铝硅合金压铸件浸锌对化学镀Ni-P层的影响

EFFECT OF PRE-ZINKING PROCESSES ON QUALITY OF ELECTROLESS NICKEL PLATING ON Si-CONTAINING Al-ALLOY

从锌合金层的微观形貌、组成、厚度、耐蚀性等以及化学镀Ni-P层的微观形貌、成分、相结构、孔隙率、耐蚀性、结合力等方面研究了浸锌层对化学镀Ni-P层的影响.结果表明,浸锌层对铝硅合金压铸件基体与化学镀层的结合起重要作用,浸锌层厚度薄且致密、均匀;后续的化学镀Ni-P合金层也细致均匀,结合力好,耐蚀性强.

This paper describes the effect of pre-zinking processes on the quality of electroless nickel （EN） plating on a silicon-containing Al-alloy, by analyzing micromorophology, composition, thickness and corrosion resistance of zincate deposit, and the micromorphology, component, phase constituent, porosity, corrosion resistance and adhesion of EN plating as well. The results showed that zinking deposit was an important bridge connecting Si-containing aluminum alloy and EN plating. It was concluded that if there came to be a thin, well-distributed zinc on Si-contained aluminum alloy, the sequent EN deposit would be thin with good adhesion and high anti-corrosion performance.