Effect of Alkali Etching Process on Properties of Room Temperature Hard Anodized Film of Aluminum Alloy

WANG Qi, ZHANG Yinhang, ZHANG Xiaoyun

doi:10.16577/j.issn.1001-1560.2023.0256

Today is Email Alert　 RSS

Materials Protection >

2023 , Vol. 56 >Issue 10: 161 - 165

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0256

Effect of Alkali Etching Process on Properties of Room Temperature Hard Anodized Film of Aluminum Alloy

Expand

(College of Materials Science and Engineering， China University of Petroleum， Qingdao 266580， China)

Received date: 2023-03-23

Revised date: 2023-04-12

Accepted date: 2023-05-20

Online published: 2023-10-15

Fold

Abstract

In order to improve the performance of aluminum alloy and optimize the anodizing process， with using sulfuric acid as the electrolyte，the normal temperature hard anodizing method was used to prepare an oxide film on the surface of 6063 aluminum alloy.Subsequently，the film performance and the effect of the alkali etching process on the film performance were studied by scanning electron microscopy， EDS testing， electrochemical testing， salt spray testing， hardness testing， and roughness testing.Results showed that under the conditions of oxidation temperature of 10 °C and oxidation time of 3 000 s， the as-obtained hard anodized film had an uneven and rough porous structure， and its corrosion resistance and physical properties were greatly improved compared to the 6063 aluminum alloy substrate.The self-corrosion potential of the hard anodized film after alkali etching treatment was－0.826 V，and the self-corrosion current was 3.892×10－6 A.No corrosion points appeared in the salt spray test for 360 h， and the corrosion resistance was good.Meanwhile， the film possessed the Vickers hardness reaches of 446 HV，the roughness Ra of 0.380 μm，the thickness of 18.86 μm，and the excellent adhesion performance.Compared with the film obtained without alkali etching， the film after alkali etching had the better corrosion resistance and physical properties such as hardness and surface roughness.

Key words： alkalietching; room temperature hard anodizing; sulfuric acid method; corrosion resistance

Cite this article

WANG Qi, ZHANG Yinhang, ZHANG Xiaoyun . Effect of Alkali Etching Process on Properties of Room Temperature Hard Anodized Film of Aluminum Alloy[J]. Materials Protection, 2023 , 56(10) : 161 -165 . DOI: 10.16577/j.issn.1001-1560.2023.0256

References

[1] 戴一帆，沈士泰，卢洁琴，等.2024 铝合金混合酸阳极氧化[J].表面技术， 2018， 47(1): 198－202.DAI Y F， SHEN S T， LU J Q， et al.2024 Aluminum alloy anodic oxidation in mixed acid[J].Surface Technology，2018， 47(1): 198－202.

[2] 吴英豪，赵文杰，王武荣，等.铝合金表面微/纳米结构构筑研究进展[J].表面技术， 2017， 46(5): 133－145.WU Y H， ZHAO W J， WANG W R， et al.Research progress in fabricating micro/nano structures on aluminum alloys surface [J].Surface Technology， 2017， 46 (5):133－145.

[3] PATERMARAKIS G.Aluminium anodising in low acidity sulphate baths: growth mechanism and nanostructure of porous anodic films[J].Journal of Solid State Electrochemistry， 2006， 10(4): 211－222.

[4] 周和荣，李晓刚，董超芳.铝合金及其氧化膜大气腐蚀行为与机理研究进展[J].装备环境工程， 2006(1):1－9.ZHOU H R， LI X G， DONG C F.Review of atmospheric corrosion behavior and mechanism of aluminum alloys and its anodic film [J].Equipment Environmental Engineering，2006(1): 1－9.

[5] OSMAN M.Corrosion inhibition ofaluminium-brass in 3.5%NaCl solution and sea water[J].Materials Chemistry and Physics， 2001， 71(1): 12－16.

[6] 曾鑫龙，王春霞，蔡肖涵，等.温度对2A12 铝合金硬质阳极氧化膜性能的影响[J].电镀与精饰， 2018， 40(9):6－9.ZENG X L， WANG C X， CAI X H， et al.Effect of temperature on the properties of hard anodized film of 2A12 aluminum alloy[J].Plating ＆ Finishing， 2018， 40(9): 6－9.

[7] 张丽，付国燕，陆江银，等.3003 铝合金低温硫酸硬质阳极氧化[J].电镀与涂饰， 2018， 37(3): 113－121.ZHANG L， FU G Y， LU J Y， et al.Hard anodization of 3003 aluminum alloy in sulfuric acid at low temperature[J].Electroplating ＆ Finishing， 2018， 37(3): 113－121.

[8] 高丽，黎学明，李武林，等.LY12 铝合金低温硬质阳极氧化工艺研究[J].表面技术， 2010， 39(6): 90－92.GAO L， LI X M， LI W L， et al.Process of hard anodic oxidation films on LY12 aluminum alloy at low temperature[J].Surface Technology， 2010， 39(6): 90－92.

[9] 安思宇，吕威，李雪松.硫酸电解液中铝合金硬质阳极氧化膜的表面形貌及性能研究[J].电镀与环保，2020， 40(3): 50－52.AN S Y， LV W， LI X S.Study on surface morphology and properties of hard anodic oxidation film on aluminum alloy prepared in sulfuric acid electrolyte[J].Electroplating ＆Pollution Control， 2020， 40(3): 50－52.

[10] 梁广，朱胜，王文宇，等.铝合金腐蚀防护技术研究现状及发展趋势[J].材料导报， 2020， 34(增刊2):1 429－1 436.LIANG G， ZHU S， WANG W Y， et al.Research status and development trend of aluminum alloy anticorrosion technology[J].Materials Reports， 2020， 34(S2): 1 429－1 436.

[11] 杨培霞，安茂忠.预处理工艺对制备多孔阳极氧化铝膜的影响[J].材料工程， 2005(9): 26－29.YANG P X， AN M Z.Influence of pretreatment on preparation of porous anodic alumina film[J].Journal of Materials Engineering， 2005(9): 26－29.

[12] 易俊兰，吴松林，刘明辉，等.前处理对化学转化处理铝锂合金耐蚀性的影响[J].表面技术， 2013， 42(1):42－45.YI J L， WU S L， LIU M H， et al.Influence of pretreatment on corrosion resistance of chromate conversion coated aluminum-lithium alloy[J].Surface Technology， 2013， 42(1):42－45.

[13] 张红军.铝合金硬质阳极氧化前处理工艺改进[J].电镀与涂饰， 2015， 34(13): 737－740.ZHANG H J.Improvement of pretreatment process for hard anodic oxidation of aluminum alloy[J].Electroplating ＆Finishing， 2015， 34(13): 737－740.

[14] 周芝凯，宋丹，王国威，等.铝合金阳极氧化的研究进展[J].热加工工艺， 2020， 49(18): 8－11.ZHOU Z K， SONG D， WANG G W， et al.Research development of anodizing of aluminum alloys[J].Hot Working Technology， 2020， 49(18): 8－11.

Options

Outlines

〈

〉

模态框（Modal）标题

Abstract

Cite this article

References