激光熔敷工艺对镍基合金的耐蚀性影响的研究

我国火电厂千瓦汽轮机末级叶片在特定工况下其进气边常常遭到腐蚀．我们对其进行了激光直接重熔和激光熔敷镍基合金处理，经形貌观察，物相分析及阳极极化曲线测定，结果表明，激光处理后其耐蚀性均比处理前提高．其中熔敷镍基Ｇ１１２合金的耐蚀性提高最大．若激光处理参数匹配恰当，三者比较，涂敷的镍基ＷＣ合金更易印化、耐蚀性最好．

Influence of Laser Cladding Technology on the Corrosion Resistance of Ni Base Alloys

In order to avoid water erosion, we have respectively carried into effect laser surface remelting and laser cadding Ni base alloys on the leading edge of the last stage blades made of 2Cr13 steel in steam turbimes which work in the special circumstance of electric power plant. we have observed the microstructures and measured the surface hardness and the anodic polarization curves for the treated layer by laser. The results show that the microstructure is more fine, the hardness is more high and the surfaces possess excellent corrosion resistance than before laser treatment. For cladding Ni base G112 alloy, the improvement of corrosion resistance is especially remarkable . If laser treating parameters matching is appropriate, the cladding Ni base WC105 alloy is passivated easily and its corrosion resistance is th best of all.