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在SUH409L铁素体不锈钢汽车排气管表面进行了单道和多道Ni60CuMoW+1.00%Ti复合粉末熔覆。EDAX和X射线衍射分析表明,熔覆层主要由γ-(Fe,Ni)固溶体,以及NiCu、Mo9Ti4、CuNiTi、CrNiFeC化合物和Ni2Si、Fe3Ni3B、WC等硬质相构成。光学显微观察显示熔覆层组织均匀、致密,与基体结合良好。熔覆层硬度明显高于基体,最高出现在四道试样第三道熔覆区中部,达到671 HV0.5,超过基体的4倍。在5.0%NaCl饱和溶液中的电化学腐蚀结果表明,熔覆层自腐蚀最高电位为-772.30 mV,腐蚀最低电流密度0.71μA/cm2,分别较基体上升了200.30 mV和降低了75.56%,经比较后,多道试样耐腐蚀性能最好。
Single and multi-pass Ni60CuMoW + 1.00% Ti composite powder cladding was performed on the surface of SUH409L ferritic stainless steel exhaust pipe. EDAX and X-ray diffraction analysis showed that the coating mainly consists of γ- (Fe, Ni) solid solution and NiCu, Mo9Ti4, CuNiTi, CrNiFeC compounds and hard phases such as Ni2Si, Fe3Ni3B and WC. Optical microscopic observation shows that the cladding structure is uniform and dense, and it has a good bond with the matrix. The hardness of the cladding layer is obviously higher than that of the matrix, and the maximum appears in the middle of the third cladding zone of the four samples, reaching 671 HV0.5, more than 4 times of the matrix. The results of electrochemical corrosion in 5.0% NaCl saturated solution showed that the maximum self-corrosion potential of the coating was -772.30 mV and the lowest corrosion current density was 0.71 μA / cm2, which was 200.30 mV and 75.56% lower than that of the substrate respectively. After multi-channel sample corrosion resistance best.