1988-09-01

Application of Organic-Composite-Coated, Zn-Ni-Plated-Steel Sheets (Durasteel) to Automobile Body Panels 885043

A variety of techniques are employed by automobile manufactures in an effort to assure the anti-corrosion performance of thin product. One of the most effective techniques is to use surface-treated steel sheets for making vehicle body panels.
Durasteel features a double layer construction, in which a thin organic film is applied over a zinc-nickel alloy layer which provides good protection against base metal corrosion.
Durasteel sheets possessing a bake hardening property have started to be applied to outer body panels in recent years. Until recently, it was impossible give paint-coated steel sheets the bake hardening property of Durasteel.
In this investigation, a new resin coating has been developed which can be baked at low temperature without sacrificing its corrosion resistance. The key technological issues encountered in the development work were to select the right resin material and to find the best method for applying chromate treatment to the alloy surface.
Steel panels treated with this resin coating show an excellent balance of corrosion resistance, workability and mechanical properties in automobile applications.

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