Acid Etch Aluminum Anodizing Process Reduces Color Variation, Company Says
ATLANTA, Ga.--An acid etch aluminum anodizing process recently introduced by Southern Aluminum Finishing Co., Inc. (SAF) is more environmentally friendly and yields better color consistency than traditional caustic soda etch while meeting or exceeding all AAMA 611 specifications, the company says. By reducing color variation, acid etched aluminum is expected to better meet the needs of SAF's extrusion, fabrication, and finishing customers in the North American construction industry.
"An acid etch makes for a more uniform appearance and hides metal imperfections better than the caustic etch," said Penn McClatchey, SAF's marketing manager, in a statement. "It requires less etching time, which significantly reduces the amount of metal lost in the anodizing process. This is helpful to our customers who charge by the pound."
The acid etch process is said to be more environmentally friendly, resulting in less waste sludge disposal. It also accommodates the use of a higher percent of recycled content in extrusion billet while still maintaining high uniformity of finish. While SAF (www.saf.com) continues to supply caustic soda etch, the acid etch treatment reportedly offers a superior uniform matte finish and an anodic coating free of streaks or flow lines.
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