Development of anti-local corrosion apatite-biodegradable polymer composite coatings for bioabsorbable Mg alloys

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420742
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Composite materials/Surface and interface engineering
• Research Institution: National Institute for Materials Science
• Principal Investigator: Hiromoto Sachiko 国立研究開発法人物質・材料研究機構, 生体機能材料ユニット, MANA研究者 (00343880)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: マグネシウム / リン酸カルシウム / 生分解性高分子 / 複合化被膜 / 親疎水性 / 腐食 / 疑似体液

Outline of Final Research Achievements

We previously developed hydroxyapatite (HAp) and octacalcium phosphate (OCP) coatings to control the corrosion of bioabsorbable/biodegradable magnesium (Mg) alloys. In this study, polymer and calcium phosphate (Ca-P) composite coatings were formed to prevent local corrosion of Ca-P-coated Mg alloy. First, poly-L-lactic acid (PLLA) and polycaprolactone (PCL) were used, but these hydrophobic polymers did not show enough adhesiveness to Ca-P coating, leading to the corrosion under the polymer layer. Hydrophilic polymer (HPpolym) and Ca-P composite coating showed slightly lower corrosion protectiveness than Ca-P coating. An interesting finding of this study was that HPpolym coating improved corrosion resistance of Mg alloy in cell culture medium.

Free Research Field

腐食防食科学