits suppressed the extension of the pitting to the deeper.
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