Patent Issued for Aluminum Etching Technology
Houghton International Inc. and Houghton Technical Corp. announced that the United States Patent Office issued U.S. Patent No. 9,732,428, “Methods and Compositions for Acid Treatment of a Metal Surface.” This patent protects Houghton’s technology for aluminum acid etching, which improves upon conventional caustic etching and is formulated to provide a premium matte finish at low gloss values with minimum aluminum dissolution.
Compared to conventional caustic etching, Houghton’s acid etch technology significantly reduces etch time, reduces waste sludge by over 50% and is performed at lower temperatures. For aluminum extrusion customers, the technology is effective in hiding extrusion lines and is not sensitive to zinc contamination.