AN IMPROVED PROCESS FOR THE SEALING OF SUBSTRATES OF ANODISED ALUMINIUM AND ANODISED ALUMINIUM ALLOYS

摘要

An improved process for the sealing of substrates of anodised aluminium and anodised aluminium alloys comprising subjecting the anadised substrates to treatment in an aqueous path consisting of a hydrolysable salt of an alkali or alkaline earth metal hypophosphite admixed with an hydroxy carboxylic acid such as herein described or a water soluble sodium or potassium salt of said hydroxy carboxylic acid or sodium or potassium salt of acetic acid a temperature of 30 Degree to 50 Degree Celsius for 10 to 20 mixture at a pH between 5 and 7.