Electrolytically deposited hard chronium coatings

Details Electrolytically deposited hard chronium coatings Electrolytically deposited hard chronium coatings

1988-01-22

1989-07-11

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

C25D 1500

Patent

active

048469408

ABSTRACT:
Solid particles of primarily hard substances, solid lubricants, ductile metals or their alloys and/or molten polymers are embedded in a network of cracks of hard chromium coatings to attain improved physical characteristics, primarily to increase wear resistance, sliding behavior, ductility and corrosion resistance.
The chrome plating process takes place in a microcrack-forming chrome-plating electrolyte with solid particles dispersed therein and with one-time or repeated current reversal so that, if the workpiece is connected to the anode, the network of microcracks in the chromium coating is widened and solid particles are embedded within the cracks. Preferred uses are as coatings on the bearing surfaces of piston rings or cylinder bearing sleeves for internal-combustion engines.

REFERENCES:
patent: 3356467 (1967-12-01), Brown et al.
patent: 3844910 (1974-10-01), Lipp et al.

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