Electrochemical corrosion protection of neat and zinc phosphate modified epoxy coating: A comparative physical aging study on Al alloy 6101

Ahsan Riaz Khan; Hai-Jun Zhang; Zhang Jun; Zheng Maosheng; Sayed M Eldin; Imran Siddique

doi:10.3389/fchem.2023.1142050

Electrochemical corrosion protection of neat and zinc phosphate modified epoxy coating: A comparative physical aging study on Al alloy 6101

Front Chem. 2023 Feb 14:11:1142050. doi: 10.3389/fchem.2023.1142050. eCollection 2023.

Authors

Ahsan Riaz Khan^{1

2

3}, Hai-Jun Zhang^{1

2}, Zhang Jun^{4

5}, Zheng Maosheng³, Sayed M Eldin⁶, Imran Siddique⁷

Affiliations

¹ Department of Interventional and Vascular Surgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China.
² National United Engineering Laboratory for Biomedical Material Modification, Branden Industrial Park, Qihe Economic and Development Zone, Dezhou City, Shandong, China.
³ Department of Chemical Engineering, Northwest University, Xi'an, China.
⁴ Research Center for Translational Medicine, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai, China.
⁵ Shanghai Institute of Stem Cell Research and Clinical Translation, Shanghai, China.
⁶ Center of Research, Faculty of Engineering, Future University in Egypt, New Cairo, Egypt.
⁷ Department of Mathematics, University of Management and Technology, Lahore, Pakistan.

Abstract

Optimizing the pigment volume concentration of zinc phosphate pigments can protect Al alloy 6101 from alkaline media. Additionally, zinc phosphate pigments form a shielding film on the substrate and facilitate stopping the penetration of aggressive corrosion ions. The efficiency of eco-friendly zinc phosphate pigments is almost 98% during the corrosion analysis. A comparative study of physical aging of neat epoxy and Zinc Phosphate (ZP) pigment-modified epoxy coatings on Al alloy 6101 was conducted in Xi'an, China, for one year in all four seasons, where in summer for 3 months, results degraded more due to high UV radiation and humidity; it is found that peeling force of ZP pigments modified epoxy coatings is 50% higher of than that of the neat epoxy coatings though both peel-off adhesion strength and scratch test visibility decreased in both coatings; The electrochemical resistance of ZP pigments modified epoxy coatings is about 30% higher of than that of neat epoxy coatings, the corrosion rate of ZP pigments modified epoxy coatings is about 70% lower of than that of neat epoxy coatings, moreover the gloss retention is 20% higher in the modified epoxy; Optical surface observation of the coatings showed that the ZP modified epoxy coating could effectively restrict the crack and shrinkage in coatings after aging experimentation in the natural environment.

Keywords: corrosion resistance; electrochemical analysis; modified epoxy; physical aging; zinc phosphate.

Grants and funding

This research has been funded by Shaanxi Province Key Research Fund under the grant number 2019GY-157 and by the Wisteria Scientific Research Cooperation Special Project of Northwest University, China.