Data for: Effect of grain boundary precipitation on corrosion of heating-aging treated Al-4.47Zn-2.13Mg-1.20Cu alloy

1. The yield strength, tensile strength and elongation are measured by tensile test. 2. The equivalent circuit of galvanic corrosion are fitting by the software of ZSimDemo. When the equivalent circuit diagram (R(CR(CR))) is used, the data error under all conditions is less than 5%. The fitting data are listed in table 3. 3. The corroded surface morphologies are testing by TESCAN VEGA III, the microstructure of the intragranular precipitates and precipitates in the grain boundary are showing by JEOL-2100F.1. 通过拉伸试验测定材料的屈服强度、抗拉强度与断后伸长率。 2. 采用ZSimDemo软件对电偶腐蚀的等效电路进行拟合；当采用等效电路模型R(CR(CR))时，所有试验工况下的数据拟合误差均小于5%，拟合结果列于表3。 3. 采用TESCAN VEGA III型设备表征腐蚀试样的表面形貌，通过JEOL-2100F型设备观察晶内析出相与晶界析出相的微观组织。