Growth behaviour of cerium-based conversion coating on HF pre-treated Zn–5%Al alloy. (3rd April 2021)

• Record Type: Journal Article
• Authors: Sun, Ziwen; Kong, Gang; Zhang, Shuanghong; Wang, Yanqi; Che, Chunshan
• Is Part Of: Surface engineering. Volume 37:Number 4(2021)
• Page Start: 455
• Page End: 463
• Publication Date: 2021-04-03
• Subjects: Zn–5% Al alloy -- cerium conversion coating -- hydrofluoric acid -- selective deposition -- corrosion resistance; Surfaces (Technology) -- Periodicals; Coatings -- Periodicals; 620.4405
• DOI: 10.1080/02670844.2020.1745366
• Languages: English
• ISSNs: 0267-0844

Abstract

ABSTRACT: The effects of HF pre-treatment on the cerium-based conversion coating on a Zn–5% Al alloy were investigated using a combination of scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and electrochemical impedance spectroscopy. The results revealed that a porous structure appeared in the Al-rich phase of Zn–5% Al alloy after HF pre-treatment, and the cerium conversion coating with pre-treatment was preferentially deposited on the surface of Al-rich phase and grew fast. Moreover, the corrosion resistance of the cerium conversion coating was improved by HF pre-treatment.