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利用扫描电镜(SEM)、电化学、光电子能谱(XPS)、激光原位、透射电镜(TEM)等方法研究了Cu-Ni-Sn体系船体钢在强酸性氯离子环境下的腐蚀行为。结果表明,采用Cu-Ni-Sn的耐蚀合金设计可以显著提高船体钢在强酸性氯离子环境下的耐蚀性,并满足IMO标准的要求;Cu是提高钢耐蚀性的有效元素,其主要机理为其以再沉积颗粒(100~500 nm)的方式在钢的表面富集,降低了钢的溶解速度并抑制点蚀的形核;随着钢中Sn含量的增加,钢的耐蚀性进一步提高,Sn在钢的表面形成了致密的SnO_2腐蚀产物保护膜,有效阻止了基体与腐蚀介质的相互作用,进一步抑制了钢的腐蚀。
The corrosion behavior of Cu-Ni-Sn steel in strong acid chloride environment was studied by means of SEM, electrochemical, photoelectron spectroscopy (XPS), laser in situ and transmission electron microscopy (TEM) The results show that the design of corrosion resistant alloy with Cu-Ni-Sn can significantly improve the corrosion resistance of hull steels under strong acid chloride environment and meet the requirements of IMO standards. Cu is an effective element to improve the corrosion resistance of steel. The main mechanism is that it re-deposited particles (100 ~ 500 nm) on the surface of the steel enrichment, reducing the dissolution rate of steel and inhibit pitting nucleation; with the increase of Sn content in steel, steel corrosion Further improvement of the properties of Sn formed a dense protective film of SnO 2 corrosion products on the surface of the steel, effectively preventing the interaction between the substrate and the corrosion medium and further inhibiting the corrosion of the steel.