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首页> 外文期刊>journal of applied polymer science >Cathodic delaminations of poly(phenyl ether ether ketone) (PEEK) coatings overlaid on zinc phosphate‐deposited steels
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Cathodic delaminations of poly(phenyl ether ether ketone) (PEEK) coatings overlaid on zinc phosphate‐deposited steels

机译：Cathodic delaminations of poly(phenyl ether ether ketone) (PEEK) coatings overlaid on zinc phosphate‐deposited steels

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AbstractThe melt‐crystallized poly(phenyl ether ether ketone) (PEEK) polymer was overlaid on crystalline zinc phosphate (Zn • Ph) conversion coating‐deposited and nondeposited coldrolled steels at 400°C in air or in N2environments. The ability of these coating systems to protect the steel against corrosion was evaluated from the rate of cathodic delamination of the coating layer from the steel. Because the cathodic reaction, H2O + 1/2O2+ 2e−= 2OH−, at the corrosion side of a defect in the coating layer creates a high pH environment at the interfacial boundary between the coating and steel, the magnitude of susceptibility of the interfacial intermediate layers to the alkali‐induced degradation played a key role in suppressing cathodic failure. The lowest level was observed in the N2‐induced PEEK/Zn • Ph/steel joint systems, thereby decreasing the rate of delamination. By contrast, oxidized PEEK induced by air in same joint systems was susceptible to the alkali‐catalyzed hydrolysis. This phenomenon significantly promoted the alkali dissolution of Zn • Ph crystals, reflecting a high rate of delamination. Nevertheless, the introduction of Zn • Ph as interfacial tailoring material into the intermediate layers markedly acted in reducing the cathodic delamination of PEEK/steel joint systems. © 19

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