304不锈钢表面预处理对沉积CrMoN涂层性能的影响

使用砂纸将对304不锈钢基体依次打磨至1200^#(1^#工艺)、2000^#(2^#工艺),以及打磨磨至2000^#并经粒度0.5μm金刚石抛光膏抛光(3^#工艺)后,在其表面沉积CrMoN涂层,研究了涂层的物相组成、表面与截面形貌、硬度、表面疏水性、耐腐蚀性能和导电性。结果表明:1^#工艺预处理基体表面沉积涂层的表面粗糙度最大,2^#工艺预处理后的次之,3^#工艺预处理后的最小;涂层均由CrN,Cr₂N,Mo₂N等物相组成;随着基体表面粗糙度的降低,涂层的显微硬度、自腐蚀电位和水接触角增大,自腐蚀电流密度、极化后的界面接触电阻降低;2^#工艺预处理基体表面沉积CrMoN涂层的综合性能优异,与3^#工艺预处理的接近。

Effect of Surface Pretreatment of 304 Stainless Steel on Properties of Deposited CrMoN Coating

The 304 stainless steel substrate was grinded to 1200^#(1^#process),2000^#(2^#process)by sandpaper in sequence and grinded to 2000^#and polished by diamond polishing paste with size of 0.5μm(3^#process),respectively,and then the CrMoN coating was deposited on the surface.The phase composition,surface and cross-section morphology,hardness,surface hydrophobicity,corrosion resistance and conductivity of the coating were studied.The results show that the roughness of the coating surface deposited on the substrate surface pretreated with 1^#process was the largest,followed by that pretreated with 2^#process,and the roughness that pretreated with 3^#process was smallest.The phase of the coating consisted of CrN,Cr₂N and Mo₂N.With decreasing substrate surface roughness,the microhardness,free corrosion potential and water contact angle of the coating increased,and the corrosion current density and interface contact resistance after polarization decreased.The comprehensive properties of the CrMoN coating deposited on the substrate surface pretreated with 2^#process were excellent,which were close to those pretreated with 3^#process.