Processes and compositions for abrasive blast cleaning
AssigneePyrene Chemical Services Limited
InventorGeorge L. Higgins
Life of this patent
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Abstract
An aqueous wet blasting composition and process for cleaning a ferrous surface which reduces the rusting of the surface due to aqueous contact by incorporating phosphate ions and an imine compound in the composition.
Claims11
In a process for cleaning a ferrous surface by wet blasting using a stream of air, water and abrasive particles, the improvement comprising reducing the rusting of the cleaned surface by contacting the surface during blasting with an aqueous solution containing phosphate ions and, an imine compound.
An aqueous solution comprising 0.2 to 4.5 g/l guanidine (measured as guanidine carbonate) and phosphate ions present in a ratio of phosphate ions (measured as 100% phosphoric acid) to guanidine (measured as guanidine carbonate) of 0.3 to 3:1.
Dependencies are inferred from the claim text.