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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。
With reference to the simulated inner bottom plate test method stipulated in IMO Performance Standard for Corrosion Resistant Steel of Tank Oil Tanks, the comparison between the low-alloy steel and the conventional low-alloy steel Etching rate of low alloy steel corrosion and pitting corrosion behavior with temperature changes. The test results show that the corrosion rate of corrosion resistant low alloy steel with copper and nickel elements is reduced by more than 90% compared with that of the conventional low alloy steel, and the corrosion resistance and corrosion resistance of the low alloy steel is better than the conventional low alloy steel in inhibiting the growth and expansion of pitting corrosion. Corrosion-resistant low alloy steel surface and the pits are distributed within the white particles for the re-deposition of copper due. The distribution of pure copper particles on the test steel surface can effectively improve the corrosion potential of steel. The enrichment inside the pits can effectively suppress the pitting corrosion depth in the depth direction.