An Al-5Mg alloy (AA5083) block, deposited over an AA6061 substrate by wire-arc additive manufacturing, was electrochemically tested along two different cross-sectional planes by cyclic polarization in 3.5 wt.% NaCl. The deposited layers and the interlayer boundaries showed similar polarization behavior regardless of the cross-sectional direction. The corrosion of both the substrate and the deposited layers was mainly attributed to the presence of relatively coarse intermetallic Al(Fe, Mn)Si particles. In the substrate, corrosion was governed by deep crevices along the interfaces of directionally aligned Al(Fe, Mn)Si particles with the Al matrix. The deposited layers and the interlayer boundaries showed pitting around numerous Al(Fe, Mn)Si particles and/or Al(Fe, Mn, Cr, Ti)Si at the interlayer boundaries, which were much finer compared to those of the substrate. The abundance of the fine precipitates and their intergranular location caused surface material removal, which was more extensive along the interlayer boundaries. The perpendicular z-y and z-x planes of the deposited block did not show significant differences in anodic polarization behavior. Differences were more distinct in the case of cathodic polarization. Some anisotropy in polarization behavior was noted through the thickness of the z-y plane that complies with the obtained tensile behavior.

通过线弧增材制造法在AA6061基板上沉积的Al-5Mg合金（AA5083）块通过在3.5 wt。％NaCl中的循环极化沿两个不同的横截面进行电化学测试。不管横截面方向如何，沉积层和层间边界都表现出相似的极化行为。基材和沉积层的腐蚀主要归因于存在相对较粗的金属间金属Al（Fe，Mn）Si颗粒。在基材中，腐蚀是沿着定向排列的Al（Fe，Mn）Si颗粒与Al基体的界面处的深缝隙控制的。沉积层和层间边界显示出大量的Al（Fe，Mn）Si颗粒和/或在层间边界处的Al（Fe，Mn，Cr，Ti）Si周围出现点蚀，与基材相比要细得多。细小沉淀物的大量存在及其在晶间的位置导致表面材料的去除，沿层间边界范围更广。垂直沉积块的zy和zx平面在阳极极化行为方面没有显示出显着差异。在阴极极化的情况下，差异更为明显。通过符合所获得的拉伸行为的zy平面的厚度，注意到了极化行为的一些各向异性。