한국표면공학회지 (Journal of the Korean institute of surface engineering)

  • 제52권3호
  • /
  • Pages.156-162
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  • 2019
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  • 1225-8024(pISSN)
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  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
권호 표지
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pH에 따른 무전해Ni-P-PTFE 복합도금의 표면형상 및 내식성에 대한 특성 연구

Characterization of the Morphology and Corrosion Resistance in Electroless Ni-P-PTFE Composite Coating Prepared by Different pH Value

  • 투고 : 2019.05.29
  • 심사 : 2019.06.28
  • 발행 : 2019.06.30
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초록

Electroless Ni-P coatings are widely used in the chemical, mechanical, and electronic industries because of their excellent wear and abrasion resistance. In this study, The influence of pH values on properties of Ni-P-PTFE composite coatings was investigated. To improve mold lubrication, Ni-P-PTFE composite coatings at different pH value were studied. The morphology and phase structure of Ni-P-PTFE composite coatings were analyzed by scanning electron microscopy(SEM) and X-ray diffractometry(XRD). The result showed that Ni-P-PTFE composite coating is composed of Ni, P and PTFE. It exhibits an amorphous structure and good Corrosion Resistance to the substrate. Ni-P-PTFE composite coatings have higher open circuit potential than that of the substrate, which obtained at pH value of 5.0 optimal integrated properties.

키워드

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Fig. 1. Flow chart of electroless Ni-P-PTFE composite coatings at different pH values.

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Fig. 2. Surface morphology images of electroless Ni-P-PTFE composite coatings at different pH values; (a) 4.0, (b) 5.0, (c) 6.0, and (d) 7.0.

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Fig. 3. EDS analysis of electroless Ni-P-PTFE composite coatings at different pH values.

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Fig. 4. Cross-section morphology images of electroless Ni-P-PTFE composite coatings at different pH values; (a) 4.0, (b) 5.0, (c) 6.0, and (d) 7.0.

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Fig. 5 XRD analysis of electroless Ni-P-PTFE composite coatings at different pH values; (a) 4.0, (b) 5.0, (c) 6.0, and (d) 7.0.

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Fig. 6. Hardness of electroless Ni-P-PTFE composite coatings at different pH values.

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Fig. 7. Potentiodynamic polarization curves of electroless Ni-P-PTFE composite coatings at different pH values.

Table. 1. Composition and procedure conditions of electroless Ni-P-PTFE composite bath.

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Table. 2. Chemical composition (wt%) by the EDS analysis on Ni-P-PTFE composite coatings at different pH values.

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Table. 3. Hardness values of electroless Ni-P-PTFE composite electrolyte at different pH values.

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Table. 4. Results of tafel analysis of electroless Ni-P-PTFE composite electrolyte at different pH values.

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