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1. (WO2018218435) BRIGHTENING AGENT, ALUMINUM ALLOY WORKPIECE, AND SURFACE ASH AND STAIN REMOVAL METHOD THEREFOR

Pub. No.:    WO/2018/218435    International Application No.:    PCT/CN2017/086359
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Sun May 28 01:59:59 CEST 2017
IPC: C23F 3/03
C23G 1/12
Applicants: SHENZHEN HENGZHAOZHI TECHNOLOGY CO., LTD.
深圳市恒兆智科技有限公司
Inventors: WANG, Raoling
王饶玲
Title: BRIGHTENING AGENT, ALUMINUM ALLOY WORKPIECE, AND SURFACE ASH AND STAIN REMOVAL METHOD THEREFOR
Abstract:
A brightening agent, an ash and stain removal method for an aluminum alloy workpiece, and the aluminum alloy workpiece. The brightening agent comprises the following components in mass contents: 50 g/L to 500 g/L of nitric acid, 1 g/L to 200 g/L of phosphoric acid, 1 g/L to 50 g/L of potassium permanganate, 1 g/L to 200 g/L of sulfuric acid, 1 g/L to 10 g/L of nonylphenol polyoxyethylene ether, and 200 g/L to 500 g/L of water. The brightening agent can effectively remove stains, mold release agents and black rusts on the surface of the aluminum alloy workpiece, and can effectively remove black ash generated after acid corrosion and alkali corrosion are performed, so as to form a clean and bright surface, and the brightening agent provides excellent binding force for subsequent passivation, spray coating or electroplating, and is applicable to a variety of aluminum alloy workpieces (except an aluminum cast die), such as aluminum alloy 6061 and aluminum alloy 7072.