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采用热扩渗方法在低碳钢表面制备了Fe-Co、Fe-Ni和Fe-Co-Ni合金化层.热扩渗过程在1 000℃的纯H2气氛中进行,处理时间为5h.采用XRD、EDS和SEM对合金化层的组成和微结构进行了测试,并采用电化学手段分析了合金化层在硼酸缓冲溶液(pH=8.4)中的钝化行为.结果表明,合金化层均为单一α-Fe固溶体相;Fe-Ni合金化层以及镍含量相对高的Fe-Co-Ni合金化层表面易于形成致密的钝化膜;这些钝化膜可以明显改善低碳钢基体在碱性溶液环境中的耐蚀性.

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