非晶态Ni—P合金在碱性介质中的阳极行为

用动电位极化方法研究了3种不同化学镀工艺得到的Ni-P非晶态合金镀层,在1mol/1NaOH碱性介质中的阳极极化行为,并通过XPS分析了不同极化电位下的表面膜.结果表明:在所研究的体系中不存在随P增加阳极溶解电流下降的规律;尽管合金表面存在H_2PO_2~-和PO_4~-离子,但并没有有效地抑制Ni-P合金的阳极溶解。P的强烈的水化作用可能是导致非晶态Ni-P合金的阳极溶解电流比纯Ni更大的主要原因。

Polarization Behaviour of Amorphous Ni-P Alloys in NaOH Solution

Polarization behaviour of electroless amorphous Ni-P alloy coatings have been investigated in 1mol/1 NaOH solution using potentiodynamic method, and surface films at different potentials have been analysed on the basis of XPS method. Results indicate: the anodic dissolution current does not decrease with the increase of P content in the Ni-P alloy, even though there exists H2PO2- and PO4- on the surface film, anodic dissolution of alloys has not been inhibited effectively. The intense hydrolization of P may be the cause of making the dissolution current of Ni-P alloy higher than that of Ni.