Artificial Skin with Fast and Robust Self-Healing Ability for Durable Intelligent Protection of Magnesium Alloys

35 Pages Posted: 24 Jun 2022

See all articles by Lei Liu

Lei Liu

Chongqing University

Jinglei Lei

Chongqing University

Ting Liu

Chongqing University

Bo Shang

Chongqing University

Jianxin He

Southwest Technology and Engineering Research Institute

Fusheng Pan

Chongqing University - National Engineering Research Center for Magnesium Alloys

Lingjie Li

Chongqing University

Abstract

Imitating the self-healing behavior of the skin of living organisms to damage, the artificial skin with fast and robust self-healing ability that can provide durable intelligent protection for magnesium alloys was elaborately designed and fabricated in this work. The as-prepared artificial skin has two-layers, and the thin bottom layer is a hydrothermal film composed of magnesium (hydr)oxides and the thick top layer is a uniform and compact polyethyleneimine (PEI) - polyacrylic acid (PAA) polymer film that was fabricated by layer-by-layer (LBL) assembly method. The artificial skin can heal the cuts of 25 μm-120 μm within 25 min under moist atmosphere even with high concentrations of aggressive Cl-. More importantly, the skin shows exceptional self-healing robustness to various severe damage (including repeated cutting/scratching, high temperature and organic-solvent immersion). The molecular dynamics method was used to simulate the dynamic self-healing process of the artificial skin, which elucidates that the self-healing mechanism of the as-prepared artificial skin is mainly related to the special reversible interaction among polymer molecules under humidity. This work may not only boost the application of magnesium alloys in harsh environments, but also provide a novel way for durable intelligent protection of metallic materials.

Keywords: Artificial skin, Magnesium alloy, Protection, self-healing, Robustness

Suggested Citation

Liu, Lei and Lei, Jinglei and Liu, Ting and Shang, Bo and He, Jianxin and Pan, Fusheng and Li, Lingjie, Artificial Skin with Fast and Robust Self-Healing Ability for Durable Intelligent Protection of Magnesium Alloys. Available at SSRN: https://ssrn.com/abstract=4145278 or http://dx.doi.org/10.2139/ssrn.4145278

Lei Liu

Chongqing University ( email )

Shazheng Str 174, Shapingba District
Shazheng street, Shapingba district
Chongqing 400044, 400030
China

Jinglei Lei

Chongqing University ( email )

Shazheng Str 174, Shapingba District
Shazheng street, Shapingba district
Chongqing 400044, 400030
China

Ting Liu

Chongqing University ( email )

Shazheng Str 174, Shapingba District
Shazheng street, Shapingba district
Chongqing 400044, 400030
China

Bo Shang

Chongqing University ( email )

Shazheng Str 174, Shapingba District
Shazheng street, Shapingba district
Chongqing 400044, 400030
China

Jianxin He

Southwest Technology and Engineering Research Institute ( email )

Chongqing
China

Fusheng Pan

Chongqing University - National Engineering Research Center for Magnesium Alloys ( email )

Lingjie Li (Contact Author)

Chongqing University ( email )

Shazheng Str 174, Shapingba District
Shazheng street, Shapingba district
Chongqing 400044, 400030
China

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