Exfoliation Corrosion Behavior of 2A02 Al-alloy in a Simulated Marine Atmospheric Environment

doi:10.11902/1005.4537.2017.178

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (5): 502-510 DOI: 10.11902/1005.4537.2017.178

Current Issue | Archive | Adv Search

Exfoliation Corrosion Behavior of 2A02 Al-alloy in a Simulated Marine Atmospheric Environment

Min CAO^1,², Li LIU¹(

), Zhongfen YU³, Ying LI¹, Fuhui WANG^1,³

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

Download:

HTML

PDF(8883KB)
Export: BibTeX | EndNote (RIS)

Abstract

The exfoliation corrosion behavior of 2A02 Al-alloy plates in a simulated marine atmospheric environment was studied by means of weight loss measurement. Namely, the plates were covered with a deposit of 4 mg/cm² solid NaCl and then tested at 60 ℃ in air with 72% humidity. The microstructure and corrosion products of the alloy were characterized by SEM, XPS, LSCM,TEM and EPMA etc. Results show that in the simulated marine atmospheric environment, the corrosion process of 2A02 Al-alloy experienced the following three successive stages, i.e. pitting corrosion, intergranular corrosion and exfoliation corrosion. It seems that the second phase particles, which situated at grain boundaries, may play a key role for the initiation of pitting corrosion, while the rapid diffusion of Cl^- along grain boundaries may act as a promoting factor for intergranular corrosion.

Key words: 2A02 Al alloy NaCl deposit simulated marine atmosphere exfoliation corrosion

Received: 02 November 2017

ZTFLH:

TG178

Fund: Supported by National Natural Science Foundation of China (51622106)

	Service

	E-mail this article
	Add to citation manager
	E-mail Alert
	RSS
	（）
	Articles by authors
	Min CAO
	Li LIU
	Zhongfen YU
	Ying LI
	Fuhui WANG

Cite this article:

Min CAO, Li LIU, Zhongfen YU, Ying LI, Fuhui WANG. Exfoliation Corrosion Behavior of 2A02 Al-alloy in a Simulated Marine Atmospheric Environment. Journal of Chinese Society for Corrosion and protection, 2018, 38(5): 502-510.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2017.178 OR https://www.jcscp.org/EN/Y2018/V38/I5/502

Fig.1 Metallographic morphology (a) and microstructure (b) of 2A02 Al alloy plate along rolling direction

Fig.2 Mass gain of 2A02 Al alloy during exposure under 4 mg/cm² solid NaCl deposit in 72%RH at 60 ℃

Table 1 EDS results of 2A02 Al alloy exposed under 4 mg/cm² solid NaCl deposit in 72%RH at 60 ℃ for different time

Fig.3 Surface morphologies of 2A02 Al alloy exposed under 4 mg/cm² solid NaCl deposit in 72%RH at 60 ℃ for 2 h (a), 24 h (b), 72 h (c), 120 h (d), 168 h (e) and 200 h (f)

Fig.4 Cross section morphologies of 2A02 Al alloy exposed under 4 mg/cm² solid NaCl deposit in 72%RH at 60 ℃ for2 h (a), 24 h (b), 72 h (c), 120 h (d), 168 h (e) and 200 h (f)

Fig.5 LSCM morphologies of 2A02 Al alloy substrate after removal of corrosion products formed under 4 mg/cm² solid NaCl deposit in 72%RH at 60 ℃ for 24 h (a), 120 h (b) and 200 h (c) and the depthes of corresponding corrosion pittings (d)

Fig.6 Cross-section morphologies of 2A02 Al alloy after corrosion under 4 mg/cm² solid NaCl deposit in 72%RH at 60 ℃ for 200 h (a) and the magnified images of the squear areas in Fig.6a (b) and Fig.6b (c)

Fig.7 EPMA maps of the elemental distribution in the cross-section of 2A02 Al alloy after corrosionunder 4 mg/cm² solid NaCl deposit in 72% humidity at 60 ℃ for 200 h

Table 2 EDS reuluts of points A and B in Fig.8c (atomic fraction / %)

Fig.8 TEM image of 2A02 Al alloy after removal off corrosion products under 4 mg/cm² solid NaCl deposit in 72%RH at 60 ℃ for 200 h (a), the content profiles of various elemtentsalong the red line (b), the magnifiedTEM image of the yellow virtual frame area in Fig. 8a (c),TEM morphology of grainboundary (d)

