coating action
2.(b)during the operation of the differential aeration cell beneath the coating,zinc phosphate imparts excellent buffering action to the anolyte and catholyte and acts as an effective inhibitor to the base metal, consequently the blistering tendency of the paint film at the cathode and the corrosion rate of base metal at the anode are lowered.
4.A bright electroless Ni-P coating was thus prepared by introducing brightener butyne-1,4-diol (coded as BOZ) of proper concentration in the optimized electroless Ni-P bath. The morphology and composition of the resulting bright electroless Ni-P coating were analyzed by means of scanning electron microscopy and X-ray diffraction, while the action mechanism of the brightener was explored as well.
