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Ask the Expert Question-and-Answer Archive by Ron Joseph October, 2009 Surface Preparation for 6061-T6 Aluminum Q. Could you recommend a surface preparation process for 6061-T6 aluminum? Component will be painted and used in a scientific ccd camera application requiring vacuum levels of 0.1 - 5 T. A. The best pretreatment is a chromate conversion coating complying with MIL-C-5541 Class 1 A. However, I cannot tell you anything about potential out gassing under vacuum and for that information I suggest you call or write to Henkel Surface Technologies or Chemetall, since they are probably the largest suppliers of this pretreatment system. Ron Joseph |