Fig.9 XPS spectrum of the corrosion products of 2A02 Al alloy after exposure in 72%RH and solid NaCl deposit condition at 60 ℃ for 200 h

Table 3 Density and Mol volume of each corrosion product

[1]	Szklarska-Smialowska Z.Pitting corrosion of aluminum[J]. Corros. Sci., 1999, 41: 1743
[2]	Nakazato R Z, Codaro E N, Horovistiz A L, et al.A metallurgical study of aluminium alloys used as aircraft components[J]. Prakt. Metallogr., 2001, 38A(2): 74
[3]	Ezuber H, El-Houd A, El-Shawesh F.A study on the corrosion behavior of aluminum alloys in seawater[J]. Mater. Des., 2008, 29: 801
[4]	Gudi? S, Smoljko I, Kli?ki? M.Electrochemical behaviour of aluminium alloys containing indium and tin in NaCl solution[J]. Mater. Chem. Phys., 2010, 121: 561
[5]	Fan L, Cai J P, Zhang Q.Corrosion behavior of LY12 aluminum alloy with cyclic immersion corrosion test[J]. J. Chin. Soc. Corros. Prot., 2009, 29: 215(范林, 蔡健平, 张琦. LY12铝合金在周浸试验中的腐蚀行为[J]. 中国腐蚀与防护学报, 2009, 29: 215)
[6]	Zhu H B, Huang Y P.The anticorrosion to steel structure in marine atmosphere[J]. Total Corros. Control, 2003, 17(4): 26(朱惠斌, 黄燕萍, 海洋大气环境中钢铁表面的防腐蚀[J]. 全面腐蚀控制, 2003, 17(4): 26)
[7]	Hou J, Zhang P H, Guo W M.Study on corrosion of aluminum alloys for ship applications in marine environment[J]. Equip. Environ. Eng., 2015, 12(2): 59(侯健, 张彭辉, 郭为民. 船用铝合金在海洋环境中的腐蚀研究[J]. 装备环境工程, 2015, 12(2): 59)
[8]	Guillaumin V, Mankowski G.Localized corrosion of 6056 T6 aluminium alloy in chloride media[J]. Corros. Sci., 2000, 42: 105
[9]	Buchheit R C, Moran J P, Stoner G E.Electrochemical behavior of the T1(Al2CuLi) intermetallic compound and its role in localized corrosion of Al-2%Li-3%Cu alloys[J]. Corrosion, 1994, 50: 120
[10]	Buchheit R G, Wall F D, Stoner G E, et al.Anodic dissolution-based mechanism for the rapid cracking, preexposure phenomenon demonstrated by aluminum-lithium-copper alloys[J]. Corrosion, 1995, 51: 417
[11]	Buchheit R G Jr, Moran J P, Stoner G E. Localized corrosion behavior of alloy 2090-the role of microstructural heterogeneity[J]. Corrosion, 1990, 46: 610
[12]	Shaffer I S, Sebastion J C, Rosenfeld M S, et al.Corrosion and fatigue studies of extruded 7075-T6 Spar Caps[J]. J. Mater., 1968, 3(2): 400
[13]	Robinson M J, Jackson N C.Exfoliation corrosion of high strength Al-Cu-Mg alloys: Effect of grain structure[J]. Br. Corros. J., 1999,34: 45
[14]	Kelly D J, Robinson M J.Influence of heat treatment and grain shape on exfoliation corrosion of Al-Li alloy 8090[J]. Corrosion, 1993, 49: 787
[15]	Galvele J R,De Micheli S M.Mechanism of intergranular corrosion of Al-Cu alloys[J]. Corros. Sci., 1970, 10: 795
[16]	Shao M H, Fu Y, Hu R G, et al.A study on pitting corrosion of aluminum alloy 2024-T3 by scanning microreference electrode technique[J]. Mater. Sci. Eng., 2003, A344: 323
[17]	Zhu D Q, Van Ooij W J. Corrosion protection of AA 2024-T3 by bis-[3-(triethoxysilyl)propyl]tetrasulfide in neutral sodium chloride solution. Part 1: corrosion of AA 2024-T3[J]. Corros. Sci., 2003, 45: 2163
[18]	Fan L, Liu L, Cao M, et al.Corrosion behavior of Ti60 alloy under a solid NaCl deposit in wet oxygen flow at 600 ℃[J]. Sci. Rep., 2016, 6: 29019
[19]	Fan L, Liu L, Yu Z F, et al.Corrosion behavior of pure Ti under a solid NaCl deposit in a wet oxygen flow at 600 ℃[J]. Metals, 2016, (6): 72
[20]	Cao M, Liu L, Fan L, et al.Influence of temperature on corrosion behavior of 2A02 Al alloy in marine atmospheric environments[J]. Materials, 2018, 11: 235
[21]	Wang B B, Wang Z Y, Han W, et al.Atmospheric corrosion of aluminium alloy 2024-T3 exposed to salt lake environment in Western China[J]. Corros. Sci., 2012, 59: 63
[22]	Li T, Li X G, Dong C F, et al.Characterization of atmospheric corrosion of 2A12 aluminum alloy in tropical marine environment[J]. J. Mater. Eng. Perform., 2010, 19: 591

