C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/23
C23C 22/56 (2006.01) C23C 22/66 (2006.01)
Patent
CA 1326989
ABSTRACT OF THE DISCLOSURE An aluminum conversion coating composition for aluminum or an aluminum alloy. The composition has as essential ingredients alkali metal permanganate, and at least one compound selected from alkali metal chloride, alkali metal tetraborate, alkali metal metaborate, benzoic acid, alkali metal benzoate, alkali metal carbonate and a mixture of the alkali metal tetra-and metaborates and if desired, an alkali metal phosphate, alkali metal silicate, alkali metal nitrate. The non- silicate composition has a pH of 7 to less than 12.5. The alkali metal silicate composition has a pH as high as 14. My compositions are effective for protecting the aluminum and aluminum alloys for sufficient hours in salt fog at 95°F according to standard ASTM method B- 117. I also provide a process of coating the aluminum or aluminum alloy. 47
545159
Bereskin & Parr
Sanchem Inc.
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