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Submitted By:   messydeer@yahoo.com
Email List:   Zenith-List
Name:   

Dan Morehouse

Date:   

Feb 11 2006

Subject:   'water stain' corrosion on sheets
Description:   

I left ~20 sheets of .025 and .032 outside for 8 months. Pics of damage and removal.

 
    Blendex_and_Alumiprep.jpg lower left (below angle grinder): after 1:2 diluted Alumiprep, 6-7' dwell time, moderate hand scrubbing (~50#) with green scotchbrite; lower right: after Blendex (fine grade) mounted on angle grinder, ~20# pressure; upper right: untreated.
    Blendex_only.jpg closeup high contrast of remaining 'shadow' of stain after Blendex; similar to lower right area of other pic; this 'shadow' was completely ablated with ~40-60# pressure on the angle grinder; staying too long in one place is a concern here
    corroded_.025_closeup_1.jpg from ~2' away
    corroded_.025_closeup_2_(before).jpg closeup of boxed area in closeup 1; narrowest area of stain ~3/8"
    corroded_.025_closeup_3_(after).jpg after aggressive hand scrubbing (~75#?) with naphtha and green scotchbrite
    Corroded_.025_full_sheet.jpg 4x12 sheet with 'water stain'4x12 sheet with 'water stain'





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