Method of inhibiting darkening, blackening or tarnishing of aluminium and aluminium alloys and compositions therefore

摘要

There is disclosed a method of inhibiting darkening, blackening or tarnishing of aluminium and aluminium alloys comprising contacting an aluminium alloy with a fluid composition containing a composition in an amount effective to inhibit darkening, blackening or tarnishing of the surface of the aluminium or aluminium alloy at an effective pH, and compositions therefore. Also disclosed are aqueous metal working fluid compositions containing the compositions of the invention.