Effect of Sulfuric Acid Anodizing on Mechanical Properties of 2E12 Al-alloy

doi:10.11902/1005.4537.2017.205

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (6): 579-586 DOI: 10.11902/1005.4537.2017.205

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Effect of Sulfuric Acid Anodizing on Mechanical Properties of 2E12 Al-alloy

Gaohong CHEN¹(

),Yuansen HU²,Mei YU²,Jianhua LIU²,Guoai LI¹

1. Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications, Beijing Institute of Aeronautical Materials, Beijing 100095, China
2. School of Materials Science and Engineering, Beihang University, Beijing 100191, China

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Abstract

2E12 Al-alloys without and with an Al-clad layer were treated via the traditional sulfuric acid anodizing process, so that an anodic oxide film was prepared on their surface. The effect of the Al-clad layer and anodic oxidation time on the surface morphology and mechanical properties of the anodic oxide films was investigated by means of morphological characterization, tensile property test and fatigue life test. The results showed that the dissolution of the second phase in the matrix of 2E12 Al-alloys can result in the formation of voids on the surface oxide film during the anodic oxidation process. With the increasing oxidation time, the thickness of the oxide film gradually increases, whilst the number and size of voids also increase. After sulfuric acid anodizing, the tensile property of 2E12 Al-alloy keeps basically unchanged, but the fatigue life decreases obviously. For the sulfuric acid anodized 2E12 Al-alloy without Al-clad layer, the fatigue life decreases to 30% of that for the counterpart . After the anodic oxidation treatment, the fatigue cracks originate from the defects of the oxide film surface, and the fatigue fracture shows multiple crack characteristics.

Key words: aerospace aluminum alloy sulfuric acid anodic oxidation fatigue life Al-clad layer

Received: 29 November 2017

ZTFLH:

TG174.451

Corresponding Authors: Gaohong CHEN E-mail: 18611641263@163.com

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Cite this article:

Gaohong CHEN,Yuansen HU,Mei YU,Jianhua LIU,Guoai LI. Effect of Sulfuric Acid Anodizing on Mechanical Properties of 2E12 Al-alloy. Journal of Chinese Society for Corrosion and protection, 2018, 38(6): 579-586.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2017.205 OR https://www.jcscp.org/EN/Y2018/V38/I6/579

Table 1 Chemical compositions of metal pretreatment solutions, processing time and temperature

Fig.1 Schematic diagram of tensile specimen (unit: mm)

Fig.2 Schematic diagram of fatigue specimen (unit: mm)

Fig.3 Thicknesses of anodization films of unclad and alcl-ad 2E12 Al-alloy as a function of time

Fig.4 Surface SEM images of unclad (a1~d1) and alclad (a2~d2) 2E12 Al-alloy after anodization for 15 min (a1, a2), 30 min (b1, b2), 45 min (c1, c2) and 60 min (d1, d2)

Table 2 Tensile properties of unclad and alclad 2E12 Al-alloy before and after anodizing

Table 3 Fatigue life of unclad 2E12 Al-alloy anodized for different time

Table 4 Fatigue life of alclad 2E12 Al-alloy anodized for different time

Fig.5 Fatigue relative lifes of unclad (a) and alclad (b) 2E12 Al-alloy

Fig.6 Fracture morphologies of unclad (a1~a5) and alclad (b1~b5) 2E12 Al-alloy anodized for 0 min (a1, b1), 15 min (a2, b2), 30 min (a3, b3), 45 min (a4, b4) and 60 min (a5, b5)

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