ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
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 PPS/Zn · Ph joints were as follows: (1) the chemical reaction of PPS with Fe2O3 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 PPS/Zn · Ph joints against a hot H2SO4 solution, the cathodic reaction, H2O + ½O2 + 2e- = 2OH-, occurring at any defect in the PPS/Zn · 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 PPS/Zn · Ph systems was considerably lower compared with that for the PPS/steel system in the absence of Zn · Ph.
Additional Material:
11 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1992.070450717
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