<正> 一、前言 奥氏体不锈钢已广为应用,但它在含C1~-介质中的应力腐蚀(SCC)倾向却十分严重。 对奥氏体不锈钢进行料浆渗铝,渗层延展性好,不易剥离和开裂,可以起到良好的环境遮断和电偶保护作用,应该是防止奥氏体不锈钢SCC的有效途径,但除原泰弘等作过一点初步
By means of constant load tests and slow strain rate tests, the influence of slurry aluminising on SCC behavior of 304 steel was investigated. The experiments were performed in boiling 42% MgCl_2 solution. Specimens of different thicknesses of aluminised layer were prepared by varying the time of aluminising. In addition, X-ray diffraction, X-ray energy spectrum, electrochemical method and fractography analysis were used to clarify the mechanisms of protection of slurry aluminising against SCC of 304 stainless steel. The results showed that the aluminised layer of 304 stainless steel consisted of duplex structure with the outer layer being principally FeAl_3 and inner layer being FeAl_3 with FeAl. The SCC susceptibility of 304 stainless steel was markedly decreased by aluminising and the extent of reduction was mainly dependent upon the ductility and thickness of aluminised layer. In accordance with experimental data, the mechanisms of protection of aluminising on SCC behavior of 304 stainless steel were suggested, the favourable influence was essentially due to environment separation and galvanic protection.
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