Chrome Plating

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Chromium plating

Process


Okuno-Auromex offers hexavalent chrome plating and environmental friendly trivalent chrome plating for bright and black chrome applications


Chrome Plating

Decorative chrome is typically the last layer in a Cu/Ni/Cr multi-layer stack utilized to impart decorative and functional properties to the item being plated. The Cu/Ni/Cr metal layer stack can be applied to metallic substrates like zinc die cast or metalized non-conductive parts such as plastics or resins which have been metallized and rendered conductive. The chrome layer provides color and hue, and corrosion and abrasion resistance.

Okuno-Auromex offers hexavalent chrome plating and environmental friendly trivalent chrome plating for bright and black chrome applications.



Bright Chrome Process


Bright chrome process provides uniform bright, white layer of approximately 0.05 – 0.3 um thickness. The bright chrome also improves abrasion and wear resistance, corrosion resistance, tarnish resistance and weather resistance. This process is widely applied on engine system, automotive trims, hardware and appliances.


Black Chrome Process


Fashion finishes have become increasingly popular for decorative applications and black chromium has been one of the desired colors especially for automotive applications. Other applications include solar panel where it provides high solar absorbance and low thermal emittance.


The table below provides additional product information on nickel plating processes.

Hexavalent Chromium Processes

Process

Product

Feature

Bright Chromium Plating

Saphir 14

Self-regulating solution without solid catalyst. Provide excellent throwing power and wide bright plating range.

Black Chromium Plating

Saphir TS

Self-regulating solution without solid catalyst. Provide uniform deep black film in a wide range of current density. Can be applied
onferrous and non-ferrous materials.

Trivalent Chromium Processes

Process

Product

Feature

Bright Chromium Plating

Saphir 2000

Low trivalent chromium content that reduces drag-out rate and save operating cost. Provide bright color tone same as hexavalent chromium
plating.

TOP Fine Chrome

Brightener for standard process. Provide bright color tone same as hexavalent chromium plating.

TOP Fine Chrome BR

Brightener for barrel plating. Improve the covering power remarkably.

TOP Fine Chrome WR

Brightener for anti-salt damage. Has a superior calcium chloride resistance.

Black Chromium Plating

TOP Farbe COB

Provide a deep and rich black color appearance that are available for decorative purposes.

TOP Farbe BLB

Provide bluish black color appearance and has excellent corrosion resistance that are available for automotive parts.

TOP Fine Chrome FMB

Provide attractive smoke color appearance and has excellent covering power and throwing power.

Additives for Chromium Plating – Mist Suppression


The chromium plating process generates significant amounts of hydrogen at the cathode, and oxygen at the anode in the form of tiny bubbles which are released to the surrounding environment as they escape the confines of the plating solution. Upon their release from solution, the bubbles can burst and eject a mist of chromium acid solution droplets into the air. This mist is extremely hazardous and must be eliminated to provide a safe working environment. The electroplating industry employs mist suppressants to inhibit and control the release of toxic chrome in the air.

Okuno-Auromex provides both an efficient PFOS-based mist suppressant and environmental friendly PFOS-free mist suppressant that can reduce the surface tension of the plating solution, reducing the size of individual gas bubbles and the energy released by bursting bubbles.

Process

Product

Feature

PFOS-Type Agent

Chrome Mist RF

Form a thin layer on the surface to prevent the fume entering into the air and polluting to the surroundings. Can be stably stayed in the
chromic acid.

PFOS-Free Agent

Proquel OF

Remarkably reduce the surface tension of all kind of chromium electrolytes and simplify ventilation to prevent foam generation.


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