Paramount Metal Finishing offers LARGE PARTS PLATING to ASTM, AMS and MILITARY Specifications for large and heavy components through the use of internal anodes. PMF has the capacity for large components such as rollers, frames, hydraulic manifolds and chambers that require partial or complete plating coverage.

PLATING LARGE PARTS

Electroless Nickel Plating

Zinc Nickel Plating

Zinc Plating w/Internal Anodes

Nitric Passivation

Electroless Nickel Plating

Paramount Metal Finishing applies Sanchem conversion coatings on zinc, magnesium and aluminum. Sanchem is a RoHS compliant chromate-free conversion coating that leaves an electrically conductive clear to gold protective surface treatment. Sanchem is an excellent preparation of aluminum, magnesium or zinc substrates for paint, powder coating and e-coat as well as adhesives. Sanchem can produce far better coating adhesion comparable to hexavalent chromate conversion coatings.

Sanchem is a high-performance conversion coating that offers:

• Clear or gold RoHS compliant coating
• Chromate free
• Excellent corrosion resistance
• Electrically conductive film on wrought aluminum, aluminum castings, magnesium and zinc as well galvanized steel.
• Excellent pretreatment for paint
• High-temperature applications
• Salt Spray 168 hours on aluminum castings
• Cost-effective coating
• Used in sensitive military and medical applications.

Paramount Metal Finishing applies Sanchem conversion coatings to Zinc, Aluminum, and Magnesium cast or wrought substrates. Paramount Metal Finishing can coat Sanchem treated substrates with various paints, powder coatings and dry-film lubricants.

MIL-DTL-16232 TYPE M
Manganese Phosphate Coating
Phosphate Conversion Coatings

Manganese Phosphating Conversion Coatings MIL-DTL-16232 Type M is an excellent coating for wear reduction and corrosion resistance when used with supplementary treatments such as oil, wax, lubricant, painting or powder coating. Manganese phosphate (mphos) MIL-DTL-16232 Type M coatings are typically much heavier than Zinc phosphate MIL-DTL-16232 Type Z coatings. Manganese phosphate coatings normally exhibit a uniform dark grey color that is durable and none light reflective.

MIL-DTL-16232 Type M phosphating is commonly used for the following types of components:

• Pistons and Bearings
• Machined parts
• Firearms and munitions
• Mortar Tubes and Gun Barrels
• Fasteners and Automotive components

Paramount Metal Finishing is the MIL Spec Specialist for both manganese phosphate as well as zinc phosphate coatings. Many of our processes have been directly approved by the US government.

Manganese phosphate and zinc phosphate conversion coatings to the MIL-STD-171 Standard, MIL-DTL-16232 Type M and Type Z Class 1, 2, & 3 as well as light zinc phosphate per TT-C-490 as pretreatment to powder coating and wet spraying.

Barrel and Rack processing on parts up to 9 feet. Abrasive blasting, stress relief and hydrogen embrittlement relief (HER) are available as well as solid film lubrication.

Plating Coverage using Internal Anodes

Electroless Plating Alternative

When electroless plating is not an option and the plating thicknesses of electrolytic coatings are of high importance on the internal surfaces of a part such as cavities/bores, cylinders or the inside of accumulators, the use of an internal anodes is the only alternative to achieve complete and uniform coverage on the interior of components.

Without the use of a supplementary electrically conductive anode you can typically expect a plating thickness ratio of 1:5 from internal to external surfaces on a cavity as small as 70mm in length. This ratio will increase if the cavity is longer, and at worst case could result in no coatings being deposited. Therefore the internal anode will alter the current distribution in electroplating and give a more uniform thickness throughout a cavity or interior surface.

Paramount Metal Finishing has decades of experience in designing the necessary tooling to maximize the properties of using of internal anodes. These fixtures will ensure a smooth, homogenous internal coating, similar in thickness, performance and appearance to that of external plating deposits.

Internal anode plating is a unique way of maximizing corrosion protection on the inside of parts, especially items of intricate designs and configurations such as pipes, tubes, chassis and cup shaped items.

Paramount Metal Finishing can accommodate internal anode plating to a wide range of complex parts with zinc plating for parts up to 11 feet in length; zinc nickel plating, bright tin plating for parts up to 9 feet long.

Smaller size projects for plating of gold, silver and indium plating can be performed as well with internal anode technology. Paramount also offers complete and uniform coverage utilizing electroless nickel plating (ASTM B733 and AMS-C-26074) for parts up to 9 feet in length.

Electrolytic Zinc plating ASTM B633, Zinc Nickel AMS 2417, ASTM B841