Wear-Resistant and Corrosion-Resistant Amorphous Coating of High-Carbon Iron Alloy By Plasma Spraying

在减压条件下等离子喷涂含有大量碳和硼的Fe-Cr-Mo合金。所有喷涂涂层均为非晶态，具有800 ~ 1000 DPN的高硬度。非晶涂层在773 K或更高温度下结晶。非晶相结晶后，极细碳化物、硼碳化物或硼化物在chi相和/或铁素体基体中析出；使其硬度达到1300至1450 DPN。在1N H_2SO_4溶液中，喷涂非晶态涂层的阳极极化行为表现为活化-钝化转变。随着合金中硼含量的增加，镀层的有源和无源电流密度增大。不含硼涂层的耐蚀性优于SUS316L不锈钢涂层。

Fe-Cr-Mo alloys containing a large amount of carbon and/or boron were plasma sprayd under reduced pressure. All the sprayd coatings are amorphous and show a high hardness of 800 to 1000 DPN.The amophous coatings crystallize at about 773 K or more. Very fine carbides, borocarbides or borides precipitate in the matrix of chi phase and/or ferrite after crystallization of the amorphous phase ; bringing about a very high hardness of 1300 to 1450 DPN.The anodic polarization behavior of the as-sprayd amorphous coatings exhibits the activation-passivation transition in 1N H_2SO_4 solution. The active and passive current densities of the coatings increase with increasing boron content of the alloy. The corrosion resistance of the coating containing no boron is superior to SUS316L stainless steel coating.