Metal Finishing Guide Book

2012-2013

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322 Anode polarization Low current Poor distribution Pitting Rough deposit Loss of brightness (in bright formulations) Problem High current density burning High sulfuric acid Low copper sulfate Organic contamination Current density too low High temperature Tin, gold contamination Low temperature Improper anodes High chloride Cause Low copper, high acid Low temperature Insufficient agitation Organic contamination Low chloride (bright baths) Low additive Organic contamination Low chloride High temperature Low copper Particles in solution Torn anode bags Improper anodes Low chloride Organic contamination Anode slough Low chloride Low or nonuniform agitation Excessive anode area Improper anode film Current supply AC ripple Organic contamination Organic contamination Low sulfuric acid Low additive High chloride Table X. Troubleshooting Guide for Acid Copper Sulfate Plating Corrective Action Analyze and adjust Heat bath Lower current, unless agitation can be improved Carbon treat Analyze and adjust Determine addition by Hull cell Carbon treat Analyze and adjust Cool the bath Analyze and adjust Filter bath Replace torn bag Use phosphorized copper anodes Analyze and adjust Carbon treat Bag anodes Analyze and adjust Improve and adjust Adjust Dummy Adjust to below 10% Carbon treat Carbon treat Analyze and adjust Determine addition by Hull cell 1. Wash off anode film and dummy to reform film 2. Precipitate with silver sulfate or nitrate and carbon filter 3. Dilute Increase current Cool bath Dummy with a copper foil (no current) Heat bath Bright baths require phosphorized anodes 1. Wash off anode film and dummy to reform film 2. Precipitate with silver sulfate or nitrate and carbon filter 3. Dilute Analyze and dilute bath Analyze and adjust Carbon treat

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