摘要
用全浸化学腐蚀和电化学测量技术的研究表明,HS^-和HCO_3^-对该合金在含Cl^-介质中的腐蚀行为具有明显的抑制作用,而且在HS^-和HCO_3^-浓度为0.001～0.1mol/L范围内,随浓度的增加抑制作用加强。腐蚀速度v_c与溶液中Na_2S浓度c_(Na_2)s之间的关系满足方程:lgv_c=-algc_(Na_2)s+lgb,运用SEM,EDAX,AES和ESCA等现代分析手段对腐蚀产物进行了分析,结果表明,Ni-P非晶态合金在该介质中具有优良的耐蚀性,其原因是腐蚀过程中合金表面上形成了一层致密的、保护性良好的富磷层。
Corrosion behaviour of the alloy in solution containing the ions Cl^-, HS^- and HCO_3^- was studied by chemical immersion and electrochemical technique. Result shows: the HS^-and HCO_3^- have stronger inhibition on corrosion in the solution containing Cl^-, and the inhibitive effect is enhanced as their content increases when their concentration is respectively in an extent from 0.001 to 0.1 mol/L. Relation between Na_2S concentration and corrosion rate v_c was found as: Igv_c=-algcNa_2S+Igb, where the a and b are constents. Corrosion product on Ni-P alloy in above medium was analyzed, and the result indicates that the excellent corrosion resistance it due to fine, compact layer rich in phosphorous.
关键词
镍基合金
金属玻璃
化学镀
Nickel-base alloy
Phosphorous-containing alloy
Metal glass
Chemical plating
Corrosion resistance
Corrosion mechanism
Reservior water
