Corrosion,wear and wear–corrosion behavior of graphite-like a-C:H films deposited on bare and nitrided titanium alloy |
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| Affiliation: | 1. Physics Department, Federal University of Ouro Preto, Campus Universitário Morro do Cruzeiro ICEB/DEFIS, 35400-000, Ouro Preto, Minas Gerais, Brazil;2. Physics Department, Federal University of Minas Gerais, Av. Antonio Carlos 6627, 31270-901, Belo Horizonte, Minas Gerais, Brazil;3. Metallurgy Department, Laboratory of Corrosion Research, Federal University of Rio Grande do Sul, Av. Bento Gonçalves 9500/75/232, 91501-970, Porto Alegre, Rio Grande do Sul, Brazil;1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. College of Mechanical and Electrical Engineering, Nanjing Forestry University, Nanjing 210037, China;3. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;4. Advanced Coatings Applied Research Laboratory, Department of Mechanical and Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, China |
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| Abstract: | This work presents a comparative wear, corrosion and wear–corrosion (the last one in a simulated physiological solution) study of graphite-like a-C:H (GLCH) films deposited on bare and nitrided Ti6Al4V alloy. Films, deposited by r.f. PACVD, presented low porosity and promoted high corrosion resistance. The friction coefficient of the films was very low with appreciable wear resistance at room conditions. However, due to the simultaneous action of both load and the corrosive environment in wear–corrosion tests a marked reduction in the coating lifetime was observed. Unexpectedly, films deposited on the nitrided alloy presented a lifetime at least ten times shorter than that of films on bare alloy. We explain such a result in terms of film/substrate interaction. The weak GLCH/nitrided alloy interaction facilitates fluid penetration between the film and the substrate which leads to a fast film delamination. Such an interpretation is supported by force curve measurements, which show that the interaction between GLCH and nitrided alloy is four times weaker than that between GLCH and bare alloy. |
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