【摘要】 采用XRD、循环伏安和硬度测试等方法研究了不锈钢中的电化学诱导表面退火(EISA)的机理及处理工艺。结果表明:阴极过程中的H+离子还原、H原子向钢内部的扩散和积聚,阳极过程中H原子重新氧化是EISA相变的决定性过程。-1.44 V(相对于饱和甘汞电极)的阴极电位可致H+离子还原,足以导致EISA相变。当阳极电位高于0.3 V(相对于饱和甘汞电极)时会形成过厚的钝化膜,阻止H原子的扩散,从而抑制EISA相变。长阴极/短阳极的处理方式可以提高EISA处理效率。只有在电脉冲处理过程中防止溶液中Fe2+/Fe3+反应发生才会发生EISA相变。更多还原

【Abstract】 The principles and mechanism of electrochemically induced surface annealing( EISA) have been studied using XRD,cyclic voltammetry and hardness tests. H+ion reduction,and H atom penetration and accumulation in the steel during the cathodic part,together with H atom re-oxidization in the anodic part were found to be the critical steps in the EISA treatment. A cathodic potential of- 1. 44 V( vs. SCE),which can reduce H+ions,is low enough for EISA treatment. An anodic potential higher than 0. 3 V( vs. SCE) may cause too thick a passive film,which will obstruct the diffusion of H atoms and hinder the EISA phase transformation. A long-cathode / short-anode EISA treatment can improve the efficiency of the treatment. EISA phase transformation can only occur in a solution which does not give Fe2 +/ Fe3 +reaction during the treatment process.更多还原