Journal of the Microelectronics and Packaging Society (마이크로전자및패키징학회지)

The Korean Microelectronics and Packaging Society (한국마이크로전자및패키징학회)
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Study on Influencing Factors of Adhesive Strength for Polymer Coating on Metal Adherend by Dolly Test

돌리테스트로 고분자 코팅층과 금속 피착재의 접착강도 측정시 영향인자에 대한 연구

  • Baeg, Ju-Hwan (Division of Materials Science and Engineering, Pusan National University) ;
  • Park, Hyun (Department of Navel Architecture and Ocean Engineering, Pusan National University) ;
  • Lee, Sung In (Dongsung Chemtech) ;
  • Ha, Yungeun (Division of Materials Science and Engineering, Pusan National University) ;
  • Cho, Young-Rae (Division of Materials Science and Engineering, Pusan National University)
  • 백주환 (부산대학교 재료공학부) ;
  • 박현 (부산대학교 조선해양공학과) ;
  • 이성인 (동성켐텍) ;
  • 하윤근 (부산대학교 재료공학부) ;
  • 조영래 (부산대학교 재료공학부)
  • Received : 2019.06.04
  • Accepted : 2019.06.25
  • Published : 2019.06.30
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Abstract

The demand and importance of adhesives and paint coatings applied to solid surfaces such as metals, ceramics, and plastics are increasing. In this study, the influencing factors on the adhesive strength between the polymer coating and the metal adherend were investigated by Dolly test when the adhesive or the paint coating was applied on the metal adherend. Two-component epoxy adhesive was used as the adhesive, and EH2350, a two-component epoxy paint for anti-corrosion, was used as the paint. Especially, the effect of adherend metals(Al, Fe, STS, Cu, Zn), surface roughness and surface contamination(tap water, salt water) on adhesive strength was studied as influencing factors. The adhesive strength between adhesive and adherend was different when the type of metal adherend was different even when the same adhesive was used. It was found that spray water cleaning was necessary before the paint coating process on the surface of the oxide contaminated adherend with tap water or salt water. As a result of this study, it was confirmed that Dolly test can be widely used in the future to measure adhesive strength between paint coating and adherend.

금속, 세라믹스, 플라스틱 등 고체의 표면에 적용되는 접착제와 페인트 도장막의 수요와 중요성은 점점 증가하고 있다. 본 연구에서는 금속 피착재에 고분자 재료인 접착제 혹은 페인트 도장막을 적용할 때, 이들 고분자 코팅층과 금속 피착재 사이의 접착강도 측정시 영향인자에 대한 연구를 돌리테스트로 수행하였다. 접착제로는 2액형 에폭시 접착제가 사용되었으며, 페인트로는 방청용 2액형 에폭시 페인트인 EH2350가 사용되었다. 특히, 영향인자로는 피착재의 종류(Al, Fe, STS, Cu, Zn), 표면거칠기 및 표면오염(수돗물, 소금물) 등을 선택해서 접착강도에 미치는 영향에 대해 연구하였다. 접착제와 피착재의 접착강도는 동일한 접착제를 사용해도 피착재의 종류가 달라지면 다르게 나타났으며, 수돗물 혹은 소금물로 산화 오염된 피착재의 표면은 페인트 도장공정 이전에 수돗물로 스프레이 세척이 필수적임을 알았다. 본 연구의 결과로 돌리테스트는 도장막과 피착재의 접착강도를 측정하는데 향후 널리 사용될 수 있음을 확인하였다.

Keywords

MOKRBW_2019_v26n2_1_f0001.png 이미지

Fig. 1. Schematic of Dolly test for pull-off adhesion strength measurement: 1, 2, and 5 are belong to adhesive failure, however, 2 and 4 are belong to cohesive failure.

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Fig. 2. Photos of dollys made from different metals such as Al, Cu, Fe, STS and Zn.

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Fig. 3. Surface of adherend and dolly after Dolly test for different dolly metals.

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Fig. 4. Adhesive strength of Araldite standard adhesive on different dolly metals.

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Fig. 5. Results of pull-off adhesion test: (a) adhesive strength of paint coating on adherend for different surface roughness, (b) and (c) are photos of surface after Dolly test.

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Fig. 6. Photos of contaminated surface by tap water: (a) and (b) are the specimen before and after spray water cleaning, respectively.

MOKRBW_2019_v26n2_1_f0007.png 이미지

Fig. 7. Comparison of contaminated area measured by OM image and ImageJ program for the specimens contaminated by tap water.

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Fig. 8. Adhesive strength of paint coating on adherend for contaminated adherend surface: (a) and (b) are the specimen before and after spray water cleaning, respectively.

MOKRBW_2019_v26n2_1_f0009.png 이미지

Fig. 9. SEM image and EDS peaks for contaminated adherend surface: (a) and (b) are contaminated by tap water, (c) and (d) are contaminated by salt water.

Table 1. Specification and properties of metals for dolly

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