Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 36
PLATING AND ANODIZING: PRETREATMENT
Plating Line Setup
Spray Washer
when parts are smaller with complex geometries where spray
cannot clean all areas equally and it generally has greater
heat, concentration, and contact time than a spray cleaning
process.
The second step is usually an electrocleaner.
Electrocleaning is used to remove soils that could not be
removed in the alkaline cleaning step. These are often
inorganic in nature and may include metallic fines, polishing
compound abrasives, carbon and other alloying elements.
Even when the electrocleaner doesn't completely remove
the remaining soils, it conditions them for easier removal in
the subsequent step. This cleaning process uses an electrical
current and specially formulated cleaners. The parts are
electrically connected and either oxygen or hydrogen is
generated at the part depending on whether the part is
connected to positive or negative current. This gas generation
provides a scrubbing effect to supplement the heat and
chemical cleaning action.
Electrocleaning is followed by an acid pickling step. The
acid is used to remove scale and oxides and neutralize alkaline
residues to result in a clean, active plateable surface. A variety
of acids can be used ranging from strong mineral acids to
mild mineral acids, organic acids or acid salts. Acid choice
depends on the substrate as well as the severity of the soil.
For steel substrates, hydrochloric acid is commonly used.
Additives and proprietary acid blends are available offering
acid inhibitors, fluoride activators, and/or surfactants for
improved rinsing and providing mist suppression.
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Canadian Finishing & Coatings Manufacturing - Sept/Oct '23
Table of Contents for the Digital Edition of Canadian Finishing & Coatings Manufacturing - Sept/Oct '23
Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 1
Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 2
Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 3
Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 4
Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 5
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Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 15
Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 16
Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 17
Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 18
Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 19
Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 20
Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 21
Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 22
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Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 24
Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 25
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https://www.nxtbook.com/kerrwil/CFCM/canadian-finishing-coatings-manufacturing-sept-oct-23
https://www.nxtbook.com/kerrwil/CFCM/canadian-finishing-coatings-manufacturing-magazine-march-april-2022
https://www.nxtbook.com/kerrwil/CFCM/September-October2021
https://www.nxtbook.com/kerrwil/CFCM/CFCMBuyersGuide2021
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