Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 22    No. 7    July 2012

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Effects of boric acid on microstructure and corrosion resistance of boric/sulfuric acid anodic film on 7050 aluminum alloy
DU Nan, WANG Shuai-xing, ZHAO Qing, SHAO Zhi-song

National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology,
Nanchang Hangkong University, Nanchang 330063, China

Abstract:The microstructure and corrosion resistance of different boric/sulfuric acid anodic (BSAA) films on 7050 aluminum alloy were studied by atomic force microscopy (AFM), electrochemical impedance spectroscopy (EIS) and scanning Kelvin probe (SKP). The results show that boric acid does not change the structure of barrier layer of anodic film, but will significantly affect the structure of porous layer, consequently affect the corrosion resistance of anodic film. As the content of boric acid in electrolyte increases from 0 to 8 g/L, the resistance of porous layer (Rp) of BSAA film increases, the capacitance of porous layer (CPEp) decreases, the surface potential moves positively, the pore size lessens, and the corrosion resistance improves. However, the Rp, CPEp and surface potential will change towards opposite direction when the content of boric acid is over 8 g/L.

 

Key words: aluminum alloy; anodic film; corrosion resistance; boric acid

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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