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Ted Mooney, P.E. RET
Pine Beach, NJ

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13.5 pH requirement for Seal on Anodizing

Q. We are hearing a lot requests for bumping the seal requirement on Aluminum Anodizing up to 13.5 pH. I have heard that someone in Germany/Europe is meeting this requirement but I have not found anyone in the states who can supply a seal additive to meet this requirement. Does anyone know if someone is producing a seal that will meet this in the US?

Bryant Tokarz
- Murfreesboro, Tennessee, USA
April 3, 2012

A. I would consider sealing systems which use nickel fluoride impregnation sealing rather than hydrothermal (boiling water or steam) sealing. These processes are often called "cold sealing". One of the problems that arise from using them is the great difficulty in stripping defective coatings in the normal stripper, sodium hydroxide - a property you are seeking.

Harry Parkes
- Birmingham, UK
April 11, 2012

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