Preparation and Corrosion Resistance of Superhydrophobic Coatings on 7005 Aluminum Alloy

Author:

Huang Huilan12,Guo Feng34,Li Xintao12,Xia Peng5,Yang Li1,Hu Chuanbo36ORCID

Affiliation:

1. Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510650, China

2. Jiangxi Universal New Materials Lightweight Industrial Technology Research Institute, Shangrao 334000, China

3. Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Chongqing 404100, China

4. Material Corrosion and Protection Key Laboratory of Sichuan Province, Zigong 643000, China

5. School of Material Science and Engineering, Dongguan University of Technology, Dongguan 523808, China

6. Department of Chemistry, Hong Kong Baptist University, Hong Kong 999077, China

Abstract

Composite coatings on the surface of a semi-continuous cast 7005 aluminum alloy under different aging treatments (T6, RRA, and FSA) are presented and characterized in this research. SiO2 combined with stearic acid (STA) modified by KH550 was utilized to achieve multifunctional superhydrophobic coatings. Adhesive tape adhesion, blade scratch, and mechanical wear tests were utilized to assess the durability of the superhydrophobic coatings. The results showed that the prepared coatings exhibited excellent superhydrophobicity, self-cleaning ability, and mechanical properties, especially the T6 temper alloy. This alloy had the largest CA value (156.5°) and the lowest SA value (4.3°). The composite coatings still exhibited excellent superhydrophobicity under mechanical damage. Furthermore, the alloys with STA/SiO2 displayed marvelous corrosion resistance efficiency. The T6 temper alloy with a protection rate of 73.8% had an approximately one-order-of-magnitude decrement in carrion current density. The composite coating can be effectively utilized in various industrial fields, thus extending its potential impact.

Funder

Applied Foundation Research of Guangdong Province

National Natural Science Foundation of China

Unveiling and Leading Major Technical Demand Project

National Key Research and Development Program of China

Publisher

MDPI AG

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