Hot pressing of DCPD-coated Mg-Zn-Ca powder: Corrosion behavior observed using liquid cell transmission electron microscopy

Meng-Hsiu Tsai; Chia-Ming Yang; Yen-Hsi Chen; In-Gann Chen; Chiu-Feng Lin; Chun-Chieh Tseng

Materials & Design (Feb 2023)

Hot pressing of DCPD-coated Mg-Zn-Ca powder: Corrosion behavior observed using liquid cell transmission electron microscopy

Meng-Hsiu Tsai,
Chia-Ming Yang,
Yen-Hsi Chen,
In-Gann Chen,
Chiu-Feng Lin,
Chun-Chieh Tseng

Affiliations

Meng-Hsiu Tsai: Department of Mold and Die Engineering, National Kaohsiung University of Science and Technology, No. 415, Jiangong Rd., Sanmin Dist., Kaohsiung 807, Taiwan; School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, No. 100, Shih-Chuan 1st Road, Sanmin Dist., Kaohsiung City 80708, Taiwan
Chia-Ming Yang: Department of Materials Science and Engineering, National Cheng Kung University, No. 1, University Road, Tainan City 701, Taiwan
Yen-Hsi Chen: Department of Materials Science and Engineering, National Cheng Kung University, No. 1, University Road, Tainan City 701, Taiwan
In-Gann Chen: Department of Materials Science and Engineering, National Cheng Kung University, No. 1, University Road, Tainan City 701, Taiwan
Chiu-Feng Lin: Metal Industries Research & Development Centre, 1001 Kaonan Highway, Nanzi Dist., Kaohsiung 811, Taiwan
Chun-Chieh Tseng: Metal Industries Research & Development Centre, 1001 Kaonan Highway, Nanzi Dist., Kaohsiung 811, Taiwan; Combination Medical Device Technology Division, Medical Devices R&D Service Department, Metal IndustriesResearch & Development Centre, Kaohsiung 802, Taiwan; Corresponding author.

Journal volume & issue: Vol. 226
p. 111643

Abstract

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Mg-Zn-Ca alloys are considered potential implant materials for bone repair owing to their excellent biocompatibility and biodegradability. Typically, a dicalcium phosphate dihydrate (CaHPO4·2H2O, DCPD) coating and powder metallurgy process are adopted for biodegradable medical devices. Many literatures reported that Mg alloy surface with DCPD coating served as a barrier against the corrosion environment. However, the corrosion rate increased due to the surface coating destroyed. In this article we investigated the corrosion behavior in inter-granular powder boundary with Ca-P coating which fabricated with the DCPD-coated Mg-Zn-Ca powder using sequential hot pressing. Corrosion behavior was evaluated with hydrogen release, immersion test in DI water and liquid cell transmission electron microscopy (TEM). Hydrogen bubble rupture causing initiation of crack in the Ca-P-Mg film, showing the better corrosion resistance. In addition, the primary intermetallic (IM1) phase resisted the crack propagation that occurred on both coated and uncoated specimens. Liquid cell TEM was used to observe the time-dependent composition and crystalline changes in immersion test. The IM1 phase and Ca-P coating would enhance corrosion resistance was evaluated in less Mg element loss and destroyed crystalline. The results indicate that the Ca-P coating can decelerate the degradation of hot-pressed Mg-Zn-Ca alloys in DI water.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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