Microwave assisted deposition of hydroxyapatite coating on a magnesium alloy with enhanced corrosion resistance

• Published in: Materials letters Vol. 159; pp. 146 - 149
• Main Authors: Shen, Sibo, Cai, Shu, Zhang, Min, Xu, Guohua, Li, Yan, Ling, Rui, Wu, Xiaodong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.11.2015
• Subjects: Coating; Corrosion; Corrosion resistance; Deposition; Heating; Hydroxyapatite; Magnesium alloy; Magnesium base alloys; Microstructure; Microwave; Microwaves; Protective coatings; Microwave; Hydroxyapatite; Corrosion; Microstructure; Magnesium alloy
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2015.06.096

In this work, a thick, dense and uniform microstructural hydroxyapatite coating was deposited on a magnesium alloy in an aqueous solution under microwave irradiation at 100°C in a short time of 10min. The results showed that the high driving force of interfacial growth under microwave irradiation greatly promoted the growth of hydroxyapatite nuclei into rod-like crystals, and the thickness of obtained hydroxyapatite coating was ∼9.9μm, larger than that of ∼6.3μm derived by water-bath heating. The coating derived by microwave heating offered preferable corrosion resistance for the magnesium alloy compared with the coating derived by water-bath heating. The corrosion current density of the coated magnesium alloy was reduced by 100-fold as compared to the naked magnesium alloy. •A thick and uniform hydroxyapatite coating was deposited on Mg alloy by microwave.•Rod-like hydroxyapatite crystals were formed under microwave irradiation.•The obtained hydroxyapatite coating offered high corrosion resistance for Mg alloy.•The thickness of hydroxyapatite coating derived by microwave heating was ∼9.9μm.