The Cleaning of OAB Universal Covers - An Origin of Smut in Aluminum Alloys

Shen, T

Lawrence Livermore National Laboratory

关键词: Aluminium;    Alloys;    Electrostatics;    Origin;    Etching;   

DOI  :  10.2172/15002160
RP-ID  :  UCRL-ID-148327
RP-ID  :  W-7405-ENG-48
RP-ID  :  15002160

美国|英语

来源: UNT Digital Library

【 摘 要 】

The smut that appeared on the universal covers after the OAB cleaning process consists of sub-micron size aluminum particles originating from the machining of these parts prior to cleaning. The rigorous gross and precision cleanings with Brulin in the OAB cleaning process could not completely wash these fine particles away from the surfaces. However, applying a phosphoric acid etch before the cleaning helped to remove these fine aluminum particles. Experimental results again showed that an acid etching before cleaning is essential in preventing the occurrence of smut in aluminum alloy after gross/precision cleaning. A mechanism, based on the electrostatic {zeta}-potential, is proposed to explain the occurrence of smut that is often encountered during the cleaning of aluminum alloys.