两种AC-HVAF喷涂WC涂层微观组织以及耐蚀性研究

利用AC-HAVF喷涂技术在0Cr13Ni5Mo不锈钢上制备了WC-10Co-4Cr,WC-12Co涂层,并利用XRD,SEM,电化学以及盐雾实验分析了涂层的微观组织以及耐蚀性.结果表明:两种涂层相组成与其粉末一致,未出现其他喷涂技术普遍存在的W2C以及W,AC-HAVF喷涂技术可以有效的抑制WC的分解;两种涂层都很致密且与基体结合良好,孔隙率低;电化学以及盐雾实验发现,WC-10Co-4Cr涂层的耐蚀性好于WC-12Co涂层,并较基体0Cr13Ni5Mo不锈钢有较大的提高,粘结相中Cr元素的加入以及孔隙率低是WC-10Co-4Cr涂层耐蚀性优异的重要原因.

Investigation of Microstructures and Corrosion Resistance of Two Types of AC-HVAF Sprayed WC Coatings

WC-10Co-4Cr, WC-12Co coatings are prepared using advanced AC-HVAF spray on 0Cr13Ni5Mo stainless steel, the microstructures and corrosion resistance are investigated by XRD, SEM, electrochemistry and salt fog tests. The results show that the phases of the coatings are the same as that of the powers, W2C and W phases are not found, so the AC-HVAF spray technology can control the decomposition of the WC effectively; the coatings are well combined with the 0Cr13Ni5Mo stainless steel and the porosity rates are very low; electrochemistry and salt fog tests show that the corrosion resistance of the WC-10Co-4Cr coatings are better than WC-12Co coatings and 0Cr13Ni5Mo stainless steel; element Cr added in the binder and low porosity rate are the main reasons that the WC- 10Co-4Cr coatings have high corrosion resistance.