South Coventry, CT, United States
South Coventry, CT, United States

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Rudy S.F.,Hubbard Hall Inc.
Plating and Surface Finishing | Year: 2010

The introduction of surfactant technology provides a variety of effective detergents and wetting agents that blend with selected alkaline materials to provide the emulsification or displacement action. Certain surfactants directly split the oils while unique surfactant combination can readily remove many different types of process oils, such as chlorinated, mineral, paraffins, hydrocarbon rustproofs, sulfurized and synthetics. The agents also prevent oils from adhering to polypropylene barrels exiting the cleaner bath. The specialized surfactant blends soften and lift buffing and polishing compounds. Oil displacement has become a more popular method of alkaline cleaning that leads to the increased useful application of mechanical filtering devices. Several oils can be recycled by certified firms used as an additive with fuel oil in plant boilers. Liquid cleaners offer several benefits such as it is safer, easier to handle and can be pumped through pipes to the process tank from another plant location.


Rudy S.F.,Hubbard Hall Inc.
Plating and Surface Finishing | Year: 2010

Some of the problems related to the deposition in electroless nickel (EN) and the corrective actions in this direction are presented. Use of RoHS compliant EN is preferred to avoid the detrimental stabilizing effects of cadmium and lead. Fine deposit pitting is a problem associated with incomplete surface preparation. The problem of nitrates that significantly affect the EN deposit can be reduced by replacing the EN bath or improving rinsing between acid desmut and the EN bath. Low deposition rates can be the result of low nickel, hypophosphite, pH and/or bath temperature, while other operating factors include a bath that is over-stabilized, low bath loading and excessive solution agitation. It is recommended to not use rolled depolarized anodes, or any insoluble anodes, and ignore the stress, particularly if internal anodes are required.


Rudy S.F.,Hubbard Hall Inc.
Plating and Surface Finishing | Year: 2010

Mechanical plating is essentially a tumbling process, by which metallic dusts are deposited on to a metal substrate. Deposited metals may include zinc, copper, tin, precious metals, aluminum and cadmium. Mechanical washer or solvent cleaning are employed in parts cleaning as to effectiveness, availability, economic feasibility, and many more. Surface conditioning step utilizes the action of a special chemical additive and media. The chemical additive consists of surfactants, inhibitors and inorganic acids. Promoter or accelerator solution consists of a proprietary additive, which standardizes conditions for deposition of the metal of choice. Flash coat is the first addition of metal powder to be deposited. Sufficient additions of metal powder are added based on the thickness requirement. The advantages of mechanical plating include elimination of hydrogen embrittlement, post plate baking, consistent uniformity of deposit, and excellent deposit adhesion.

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