Corrosion Behavior of 9C Series of Powder Metallurgy Al-alloy with High Corrosion Resistance

doi:10.11902/1005.4537.2020.196

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (6): 775-785 DOI: 10.11902/1005.4537.2020.196

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Corrosion Behavior of 9C Series of Powder Metallurgy Al-alloy with High Corrosion Resistance

FANG Haojie¹^,²^,³, QU Hua²^,³, YANG Lihui³^,⁴, ZENG Qingya², WANG Lidan², YUAN Ning², HOU Baorong³^,⁴, CAO Lixin¹, YUAN Xundao²(

)

^1.School of Materials Science and Engineering, Ocean University of China, Qingdao 266011, China
^2.Qingdao Zhongke Institute of Applied Chemistry, Qingdao 266109, China
^3.Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
^4.Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

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Abstract

The 9C series Al-alloy is a kind of Al-alloy prepared by powder metallurgy technology. In order to provide a reference for the application of 9C series Al-alloy in the marine field, two grades of 9C series Al-alloy, 9C34 (extrusion forming) and 9C37 (molding forming) Al-alloy were compared with 5083 Al-alloy, especially in terms of corrosion performance. The mechanical properties of the three alloys were evaluated by tensile test and hardness test, and the effect of temperature and pH on the corrosion behavior of the alloys in different corrosive environments were comparatively investigated via salt spray tests, polarization curves measurement and electrochemical impedance spectroscopy. The results show that the strength (up to 550 MPa) and hardness (up to 130HB) of 9C Al-alloy are significantly better than that of 5083 Al-alloy. With excellent mechanical properties and high corrosion resistance, 9C series Al-alloy has obviously application prospect as corrosion-resistant structural materials.

Key words: Al-alloy powder metallurgy corrosion resistance corrosion behavior mechanical property

Received: 19 October 2020

ZTFLH:

TG17

Fund: Open Studio for Marine Corrosion and Protection Open Research Fund Project(HYFSKF-201803);Guangxi Innovation-driven Development Special Project (Major Science and Technology Special Project)(Guike AA18242035)

Corresponding Authors: YUAN Xundao E-mail: qdjy_yxd@sina.com

About author: YUAN Xundao, E-mail: qdjy_yxd@sina.com

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	Haojie FANG
	Hua QU
	Lihui YANG
	Qingya ZENG
	Lidan WANG
	Ning YUAN
	Baorong HOU
	Lixin CAO
	Xundao YUAN

Cite this article:

FANG Haojie, QU Hua, YANG Lihui, ZENG Qingya, WANG Lidan, YUAN Ning, HOU Baorong, CAO Lixin, YUAN Xundao. Corrosion Behavior of 9C Series of Powder Metallurgy Al-alloy with High Corrosion Resistance. Journal of Chinese Society for Corrosion and protection, 2021, 41(6): 775-785.

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https://www.jcscp.org/EN/10.11902/1005.4537.2020.196 OR https://www.jcscp.org/EN/Y2021/V41/I6/775

Fig.1 Stress-strain curves of three test Al-alloys

Table 1 Mechanical properties of three test Al-alloys

Fig.2 Macro morphologies of 9C34 (a1~a5), 9C37 (b1~b5) and 5083 (c1~c5) Al-alloys after salt spray corrosion for 0 h (a1~c1), 72 h (a2~c2), 144 h (a3~c3), 216 h (a4~c4) and 288 h (a5~c5)

Table 2 Average corrosion rate of three Al-alloys in the different periods of salt spray test (g·m^-2·h)

Fig.3 Polarization curves of three Al-alloys in simulated seawater with the pH8.3 at 25 ℃

Table 3 Fitting results of polarization curves

Fig.4 Nyquist plots and equivalent circuit of three Al-alloys in simulated seawater with pH8.3 at 25 ℃^[10]

Table 4 Fitting parameters of EIS of three Al-alloys in simulated seawater with pH8.3 at 25 ℃

Fig.5 Polarization curves of 9C34 (a), 9C37 (b) and 5083 (c) Al-alloys in simulated seawater with pH8.3 at different temperatures

Table 5 Fitting results of polarization curves of Al-alloys in simulated seawater with pH8.3 at different temperatures

Fig.6 Nyquist plots of 9C34 (a), 9C37 (b) and 5083 (c) Al-alloy in simulated seawater with pH8.3 at different temperatures

Table 6 Fitting results of EIS of three Al-alloys in simulated seawater with pH8.3 at different temperatures

Fig.7 Polarization curves of 9C34 (a), 9C37 (b) and 5083 (c) Al-alloy in simulated seawater with different pH values at 25 ℃

Table 7 Fitting results of polarization curves of three Al-alloys in simulated seawater with different pH values at 25 ℃

Fig.8 Nyquist plots of 9C34 (a), 9C37 (b) and 5083 (c) Al-alloys in simulated seawater with different pH values at 25 ℃

Fig.9 Equivalent circuits used to fit EIS for different Al-alloys in simulated seawater with different pH values: (a) for three Al-alloys, pH8.3; (b) for 9C37 and 5083 Al-alloys, pH5.0 and 7.0; for 9C34 Al-alloy, pH7.0; (c) for 9C34 Al-alloy, pH5.0^[25]

Table 8 Fitting results of EIS of three Al-alloys in simulated seawater with different pH values at 25 ℃

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