Corrosion Behavior and Microstructure of Pd Ions Doped Cerium Conversion Coating on AA2219-T87 Aluminum Alloy

Abstract:

In this paper, Pd ions doped cerium conversion coating (CeCC/Pd) was deposited on AA2219-T87 aluminum alloy by electroplating. The microstructure and composition of the coating were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). Corrosion behavior of AA2219-T87 aluminum alloy with the coating was investigated in 3.5wt.% NaCl solution at the room temperature. XRD and XPS results indicate the existence of cerium-oxide and palladium-oxide in the CeCC/Pd. Polarization curves show that the CeCC/Pd exhibits excellent corrosion resistance. The corrosion current density of the CeCC/Pd decreases by two orders of magnitude compared with the CeCC. The improvement of corrosion resistance would be attributed to the small grain size, good compactness and adhesive strength of the composite coatings.

• Periodical: Advanced Materials Research (Volume 1090)
• Pages: 79-83
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1090.79
• Online since: February 2015
• Authors: Yan Hong He, Zhen Duo Cui, Xian Jin Yang, Sheng Li Zhu, Zhao Yang Li, Yan Qin Liang*
• Keywords: Aluminium Alloy, Cerium Conversion Coating, Corrosion Resistance, Pd Ions Doped

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