WC - 10Co4Cr与NiCr - Cr3C2等硬质合金涂层具有很强的防腐蚀性能和耐磨性能，常被应用于各类腐蚀磨损环境中。为研究温度变化对硬质合金涂层腐蚀性能及摩擦磨损性能的影响，采用超音速火焰喷涂工艺在304不锈钢基体上制备了WC - 10Co4Cr和NiCr - Cr3C2硬质合金涂层，利用XRD、电化学测试以及滑动磨损测试等方法，研究了环境温度上升时涂层耐蚀性能的变化，并分析了腐蚀对涂层摩擦磨损性能的影响。结果表明：当环境温度从25 ℃上升至60 ℃后，WC - 10Co4Cr和NiCr - Cr3C2涂层在0.5 mol/L H2SO4溶液中的腐蚀电流密度分别增加了2.7倍和23.9倍。滑动磨损测试中，腐蚀前，WC - 10Co4Cr涂层与蓝宝石研磨球摩擦前后的质量损失为1 mg，约为NiCr - Cr3C2涂层的1/5；腐蚀后，WC - 10Co4Cr与NiCr - Cr3C2涂层磨擦前后的质量损失分别增加了1.9倍和2.9倍。WC - 10Co4Cr涂层的主要失效形式是磨粒磨损，而NiCr - Cr3C2涂层在滑动磨损测试时的主要失效形式为磨粒磨损与黏着磨损并存。腐蚀能加剧涂层的磨损速率，并对涂层在磨合阶段的摩擦行为产生影响。
Cemented carbide coatings such as WC - 10Co4Cr and NiCr - Cr3C2 have strong corrosion resistance and wear resistance, and so they are often used in various corrosive and wearing environments. In order to study the effect of temperature changes on the corrosion and friction properties of cemented carbide coatings, the high velocity oxygen fuel spraying process was used to prepare WC - 10Co4Cr and NiCr - Cr3C2 coating on 304 stainless steel substrates. The corrosion resistance changed with the temperature variation and the effect of corrosion on the wearing properties were studied by XRD, electrochemical test and sliding wear test. Result showed that when temperature changed from 25 ℃ to 60 ℃, the corrosion current density in 0.5 mol/L H2SO4 solution increased 2.7 times for WC - 10Co4Cr coating and 23.9 times for NiCr - Cr3C2 coatings, respectively. In the sliding test, the mass loss of WC - 10Co4Cr coating with the sapphire grinding ball is 1 mg before corrosion, which was is about 20% of the mass loss for NiCr - Cr3C2 coatings. In contrast, the mass loss increased 1.9 times for WC - 10Co4Cr and 2.9 times for NiCr - Cr3C2 sample after corrosion. Besides, the main failure mode of WC - 10Co4Cr coating was abrasive wear, while that of NiCr - Cr3C2 coating contained the abrasive wear and adhesive wear during sliding wear test. Moreover, corrosion could increase the wear rate of the coating and affect the friction behavior of the coating during the running - in stage.
