Preparation and Properties of Zr-based Conversion Coating on 2A12 Al-alloy

doi:10.11902/1005.4537.2020.216

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (1): 101-109 DOI: 10.11902/1005.4537.2020.216

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Preparation and Properties of Zr-based Conversion Coating on 2A12 Al-alloy

YU Hongfei¹^,², SHAO Bo³, ZHANG Yue¹, YANG Yange²(

)

^1.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
^2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Ansteel Engineering Technology Co. , Ltd. , Anshan 114021, China

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Abstract

A Cr-free Zr-based conversion coating (ZrCC) was prepared on 2A12 Al-alloy, which then was characterized in terms of the surface micromorphology evolution and composition of 2A12 Al-alloy during pretreatment and conversion process, especially, the influence of the second phase of the alloy on the conversion process. The results show that first, the pretreatment process resulted in a very rough surface of the 2A12 Al-alloy, on which there exist many pits and residual second phases; next, the second phase particulates in 2A12 Al-alloy were unfavorable to the uniform nucleation and growth of conversion coating granulates during conversion process; and third, after conversion process, the second phase particulates on the 2A12 Al-alloy surface were seriously destroyed, that brough strong impact on the compactness and uniformity of the coating.

Key words: conversion coating Zr-based aluminium Al-alloy corrosion second phase

Received: 27 October 2020

ZTFLH:

TG174

Fund: National Key R&D Program of China(2019YFC0312100);Civil Aircraft Special Scientific;Research Project(MJ-2017-J-99)

Corresponding Authors: YANG Yange E-mail: ygyang@imr.ac.cn

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YU Hongfei, SHAO Bo, ZHANG Yue, YANG Yange. Preparation and Properties of Zr-based Conversion Coating on 2A12 Al-alloy. Journal of Chinese Society for Corrosion and protection, 2021, 41(1): 101-109.

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https://www.jcscp.org/EN/10.11902/1005.4537.2020.216 OR https://www.jcscp.org/EN/Y2021/V41/I1/101

Fig.1 Polarization curves of bare 2A12 and Zr-based conv-ersion coating

Fig.2 Nyquist plot (a) and Bode plot (b) of bare 2A12 Al-alloy and ZrCC

Fig.3 EIS equivalent circuit of bare 2A12 Al-alloy and ZrCC

Table 1 Electrochemical fitting parameters of bare 2A12 Al-alloy and ZrCC

Fig.4 SEM micrograph and EDS mapping scans of 2A12 aluminium alloy: (a) substrate, (b) Al, (c) Cu, (d) Fe, (e) Mg, (f) Mn

Fig.5 Micrographs among pretreatment: (a) alkaline cleaning, (b) acid cleaning

Fig.6 EDS results of different position after acid pickling: (a) substrate, (b) position 1, (c) position 2, (d) position 3

Fig.7 OCP curve of 2A12 aluminium alloy immersed in the zirconium-based conversion bath as function vs the immersion time

Fig.8 SEM morphologies of ZrCC formed on 2A12 aluminium alloy after different immersion time in the conversion bath: (a1, a2) 75 s, (b1, b2) 175 s, (c1, c2) 270 s, (d1, d2) 1030 s, (e1, e2) 1800 s

Fig.9 SEM surface (a) and cross section (b) micrographs after conversion process

Table 2 Composition of surface and cross section of ZrCC by EDS (mass fraction / %)

Fig.10 Survey XPS spectra of ZrCC on 2A12 aluminium alloy

Fig.11 High resolution XPS spectra of different element of ZrCC on 2A12 aluminium alloy: (a) Al 2p, (b) F 1s, (c) Na 1s, (d) P 2P, (e) Zr 3d, (f) O 1s

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