C+W+C离子注入H13钢复合钝化层的抗腐蚀特性

Properties of corrosion resistance in C+W+C multi-implanted steel

用多次扫描电位法研究了C +W +C离子注入H13钢的结构和相变及其对抗腐蚀特性的影响 ,研究了抗腐蚀相生成的条件以及这些相对抗腐蚀特性的作用 ,并对其改性机理进行了讨论。实验结果表明 ,W离子和C离子多重离子注入H13钢可在注入层中形成超饱和浓度的W和C原子分布 ,分布形状为类高斯分布 ;并可在注入层中形成钨的碳化物WC和W2 C相、合金相Fe2 W和Fe6 W6 C等 ,这些弥散相不但可以使注入层强化 ,而且也可使表面钝化 ,从而增强了表面抗腐蚀特性 ;W和C双重离子注入具有W和C单离子注入的特性 ,可进一步提高H13钢的抗腐蚀特性 ,随着W重离子和C重离子注入剂量的增加 ,抗腐蚀特性进一步增强。样品C3W 3C3的Jp 经 50个周期腐蚀后 ,其值比H13钢的Jp 下降了 6 0 % ,而C3W 3的Jp 比H13钢的Jp 下降了4 7%。C3W 3C3的Jp 比C3W 3的Jp 小 34%。扫描电子显微镜观察表明 ,腐蚀后抗腐蚀的钝化层依然存在。

The influence of conditions of C3W3C3-implanted H13 steel on corrosion resistance was studied using multi-sweep cyclic voltammetry. The structure and formation conditions of phases in corrosion resistance and effects on corrosion resistance were researched. A super-saturated solid solution of W and C atoms was formed in C3W3C3-implanted steel; the phases of Fe 2W, WC and FeW 3C were obtained in the implanted surface of steel. A passivation layer was formed. Because the multi-implantation possessed both advantage of W and C single implantation in corrosion resistance, so that the implantation is better than single and dual-implantation. The corrosion resistance of the multi-implantation was enhanced following increase of ion dose. After corrosion for 50 voltage sweeps, the J p of C3W3C3 and C3W3 decreased 60% and 47% comparing to H13 steel respectively. The J p of C3W3C3 decreased 34% comparing to C3W3. It is found from SEM observation that after corrosion the passivation layer still existed.