Accession Number:

ADA255590

Title:

Corrosion Protection of Steel and Bond Durability at Polyphenylene Sulfide-to-Anhydrous Zinc Phosphate Interfaces

Descriptive Note:

Journal article

Corporate Author:

BROOKHAVEN NATIONAL LAB UPTON NY DEPT OF APPLIED SCIENCE

Personal Author(s):

Report Date:

1992-01-01

Pagination or Media Count:

12.0

Abstract:

To enhance the performance of high-temperature polyphenylene sulfide PPS coating in protecting steels from corrosion, the cold-rolled steel surfaces were prepared with anhydrous zinc phosphate Zn . Ph conversion coatings containing poly acid anhydride as an interfacial tailoring material. The factors contributing to the formation of a good bond at the PPSZn . Ph joints were as follows 1 the chemical reaction of PPS with Fe203 in the Zn . Ph layers, 2 PPS-to-poly acid anhydride interaction, and 3 the mechanical interlocking between PPS and the rough Zn . Ph crystal surfaces. Although such interfacial bond structures provide a superior durability of PPSZn . Ph joints against a hot H2SO4 solution, the cathodic reaction, H2O 12 O2 2e - 2OH-, occurring at any defect in the PPSZn . Ph joint system when NaCl is present will lead to the delamination of the PPS film from the phosphated steel. This cathodic delamination was due mainly to alkali-induced dissolution of Zn . Ph layers. However, the rate of delamination for the PPSZn . Ph systems was considerably lower compared with that for the PPSsteel system in the absence of Zn . Ph.

Subject Categories:

  • Polymer Chemistry
  • Coatings, Colorants and Finishes
  • Fabrication Metallurgy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE