Surface characteristics and corrosion behaviour of WE43 magnesium alloy coated by SiC film

• Published in: Applied surface science Vol. 258; no. 7; pp. 3074 - 3081
• Main Authors: Li, M., Cheng, Y., Zheng, Y.F., Zhang, X., Xi, T.F., Wei, S.C.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.01.2012; Elsevier
• Subjects: Alloy plating; Chemical vapor deposition; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Corrosion; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Hemocompatibility; Hemolysis; Magnesium base alloys; PECVD; Physics; Platelets; SiC film; Silicon carbide; WE43 alloy; X-ray photoelectron spectroscopy; X-rays; SiC film; PECVD; Corrosion; Hemocompatibility; WE43 alloy; Silicon carbide; Inorganic compounds; Magnesium alloys; Film growth
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2011.11.040

Amorphous SiC film was successfully prepared on the surface of WE43 alloy by plasma enhanced chemical vapour deposition (PECVD) of CH4 and SH4. The immersion test indicated that SiC film could efficiently slow down the degradation rate of WE43 alloy and alleviate local alkalization in simulated body fluid (SBF) at 37±1°C (a and b) The indirect toxicity experiment was conducted using L929 cell line and the results showed that the extraction medium of SiC coated WE43 alloys exhibited no inhibitory effect on L929 cell growth (c). The in vitro hemocompatibility of the samples was investigated by hemolysis test and blood platelets adhesion test, and it was found that the hemolysis rate of WE43 alloy decreased after being coated by SiC and the platelets attached on the SiC film were slightly activated with a round shape (d). It could be concluded that SiC film prepared by PECVD made WE43 alloy more appropriate to biomedical application. [Display omitted] ► Amorphous SiC film has been successfully fabricated on the surface of WE43 magnesium alloy by PECVD. ► SiC film could efficiently slow down the degradation rate and alleviate local alkalization of WE43 alloy in simulated body fluid (SBF) at 37±1°C. ► It was found that the hemolysis rate of the SiC coated WE43 alloy decreased greatly. Amorphous SiC film has been successfully fabricated on the surface of WE43 magnesium alloy by plasma enhanced chemical vapour deposition (PECVD) technique. The microstructure and elemental composition were analyzed by transmission electron microscopy (TEM), glancing angle X-ray diffraction (GAXRD) and X-ray photoelectron spectroscopy (XPS), respectively. The immersion test indicated that SiC film could efficiently slow down the degradation rate of WE43 alloy in simulated body fluid (SBF) at 37±1°C. The indirect toxicity experiment was conducted using L929 cell line and the results showed that the extraction medium of SiC coated WE43 alloys exhibited no inhibitory effect on L929 cell growth. The in vitro hemocompatibility of the samples was investigated by hemolysis test and blood platelets adhesion test, and it was found that the hemolysis rate of the coated WE43 alloy decreased greatly, and the platelets attached on the SiC film were slightly activated with a round shape. It could be concluded that SiC film prepared by PECVD made WE43 alloy more appropriate to biomedical application.