化学镀镍-磷镀层在氢氟酸中的耐蚀性

Corrosion Resistance of Electroless Ni-P Coating in Hydrofluoric Acid

为了改善Q 235钢在氢氟酸中的耐蚀性,采用化学镀技术在其表面制备了镍-磷镀层。采用金相显微镜对镍-磷镀层的表面形貌进行了观察,通过浸泡和电化学等方法考察了Q 235钢和镍-磷镀层在氢氟酸中的耐蚀性。结果表明:所得镍-磷镀层光滑、致密、平整,在氢氟酸中表现出较低的自腐蚀电流密度和较大的电荷转移电阻,可明显降低Q 235钢在氢氟酸中的腐蚀速率。

In order to improve the corrosion resistance of Q 235 steel in hydrofluoric acid, a Ni-P coating was prepared on its surface by electroless plating. The surface morphology of the coating was observed using metalloscope, and the corrosion behavior of Q 235 steel and Ni-P coating was investigated by immersion and electrochemical method. The results show that the Ni-P coating is smooth and dense, and exhibits a lower self-corrosion current density and a higher charge-transfer resistance in hydrofluoric acid, that can obviously decrease the corrosion rate of Q 235 steel in hydrofluoric acid.