Abstract Accidental damage on the diamond-like carbon (DLC) coating can have a great influence on the anticorrosion and tribological performances. In this study, DLC coating was deposited by a DC unbalanced magnetron sputtering technique. The scratch tests with different damage loads of 2, 10, 20, 30, 40 and 50 N were used to imitate the different types of accidental damage. The influence of different types of surface damage states on anticorrosion performance and scratch damage structures on tribological performance were studied and compared with those of the coating without damage. Cracking or spalling of the coating promotes the corrosion failure of the coating system and pitting corrosion of the stainless steel substrate, resulting in the deterioration of the corrosion protection effectiveness. With the damage increases from fine crack to complete failure, the corrosion resistance decrease obviously and the corrosion rate increases from 1.796 × 10−9 to 2.880 × 10−8 (A/cm2). The coating with an appropriate scratch structure as the sample S2 (scratch width of 0.012 mm and the ratio of the scratch width to the contact width is 0.033) can effectively avoid the softening of the coating surface caused by graphitization and collect the wear debris particles, resulting in the excellent tribological behaviors with the lowest wear rate of 1.848 × 10−16 m3/(N·m).

中文翻译：

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预制划痕意外损坏类金刚石碳涂层：防腐和摩擦学性能的实验探索

摘要 类金刚石碳（DLC）涂层的意外损坏会对防腐和摩擦学性能产生很大影响。在这项研究中，DLC 涂层是通过直流不平衡磁控溅射技术沉积的。采用2、10、20、30、40和50 N不同损伤载荷的划痕试验来模拟不同类型的意外损伤。研究了不同类型的表面损伤状态对防腐性能的影响以及划痕损伤结构对摩擦学性能的影响，并与未损伤涂层的情况进行了比较。涂层的开裂或剥落促进了涂层体系的腐蚀失效和不锈钢基体的点蚀，导致防腐效果变差。随着损伤从细裂纹到完全破坏，耐蚀性明显下降，腐蚀速率从1.796×10-9增加到2.880×10-8（A/cm2）。具有适当划痕结构的涂层如样品S2（划痕宽度为0.012 mm，划痕宽度与接触宽度之比为0.033）可有效避免石墨化引起的涂层表面软化并收集磨屑颗粒，产生优异的摩擦学性能，最低磨损率为 1.848 × 10−16 m3/(N·m)。