Metal Finishing Guide Book

2012-2013

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Problem Possible Cause How to Correct Cloudy deposit MCD or HCD 1. Low brightener 2. Low pH 3. Organic contamination 4. Metallic contamination 1. Increase concentration of brightener 2. Adjust pH 3. Carbon treatment 4. High pH + carbon treatment Dull deposit LCD area 1. High brightener 2. Metallic contamination 3. Low carrier 4. High agitation 1. "Dummy" solution at 4���5 ASF 2. "Dummy" solution at 4���5 ASF 3. Add carrier 4. Reduce agitation rate Cloudy deposit LCD area 1. Low brightener 2. Low pH 3. Low index 1. Adjust brightener concentration 2. Adjust pH 3. Add index Poor leveling 1. Low brightener 2. Low carrier 1. Add brightener 2. Add carrier Poor ductility 1. High brightener 2. Low carrier 3. High pH 4. Metallic contamination 5. Organic contamination 1. "Dummy" solution at 4���5 ASF 2. Add carrier 3. Adjust pH 4. "Dummy" solution at 4���5 ASF 5. Carbon treatment Burning 1. Low nickel salts/boric acid 2. High CD 3. Low temperature 4. Low agitation 5. Chromate contamination 6. Metallic contamination 1. Add nickel salts/boric acid 2. Reduce CD 3. Adjust temperature 4. Increase agitation rate 5. High CD "dummy" + high pH treatment 6. High pH + carbon treatment Skip plating 1. High brightener 2. Metallic contamination (e.g., Zn, Cd, Pb) 3. Chromate contamination 1. "Dummy" solution at 4���5 ASF 2. "Dummy" solution at 4���5 ASF 3. High CD "dummy" + high pH treatment Bright Nickel: Panels are usually plated at 2 amps for 5 minutes on steel panels. 529

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