温度对硅醛涂层水冷器牺牲阳极保护的影响研究

Effect of Temperature on Sacrificial Anode Protection of Silicone Aldehyde Coated Water Cooler

为了获得不同温度下水冷器牺牲阳极保护的边界参数,采用恒电位和动电位扫描方法研究了AZ31B镁合金牺牲阳极、10#碳钢以及硅醛涂层保护的10#碳钢在不同温度模拟冷却水的电化学性能。试验结果表明,温度对AZ31B镁合金牺牲阳极性能影响显著,腐蚀电位随着温度升高;在30~90℃工作温度范围内,硅醛涂层具有良好的保护性能,阴极极化电流密度较小,与牺牲阳极联合后,可对水冷器起到良好的保护作用。同时通过10#碳钢以及硅醛涂层钢阴极极化曲线和AZ31B镁合金阳极极化曲线获得了水冷器后续牺牲阳极保护模拟计算所需的边界条件。

In order to obtain boundary parameters for sacrificial anode protection of water coolers at different temperatures,constant potential and potentiodynamic scanning methods are used to study the electrochemical performance of AZ31B magnesium alloy sacrificial anode,10 # carbon steel,and 10 # carbon steel protected by silicon aldehyde coating in simulated cooling water at different temperatures.The experiments results indicate that the temperature has a significant impact on AZ31B magnesium alloy,and the corrosion potential increases with temperature.The silicone aldehyde coating has good protective performance with a low cathodic polarization current density within the temperature range of 30~90 ℃.It can provide good protection for the water cooler combined with the sacrificial anode.The boundary conditions required for the subsequent sacrificial anode protection simulation calculation of the water cooler were obtained through the cathodic polarization curves of 10 # carbon steel and silicon aldehyde coated steel,as well as the anodic polarization curves of AZ31B magnesium alloy.