【摘要】 通过腐蚀失重和电化学试验,研究了不同铈含量的铸造高镍铬不锈钢在还原性酸中的耐蚀性能。测定了钝化膜的自活化时间,分析了钝化膜表层的结构、元素含量和分布及其氧化物的组态。结果表明,当钢中铈含量超过0.1%时,在钝化膜表层由于铈的富集,使耐蚀元素铬、钼含量减少,降低其稳定性,削弱钼对钝化膜的修补作用,增加膜表层活性点,从而破坏了钢的钝化,降低其耐蚀性能。更多还原

【Abstract】 Corrosion weight loss test and electrochemical test have been carried out tostudy the corrosion resistance of a high Ni-Cr cast stainless steel with differentCe contents in reductive acids.In order to reveal the mechanism of excessive Ceon the corrosion resistance of the steel,AES and SIMS are used to determine thecontent of different elements in the outer passive films and their profiles,and alsothe self-actived time of the steel has been determined.In addition,XPS are usedto analyze the structure of the outer passive film.Test results indicate that corrosion resistance of the steel will reduce whenits Ce content exceeds 0.1%.It can attribute to the enrichment of cerium in ou-ter passive film which causes the reduction of Cr and Mo,makes the film unsta-ble,weakens the restoration effect of Mo on the film,and increases the numberof active points in outer passive film,thus the passive state of the steel is de-stroyed and the corrosion resistance reduced.更多还原