Effect of Fe-Zn upper coating on stone chipping resistance of zinc alloy coated steel sheets

Hiroaki Nakano, Masaaki Urai, Masatoshi Iwai

Research output: Contribution to journalArticle

Abstract

The effect of Fe-15%Zn upper coating on stone chipping resistance of galvannealed steel sheet and Zn-Ni electroplated steel sheet was investigated by using gravelometer under the temperature of -20 °C after three-coat painting (phosphate, electropaint, primer surfacer and top coat) for automobile outer panel. (1) The plating/base-steel interface damage diameter by the stone chipping decreases largely by plating Fe-Zn upper coating on zinc alloy coated steel sheets. On the other hand, the electropaint/phosphate interface damage diameter increases by Fe-Zn upper coating. (2) P-ratio [Phosphophyllite/(Phosphophyllite+Hopeite)] of phosphate film of zinc alloy plated steel sheets increases by Fe-Zn upper coating. The peeling resistance between electropaint and phosphate film against impact becomes low when P-ratio is high. From these results, the reason why the peeling at plating/steel interface decreases when Fe-Zn upper coating is applied seems as follows: Under the condition where Fe-Zn upper coating is applied to zinc alloy plated steel sheets, the peeling resistance at electropaint/phosphate interface is weaker than that at plating/steel interface, then the peeling occurred at interface between electropaint and phosphate, which consumes the kinetic energy of gravel, so peeling at plating/steel interface becomes small.

Original languageEnglish
Pages (from-to)39-44
Number of pages6
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume85
Issue number1
DOIs
Publication statusPublished - Jan 1 1999
Externally publishedYes

Fingerprint

chipping
zinc alloys
Zinc alloys
Steel sheet
Peeling
Plating
Phosphates
Steel
steels
rocks
peeling
coatings
Coatings
plating
phosphates
Painting
Gravel
Kinetic energy
Automobiles
damage

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

Cite this

Effect of Fe-Zn upper coating on stone chipping resistance of zinc alloy coated steel sheets. / Nakano, Hiroaki; Urai, Masaaki; Iwai, Masatoshi.

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 85, No. 1, 01.01.1999, p. 39-44.

Research output: Contribution to journalArticle

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