Ni Cr-Cr_3C_2、Ni60B及0Cr19Ni9是三种包含Ni-Cr的热喷涂材料,主要用于电站锅炉受热面防腐蚀治理。为了从电化学的角度出发,更加深入地探讨热喷涂涂层的高温腐蚀机理,对三种喷涂材料的电极电位进行了测试。采用线形回归方法,推断出650℃时三种喷涂材料的电极电位与离子浓度的关系。结果表明:650℃离子浓度相同时,Ni-Cr系列热喷涂材料的电极电位由高到低分别为Ni60B、NiCr-Cr_3C_2和0Cr19Ni9。Ni60B与NiCr-Cr_3C_2的电极电位始终高于20钢;当0Cr19Ni9离子浓度等于0.3299 mol/L时,其电极电位与20 g钢相等。 Ni Cr-Cr_3C_2, Ni60B and 0Cr19Ni9 are three thermal spraying materials containing Ni-Cr, which are mainly used for the anti-corrosion treatment of the heating surface of power station boilers. In order to explore the mechanism of high temperature corrosion of thermal spraying coating from the electrochemical point of view, the electrode potentials of three spraying materials were tested. The linear regression method was used to infer the relationship between the electrode potential and the ion concentration of the three spraying materials at 650 ℃. The results show that when the ion concentration is the same at 650 ℃, the electrode potentials of Ni-Cr series thermal spraying materials are Ni60B, NiCr-Cr_3C_2 and 0Cr19Ni9 from high to low respectively. The electrode potentials of Ni60B and NiCr-Cr_3C_2 are always higher than that of 20 steel. When 0Cr19Ni9 ion concentration is equal to 0.3299 mol / L, the electrode potentials are equal to 20 g steel.