Abstract
Corrosion rates and anode polarization curves of RE-Ni-W-P-SiC-PTFE composite coatings in various concentrations of sulfuric acid and hydrochloric acid solutions have been studied. Results show that corrosion law of the RE-Ni-W-P-PTFE-SiC composite coatings in various concentrations of sulfuric acid solutions is identical. The corrosion rates of the composite coatings are increased with increasing sulfuric acid concentration while the corrosion rates are decreased with increasing concentration of hydrochloric acid. Anode polarization curves of RE-Ni-W-P-SiC-PTFE composite coatings in various concentrations of sulfuric acid and hydrochloric acid solutions have showed that anode polarization electric current density of the composites at 200°C or 500°C heat treatment was below that at other heat treatment, it is clear that the composite coatings at 200°C or 500°C heat treatment has better corrosion resistance.
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