A kind of integrated process of extreme high-speed laser cladding (EHLC) and laser remelting (LR) was firstly proposed to comprehensively improve surface quality and internal interlayer bonding strength of pure EHLCed coatings. The influence mechanism of integrated process on microstructure and corrosion resistance was carefully studied. The integrated process effectively optimized the surface roughness (reduced >60%), and eliminated interlayer defects, especially for the multi-layer coating. Results indicated that both of the coatings manufactured by EHLC and EHLC-LR comprised dominant ultrafine grains. However, electrochemical measurements showed that the EHLC-LRed coating possessed better corrosion resistance and lower corrosion rate compared to EHLCed counterpart. It was proposed that this behavior was due to a high density of ultra-fine grains with numerous grain boundaries uniformly distributed on the coating surface forming a more stable oxide film.

首次提出了一种极高速激光熔覆（EHLC）和激光重熔（LR）的集成工艺，以全面提高纯EHLCed涂层的表面质量和内部层间结合强度。仔细研究了集成工艺对显微组织和耐腐蚀性能的影响机制。一体化工艺有效优化表面粗糙度（降低>60%），消除层间缺陷，尤其是多层涂层。结果表明，EHLC 和 EHLC-LR 制造的涂层均包含主要的超细晶粒。然而，电化学测量表明，与 EHLCed 涂层相比，EHLC-LRed 涂层具有更好的耐腐蚀性和更低的腐蚀速率。