Both paint appearance and corrosion performance of automobiles depend on the application of a surface conversion coating. The impact of the choice of metals for automobile body construction on these end use properties has driven developments in surface treatment technology. The performance of steel as an exterior automotive surface was maximized by conversion coatings with a high iron content. When the predominant use of CRS was replaced by the introduction of electrogalvanized and other coated products, changes in cleaners and further changes in phosphate bath and coating composition improved the peformance of the new surfaces. The tri-cation (Zn, Ni, Mn) phosphating systems were the culmination of these changes. In recent years changes in materials of construction have slowed because corrosion goals have been met and, as a consequence, industry needs have shifted. Operational and environmental considerations now play a larger role among the current driving forces in the devlopment of new conversion coating products. This presentation will trace the sequence of improvements which have been introduced in metal preparation and discuss the challenges that are being addressed.
Improvements in the surface preparation of metals for the automobile industry
Verbesserungen bei der Oberflächenvorbereitung von Metallen für die Automobilindustrie
1992
6 Seiten, 2 Bilder, 22 Quellen
Aufsatz (Konferenz)
Englisch
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