EFFECT OF HEAT TREATMENT ON ADHESION OF NICKEL ELECTROLESS COATINGS
热处理对化学镀薄膜结合强度影响

The effects of the heat treatment and coating hardness on the adhesion of electroless nickel coatings, NiP and NiB, have been evaluated by the scraping method. It was found that the adhesion of the electroless nickel coatings (NiP and NiB) was intensely affected by the heat treatment. The highest adhesion was obtained after the heat treatment at 200 1 h, and then the adhesion rapidly decreased with increasing the heat treatment temperature. It was also found that the adhesions was mainly related to the chemical compositions, microstructures and internal stresses of the electroless nickel coatings. The coatings with the amorphous microstructures and low internal stresses usually have a higher adhesion, comparing to the coatings with crystalline structures. \=