Abstract In this study, the wear and corrosion characteristics of six-pass friction stir processed (FSPed) AA1050/mischmetal oxide nanocomposite (6PPA) was compared to six-pass FSPed sample without powder (6 PA) and annealed base metal (BM). Different wear characteristics, such as weight loss, wear rate and coefficient of friction (COF) were studied. In order to evaluate the corrosion resistance of samples, immersion and cyclic polarization tests were performed. In addition, worn and corroded surfaces were investigated by field emission scanning electron microscopy (FESEM). The result of pin on disk dry sliding wear test revealed that wear resistance improved by employing FSP through finer grain structure (6 PA sample) and by incorporation of mischmetal oxides (MMOs) through lubrication and load-bearing action of particles (6PPA sample). At the constant load of 30 N, COF decreased from 0.9 to 0.85 and 0.75, and weight loss from 7.4 to 5.7 and 4.5 mg/m × 10−3 for the BM, 6 PA, and 6PPA samples, respectively. According to FESEM study of the worn surfaces, the BM and 6 PA samples show an adhesive wear mechanism, however the wear mechanism changed to abrasive for 6PPA sample. Based on immersion test results, corrosion rate of BM reduced from 0.41 to 0.36 and 0.29 mpy for the 6 PA and 6PPA samples, respectively. Moreover, the results of cyclic polarization test and FESEM investigation showed improved pitting resistance of 6PPA sample.

中文翻译：

---

搅拌摩擦法制备的AA1050/混合金属氧化物表面纳米复合材料的腐蚀磨损行为

摘要 在本研究中，将六道搅拌摩擦处理 (FSPed) AA1050/混合金属氧化物纳米复合材料 (6PPA) 的磨损和腐蚀特性与无粉末 (6 PA) 和退火母材 (BM) 的六道 FSPed 样品进行了比较。研究了不同的磨损特性，例如重量损失、磨损率和摩擦系数 (COF)。为了评估样品的耐腐蚀性，进行了浸泡和循环极化试验。此外，通过场发射扫描电子显微镜（FESEM）研究磨损和腐蚀的表面。销盘干滑动磨损试验的结果表明，通过使用 FSP 通过更细的晶粒结构（6 PA 样品）和通过颗粒的润滑和承载作用（6PPA 样品）掺入混杂金属氧化物 (MMO) 来提高耐磨性。在 30 N 的恒定载荷下，BM、6 PA 和 6PPA 样品的 COF 分别从 0.9 减少到 0.85 和 0.75，重量损失从 7.4 减少到 5.7 和 4.5 mg/m × 10−3。根据磨损表面的 FESEM 研究，BM 和 6 PA 样品显示出粘附磨损机制，而 6PPA 样品的磨损机制变为磨料。根据浸泡试验结果，6 PA 和 6PPA 样品的 BM 腐蚀速率分别从 0.41 降低到 0.36 和 0.29 mpy。此外，循环极化测试和 FESEM 研究的结果表明 6PPA 样品的耐点蚀性有所提高。BM 和 6 PA 样品显示出粘附磨损机制，而 6PPA 样品的磨损机制变为磨料。根据浸泡试验结果，6 PA 和 6PPA 样品的 BM 腐蚀速率分别从 0.41 降低到 0.36 和 0.29 mpy。此外，循环极化测试和 FESEM 研究的结果表明 6PPA 样品的耐点蚀性有所提高。BM 和 6 PA 样品显示出粘附磨损机制，而 6PPA 样品的磨损机制变为磨料。根据浸泡试验结果，6 PA 和 6PPA 样品的 BM 腐蚀速率分别从 0.41 降低到 0.36 和 0.29 mpy。此外，循环极化测试和 FESEM 研究的结果表明 6PPA 样品的耐点蚀性有所提高。