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公开(公告)号：US3567533A
公开(公告)日：1971-03-02
申请号：US3567533D
申请日：1969-02-20
Applicant: FMC CORP
Inventor： CHIANG JOHN S C , MCMANAMON JOSEPH T
CPC classification number: C23F1/02 , H05K3/062 , H05K3/067 , H05K2201/0175 , H05K2201/0305
Abstract: A METHOD OF ETCHING A METAL WORKPIECE IS DESCRIBED, WHICH CARRIES A TIN RESIST (OR A TIN-COATED SOLDER RESIST), A CHROMATE COATING IS PROVIDED OVER THE RESIST, AND THE METAL WORKPIECE IS ETCHED WITH AN AQUEOUS ETCHANT SUCH AS A PEROXYSULFATE CONTAINING PHOSPHORIC ACID OR A SODIUM CHLORITE-AMMONIUM HYDROXIDE SOLUTION OR A CHROMIC-SULFURIC ACID BATH TO DISSOLVE THE METAL FREE OF RESIST, THUS PRODUCING BRIGHT, SMOOTH AND ELECTRICALLY CLEAN RELIEFS HAVING SHARP PATTERN DEFINITION ON THE METAL WORKPIECE.
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