The Cleaning of Aluminum Frame Assembly Units

Shen, T H

Lawrence Livermore National Laboratory

关键词: Removal;    Aluminium;    Alloys;    36 Materials Science;    Casting;   

DOI  :  10.2172/15002767
RP-ID  :  UCRL-ID-143931
RP-ID  :  W-7405-ENG-48
RP-ID  :  15002767

美国|英语

来源: UNT Digital Library

【 摘 要 】

The Brulin immersion and the precision cleaning experiments have shown that neither the Brulin solution nor the precision cleaning in AstroPak causes the smut formation on aluminum surfaces. The acid-bath cleaning in GTC is the primary source of the smut formation. The current GTC acid formulation etches the aluminum matrix quite aggressively, but does not appear to appreciably attack the Si particles. Therefore, this acid-bath cleaning will leave the cast-aluminum part surfaces with many protruded Si particles, which could potentially cause smut problems in the cleaning process down-stream. To ensure the removal of all loose Si particles from the cast-aluminum parts, it is necessary to physically hand-wipe and vigorously wash the acid-bath cleaned surfaces. Furthermore, the casting porosity in alloy A356 could be another source in causing high swipe readings in the FAU parts.