EFFECT OF BORATES AND SILICATES ON WEARING PROPERTIES OF MAO COATINGS

Yu Zhang, Yan-Wei Zhao, Nan Xiang and Ren-Guo Song
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Yu Zhang: Key Laboratory of E&M, Ministry of Education and Zhejiang Province, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, P. R. China†School of Mechanical Engineering, Zhejiang Industry Polytechnic College, Shaoxing, Zhejiang 312000, P. R. China
Yan-Wei Zhao: Key Laboratory of E&M, Ministry of Education and Zhejiang Province, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, P. R. China
Nan Xiang: #x2021;School of Materials Science and Engineering, Changzhou University, Changzhou, Jiangsu 213164, P. R. China
Ren-Guo Song: #x2021;School of Materials Science and Engineering, Changzhou University, Changzhou, Jiangsu 213164, P. R. China

Surface Review and Letters (SRL), 2017, vol. 24, issue 05, 1-10

Abstract: In the present study, microarc oxidation (MAO) coatings were formed on ZL101A aluminum alloy in an electrolytic bath containing 3g/L KOH + 2g/L Na2WO4+ 4g/L KF. The morphology and wearing behavior were investigated. In both electrolytes, the additives were borates (Na2B4O718g/L) and silicates (Na2SiO3 18g/L), respectively. It was found that the coating formed in borates-containing electrolyte was of compact and smooth structure than that of the one formed in silicates-containing electrolyte at the optimum treatment time. It was found that all the coatings were composed of á-Al2O3 and ã-Al2O3. The microhardness and wear tests proved that the coating formed in borates-containing electrolyte was having better mechanical properties than those of the coating formed in silicates-containing electrolyte.

Keywords: Microarc oxidation; ZL101A aluminum alloy; electrolytes; wear test; microstructure (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500615

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