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Surface Treatment

On automotive parts, usually rust preventive surface treatment is applied. Zinc based plating or nickel based plating is often used since they have very reliable performance among various treatment methods. Inside and/or outside surface(s) of USUI made tubes are treated, according to the applications, by proprietary zinc based or nickel based plating.

Standard tube outside surface treatment
(Hexavalent chromate free)

Zn+Trivalent Chromate

Applications

General purpose

Zn/Ni+Trivalent Chromate

Features

Heat resistant & corrosion resistant

Applications

For Tubing in engine room

HI-TIN-Z

Features

Heat resistant & high corrosion resistant
(Salt damage countermeasure)

Applications

For Tubing in engine room
For Power steering tubing

ZINIC

Features

Heat resistant & high corrosion resistant
(Salt damage countermeasure)

Applications

For Tubing in engine room
For Power steering tubing

NEW SUPER COAT

Features

High corrosion resistant

Applications

For Brake tubing
For Fuel tubing
For Tubes both ends press forming required

PC TUBE

Features

High corrosion resistant & anti-chipping resistant

Applications

For Brake tubing
For Fuel tubing
For Tubes both ends press forming required

ULLT

Features

High corrosion resistant & anti-chipping resistant

Applications

For Brake tubing
For Fuel tubing
For Tubes both ends press forming required

Tube inside surface treatment

Only for Single Walled Steel Tubing(Hycolin)

Nickel Plating

Features

Prevention of copper elution. To be used with Ethanol blended gasoline and sour gasoline

Applications

For Fuel tubing

HINIC (Double Layer Nickel)

Features

Improved corrosion resistant. To be used with Ethanol blended gasoline and sour gasoline

Applications

For Fuel, air, and water tubing