Influence of Low Energy Density Laser Re-Melting on the Properties of Cold Sprayed FeCoCrMoBCY Amorphous Alloy Coatings

Fe-based amorphous alloys (FAA) have excellent anti-corrosion and anti-abrasive comprehensive performances. However, sprayed thin FAA coatings with high porosity cannot provide efficient protection, or even accelerate the corrosion rate of substrate due to galvanic corrosion. Laser re-melting densifying is usually used improve performance coatings. There are two disadvantages common laser method, including crystallization residual stress. In present paper, a low density energy method was cold spraying (CS) FeCoCrMoBCY coating on 40Cr substrate. The results show that CS were crystallized partially during melting process. hardness improved at zone after re-melting, which improves performance. Potentiodynamic test can decrease rate, but salt spray indicates eliminate penetrated diffusion passage. Further optimization should be conducted anticorrosion for this method.