One-step Pickling-activation Pretreatment Process of Magnesium Alloy

The corrosion behaviors of the magnesium alloy after four kinds of pickling-activation pretreatments were studied by weight loss method, SEM and potentiodynamic polarization curves. The effects of different pickling-activation processes on the morphology, composition and adhesion of the subsequent electroless plating Ni-Sn-P coatings were also studied. The results show that one-step pickling-activation has good affect on the erosiveness of magnesium alloy, the surface was roughness and even without corrosion products and the “interlocking” between coating and substrate was enhanced. The corrosion resistance of magnesium alloy after one-step pickling-activation pretreatment is the best. The Ni-Sn-P coating obtained after one-step pickling-activation can protect the magnesium alloy more effectively.