Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
권호 표지

A Study of Corrosion Resistance and Torque in Bolt Coated with Magni 565

Magni 565 코팅 볼트의 내식성 및 토오크 특성에 대한 연구

  • 김상수 (광림 C&T) ;
  • 김무길 (부경대학교 신소재공학부 금속시스템공학과) ;
  • 정병호 (부경대학교 신소재공학부 금속시스템공학과)
  • Received : 2007.06.12
  • Accepted : 2007.07.05
  • Published : 2007.07.30
Download PDF
⟨ Previous Next ⟩

Abstract

Corrosion resistance and torque of M10 bolt coated with Magni 565 were investigated. Corrosion protection mechanism were also studied with the microstructure of coating film. The bolts with the optimum conditions showed around $10{\mu}m$ layer thickness, a great corrosion resistance in salt spray test and a proper torque in torque/tension test. But torque coefficient k increased with the number of bolting and clamping force of M10 bolt showed significantly lower than that of specified value 28.3kN. It was thought that the repeated bolting made the coating film peel off and powdery. The sample coated with optimum coating conditions showed more higher polarization resistance and corrosion potential than the specimens of top and base coat only. The base coating film was composed of lamellar zinc flakes, which provides a large sacrificial cathodic protection. Meanwhile, the top coating film was composed of organic aluminium pigments layer, which provides barrier protection to the corrosion circumstances.

Keywords

References

  1. 한국 다크로 공업회 : 다크로(Dacro) 처리 핸드북, 아연말 화성피막처리 1월 (1996)
  2. Michael Wyrostek and Paul Wynn : Driving away from hex chrome coatings, Metal Finishing, April (2006) 1-3
  3. Metal coatings international, Inc. : Geomet coating, A completely chromium-free coating, Chardon, Ohio USA
  4. The Magni Group, Inc. : Magni 500 series, Highperformance fastener/hose clamp coatings, Magni 565
  5. Knut Westphal, Hermann Kohler; Chromatfreie Korrosionsschutzsysteme fur Verbindungselemente, Korrossionsschutz am Automobil, 29/30, Sept. (2003)
  6. Anochrome Ltd. : Design guide, Surface finishing technology, May (2001) 1-19
  7. S. S. Kim, M. G. Kim, B. H. Jung and M. J. Moon: J.Kor. Soc. Heat Treatment, 19 (2006) 203-204
  8. 한국 공업 표준 협회 : KS 핸드북, 86-87, 철강 (1986) 192
  9. General Motors Engineering Standard : GM 9064p, Torque tension test, Octo. (1989)
  10. Magni applicator: Tape adhesion test guider, Delphi D $\times $ 900161
  11. GM : Non-electrolytically applied zinc rich coating, GMW 3359, Octo. (2004) 2
  12. Denny A. Jones : Principles and prevention of corrosion, MacMillian Pub., (1996) 143-145
  13. GalvInfoNote. 7 : Protecting galvanized steel sheet products from storage stain, Aug. (2003) 2
  14. Magni Industries, Inc. : Material safety data sheet of B06J and B18 (2004)
  15. Michel Lonca, Dacral SA. : Corrosion protection, Dacratizing-an effective protection against corrosion, Sept. (1990) 35
  16. S. J. Park, J. S. Kim and C. W. Nah : Elastomer, 35 (2000) 98-105
  17. Ford Motor Company: Worldwide fastener standard WZ 101, Steel metric threaded fastener torque/ clamping force performance (2002) 2