Improvement of corrosion fatigue strength of magnesium alloy by multilayer diamond-like carbon coatings
Improvement of corrosion fatigue strength of magnesium alloy by multilayer diamond-like carbon coatings
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DOI：
10.1016/j.surfcoat.2010.10.040
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发表时间：
2011-01-25
影响因子：
5.4
通讯作者：
Tokaji, Keiro
中科院分区：
文献类型：
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作者：
Uematsu, Yoshihiko;Kakiuchi, Toshifumi;Tokaji, Keiro
研究了总厚度为3μm和12μm的多层类金刚石碳(DLC)薄膜AZ80A变形镁合金在实验室空气和蒸馏水中的疲劳行为。讨论了多层DLC薄膜对疲劳和腐蚀疲劳行为的影响。在实验室空气中，与同等膜厚的单层DLC涂层样品相比，多层DLC涂层样品的疲劳强度显着提高。疲劳裂纹在薄膜缺陷下的基体处萌生。多层 DLC 涂层样品的较高疲劳强度可能归因于薄膜中较小的缺陷尺寸。然而，单层薄膜和多层3μm DLC薄膜不能提高蒸馏水中的腐蚀疲劳强度。在薄膜中发现了缺陷，腐蚀性水可以通过这些缺陷到达基材。在多层12μm DLC涂层样品中没有发现腐蚀环境下疲劳强度的降低，这表明厚的多层DLC涂层作为保护膜是有效的。通过厚多层制造工艺成功消除了贯穿膜厚的缺陷。 (C) 2010 年爱思唯尔作者。版权所有。
The fatigue behaviour of a wrought magnesium alloy AZ80A coated with multilayer diamond-like carbon (DLC) films with the total thicknesses of 3 mu m and 12 mu m was studied in laboratory air and distilled water. The effects of the multilayer DLC films on fatigue and corrosion fatigue behaviour were discussed. In laboratory air, the fatigue strengths of the multilayer DLC-coated specimens significantly increased compared with those of the single layer DLC-coated ones with equivalent film thicknesses. Fatigue cracks initiated at the substrate under the defects of the film. Higher fatigue strengths of the multilayer DLC-coated specimens could be attributed to the smaller defect size in the film. However, the single layer films and the multilayer 3 mu m DLC film could not improve corrosion fatigue strength in distilled water. The defects were found in the films, through which the corrosive water could reach the substrate. The degradation of fatigue strength under the corrosive environment was not recognized in the multilayer 12 mu m DLC-coated specimens, indicating that the thick multilayer DLC coating was effective as a protection film. Through-film thickness defects were successfully removed by the thick multilayer fabrication process. (C) 2010 Elsevier By. All rights reserved.