Study on Surface Passivation Process and Corrosion Resistance of Passive Film on 5052 Aluminum Alloy

CHEN Er - jun, DANG Lu - wei

doi:10.16577/j.issn.1001-1560.2022.0018

Materials Protection >

2022 , Vol. 55 >Issue 1: 142 - 146

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0018

Study on Surface Passivation Process and Corrosion Resistance of Passive Film on 5052 Aluminum Alloy

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Automobile Engineering Institute，Shaanxi Heavy Duty Truck Co., Ltd., Xi’an 710200, China

Received date: 2021-07-30

Revised date: 2021-08-25

Accepted date: 2021-09-23

Online published: 2023-12-24

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Abstract

In order to improve the surface corrosion resistance of automotive aluminum alloy components, the chemical passivation of chromium sulfate was selected to study the surface passivation process and corrosion resistance of passive film of 5052 aluminum alloy. The influences of the Cr2(SO4)3 concentration, K2ZrF6 active agent concentration in passivation solution, and the passivation time on the passivation quality were investigated. In addition, the corrosion resistance of passive film was studied by neutral salt spray test and cupric sulfate dropping corrosion test. Results showed when the conditions were 1.0 g/L Cr2(SO4)3, 2.5 g/L K2ZrF6, and 3 min of the passivation time, the obtained passivation film was continuous, uniform, and had good gloss. The passive film met the requirements of 240 h salt spray test and had the best corrosion resistance, which could meet the anti - corrosion requirements of automotive aluminum alloy appearance parts.

Key words： aluminum alloys; chemical passivation; corrosion resistance

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CHEN Er - jun, DANG Lu - wei . Study on Surface Passivation Process and Corrosion Resistance of Passive Film on 5052 Aluminum Alloy[J]. Materials Protection, 2022 , 55(1) : 142 -146 . DOI: 10.16577/j.issn.1001-1560.2022.0018

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