[1]	Feng ZHAO, Fayun LU, Nan MU, Fuan GUO, Li ZHANG. Relations between Microstructure and Exfoliation Corrosion Resistance of 7050 Al-alloy[J]. 中国腐蚀与防护学报, 2015, 35(5): 423-428.
[2]	Bo JI,Xinming ZHANG,Zhuofu ZHANG,Lingying YE,Wenjian LI. Influence of Yb Addition on Resistance to Exfoliation Corrosion of Aluminum Alloy 2519A[J]. 中国腐蚀与防护学报, 2015, 35(3): 279-286.
[3]	HUANG Changlong, WAN Xiaopeng, ZHAO Meiying, XU Hairong. EFFECTS OF AXIAL STRESS ON EXFOLIATION CORROSION OF 7150 ALLOY[J]. 中国腐蚀与防护学报, 2011, 31(2): 135-138.
[4]	HUANG Changlong, XU Hairong. EFFECTS OF TEMPER ON EXFOLIATION CORROSION OF 7150 ALLOY[J]. 中国腐蚀与防护学报, 2010, 30(6): 487-490.
[5]	SUN Shuangqing ZHENG Qifei LI Defu CHEN Jie WEN Junguo. LONG-TERM ATMOSPHERIC CORROSION BEHAVIOR OF LY12 ALUMINIUM ALLOY[J]. 中国腐蚀与防护学报, 2009, 29(6): 442-446.
[6]	LIANG Wenjie PAN Qinglin LI Yunchun HE Yunbin LI Wenbin ZHOU Yingchun LU Congge. EXFOLIATION CORROSION BEHAVIORS OF Al-Cu-Li-(Sc+Zr) ALLOY[J]. 中国腐蚀与防护学报, 2009, 29(1): 30-34.
[7]	;. Influence of Marine Atmosphere Humidity On Initial Corrosion of LY12[J]. 中国腐蚀与防护学报, 2007, 27(3): 134-136 .
[8]	Yue Wang; Zhenghong Wang; Zilai Wu; Haifeng Zhang. STRESS CORROSION CRACKING AND EXFOLIATION CORROSION RESISTANCE OF Al-Mg ALLOY WITH ADDITION OF SCANDIUM[J]. 中国腐蚀与防护学报, 2005, 25(4): 218-221 .
[9]	Jinfeng Li; Ziqiao Zheng; Zhao Zhang; Jianqing Zhang. ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OF Al ALLOYS DURING EXFOLIATION CORROSION[J]. 中国腐蚀与防护学报, 2005, 25(1): 48-52 .
[10]	. Intergraular Corrosion and Exfoliation Behaviors of Peak-Aged AA2090 and AA8090 Al-Li Alloys[J]. 中国腐蚀与防护学报, 2004, 24(3): 135-142 .
[11]	Qing Qv; Chuanwei Yan; Wei Bai. ROLE OF NaCl IN THE ATMOSPHERIC CORROSION OF A3 STEEL[J]. 中国腐蚀与防护学报, 2003, 23(3): 160-163 .

No Suggested Reading articles found!

Viewed

Full text

Abstract

Cited

Shared

Discussed