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1、930747SAE TECHNICAL PAPER SERIESDevelopment of a One-Coat Organic as a Replacement for Conventional Two-Coat Composite Systems on Zinc NickelCynthia A. GosselinArmco, Inc.Karl AndersonMorton International- OSU Research Complex. gKt The Engineering SocietyFor Advancing Mobility Land Sea Air and Space
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7、e publisher.ISSN 0148-7191Copyright 1993 Society of Automotive Engineers, Inc.Positions and opinions advanced in this paper are those of the author(s) and nol necessarily those of SAE. The author is solely responsible for the content of the paper. A process is available by which discussions will be
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9、f a proposec manuscript to: Secretary, Engineering Activity Board, SAE.Printed in USA930747Development of a One-Coat Organic as a Replacement for Conventional Two-Coat Composite Systems on Zinc NickelCynthia A. Gosselin Armco, Inc.Karl AndersonMorton International- OSU Research ComplexABSTRACTConven
10、tional prepainted organic coatings on zinc nickel substrates consist of a dried-in-place chrome bearing pretreatment layer followed by a thin film solvent-based organic topcoat. This system is generally applied in order to provide additional corrosion protection to the brittle zinc nickel layer subs
11、equent to forming. An improved version of this organic/metallic coating system has been developed which consists of applying a one- coat water-based chrome bearing epoxy to zinc nickel material. In addition to the production efficiencies gained by applying a one-coat prepainted system, enhancements
12、are also realized with regard to corrosion resistance and formability characteristics. It has also been found that a novel curing technique can be utilized in order to allow for higher temperature curing of prepainted materials on bake hardenable substrates without adversely affecting mechanical pro
13、perties.One of the first uses of prepainted steel within the automotive industry was ZINCROMETAL： that is, a chrome primer coated with a zinc-rich epoxy topcoat on the unexposed side of Cold Rolled Steel sheet. During the 1980s, a new product evolved in which an electroplated zinc nickel substrate w
14、as coated on one side with a thin film (1pm) two-coat organic system. Initially it was thought that zinc nickel would inherently provide both excellent chloride corrosion resistance, coupled with good welding and formability characteristics. However, zinc nickel itself proved to be less corrosion re
15、sistant in field service that was indicated by accelerated laboratory testing. In order to inhibit these corrosion problems, two-coat composite organic systems were developed for the unexposed side of the strip. Until now, these two-coat thin film systems have consisted of a dried-in-place chrome-be
16、aring primer and a solvent-based epoxy topcoat. The organic coating acts as a barrier film, inhibiting catastrophic corrosion from initiating during field service. Without this barrier film, it would be necessary to increase the coating weight of the zinc nickel layer to a level which could adversely affect welding and formability in order to enhance corrosion resistance.Recently, a significant advance in pain
