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EFFECTS OF CAUSTIC BLEACH ON ANODIZED SURFACE

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WHAT ARE THE EFFECTS OF A CAUSTIC BLEACH ON AN ANODIZED ALUMINUM SURFACE. THE PART WILL NOT BE SUBMERGED INTO THE SOLUTION BUT WASHED OFTEN TO KEEP THIS COMPONENT CLEAN AS IT IS USED WITH MEDICAL INSTRUMENTS.

Betsy Renae
- Roanoke, Virginia


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Caustic soda and Caustic Potash DISSOLVES BARE ALUMINUM AND ALSO DISSOLVES Aluminum Oxide. IN a "bleach" strength the dissolution will be slow, but noticeable.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

Editor's note: Mr. Probert is the author of Aluminum How-To / Aluminio El Como



First of two simultaneous responses -- +++

Your inquiry is similar to a letter sometimes ago that asking why anodic coating on aluminum plates did not last with dishwasher use. The alkaline water dissolves the anodic coat. In your case, it will be more severe as your oxidizing solution is highly alkaline.

Dado Macapagal
- Toronto, Ont


Second of two simultaneous responses -- +++

I have just tested a sample which had its anodized coating completely removed due to exposure to chloride and or caustic environments. I might expect the same result depending on your coating thickness, conditions of use.

Jeffrey Urbanski
- Buffalo, New York

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