Zinc Plating of Steel Fittings for a Hydraulic Hose Application

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All-Metal Fittings

A customer from the automotive/agriculture industry approached Elm Plating Company to apply a protective corrosion-resistant coating to steel fittings that are used within hydraulic hoses in a variety of applications. The high-volume applications required a 0.07-0.19 coefficient-of-friction and had to also assure the ability of the component parts to achieve corrosion performance after crimping the parts onto the hose. The solution we derived from several DOE trials was to apply a 0.0002”-0.0004” zinc trivalent clear chromate with an integrated lubricant in an improved barrel rotation cycle. The process proved capable and repeatable in regards to the COF, corrosion resistance and plating thickness requirements of our customer’s supplied specifications and testing standards. After proving the process out on several different families of fittings, our customer approved us as their primary plating source for all of their applications.

For more information on this project or other examples of our high quality workmanship, please contact Elm Plating.

Zinc Plating Project Highlights

Project Name

Steel Fittings

Product Description

These zinc plated fittings are used within hydraulic hose applications.

Capabilities Applied/Processes

Zinc Plating

Zinc Tri Clear Seal

Packaging

Equipment Used to Plate Part

Automated Barrel Zinc Electrodeposit Line

Overall Part Dimensions

Coating Thickness: .0002"-.0004" mils
Length: .795"
Hex Width: .688"

Tightest Tolerances

COF 0.07-0.19

Material Used

Steel

Material Finish

Trivalent Clear Chromate + Integrated Lubricant Seal

Resistances

Corrosion

In process testing performed

Salt-Spray Testing

Tested for 96 hours to white corrosion
Tested for 360 hours to red rust

Industry for Use

Automotive/Agriculture

Volume

High Volume, Multi-Part

Standards Met

Customer supplied specifications
ASTM B117-09-Salt Spray Testing

Delivery Location

Ohio