3D打印铝合金液冷板在冷却液中的静态腐蚀

目的 对比3D打印铝合金液冷板材料经不同表面处理后在冷却液中的静态腐蚀情况，并预测静态腐蚀速率。方法 通过pH值测试、腐蚀表面形貌分析来监测冷却液和铝合金的变化，通过电化学方法测试样件的腐蚀动力学参数，通过质量损失试验测量材料的腐蚀速率和年腐蚀深度，通过EDS分析腐蚀产物。结果 所有试验组冷却液pH均整体呈下降趋势。在试样表面可以观测到明显的腐蚀现象，集中发生于试样表面的缺陷位置。不同表面处理的样件，其腐蚀速率不同，差异最大可达16倍。冷却液中的有效缓蚀成分参与了试样表面腐蚀产物膜的形成，在表面沉积了P、Ca等元素。结论 3D打印成形铝合金材料在冷却液中的年腐蚀深度整体较小，其耐蚀性良好，进行液态磨粒抛光或酸洗处理能降低研究材料在冷却液中的静态腐蚀速率。

Static Corrosion of Aluminum Alloy Liquid Cooling Plate Made by 3D Printing in Coolant

The work aims to compare the static corrosion behavior of 3D printed aluminum alloy liquid cooling plates subject to different surface treatments in the coolant, and predict their static corrosion rate. The changes in the coolant and aluminum alloy were respectively monitored through pH value testing and corrosion surface morphology analysis, the corrosion kinetics parameters of the samples were measured through electrochemical methods, the corrosion rate and annual corrosion depth of the materials were obtained through weight loss experiments, and the corrosion products were analyzed through EDS. The pH of the coolant in all experimental groups showed an overall downward trend and the corrosion was clearly observed on the sample surface and concentrated at the defect location of the surface of sample. The corrosion rate of samples with different surface treatments varied, with a maximum difference of 16 times. The effective corrosion inhibitive components in the coolant participated in the formation of corrosion product films on the sample surface, depositing elements such as P and Ca on the surface. It is concluded that the annual corrosion depth of 3D printed aluminum alloy material in the coolant is relatively low, and its corrosion resistance is good, and liquid abrasive polishing or acid washing treatment can reduce the static corrosion rate of the investigated material in the coolant.