A Lactoglobulin-Composite Self-Healing Coating for Mg Alloys

Abstract

Corrosion issue is one of the most crucial bottlenecks for extensive employment of Mg alloys, in particular under harsh engineering conditions. Differing from traditional approaches, a self-healing protective coating composed of lactoglobulin is proposed herein to offer sustainable protection to the underlying Mg parts. Corrosion resistance, evaluated by electrochemical measurements and hydrogen evolution tests, indicates that the lactoglobulin composite film exhibits nobler corrosion potential (−1.28 V SCE ), smaller corrosion current density (8.4 × 10 −6 A/cm 2 ), and lower average corrosion rate (∼0.03 mm/ y) than those of its bare counterparts. Moreover, the pre-made cracks in the film were evidently self-healed within 24 h of exposure to corrosive media. The proposed self-healing lactoglobulin composite film provides opportunities to tackle the corrosion challenges of Mg alloys.

Self-Healing Micro Arc Oxidation and Dicalcium Phosphate Dihydrate Double-Passivated Coating on Magnesium Membrane for Enhanced Bone Integration Repair

“…Self-healing coatings can provide a physical barrier effect and endow materials with biomimetic self-repairing functions . When self-healing coatings are damaged, repair agents are released and react with the environment to produce products to cover the substrates, hindering the defects from further expanding. − The emergence of self-healing coatings has improved the corrosion resistance of magnesium-based orthopedic materials and broadened their application prospects . Dicalcium phosphate dihydrate (DCPD), as an intermediate for bone mineralization, shows excellent biocompatibility and bone induction capability .…”