3가 크롬황산염의 크로메이트에 의한 아연도금내식성 증대

이철태; Chul-Tae Lee

Journal of the Korean Industrial and Engineering Chemistry, Vol.18, No.3, 296-302, June, 2007

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3가 크롬황산염의 크로메이트에 의한 아연도금내식성 증대

Enlargement of Anti-corrosion of Zinc Plating by the Trivalent Chromium Sulfate Conversion Coating

이철태 ^†

단국대학교 공학부 화학공학전공

Chul-Tae Lee^†

Department of Chemical Engineering, Dankook University, Seoul 140-714, Korea

E-mail:

초록

6가 크롬의 크로메이트 코팅제의 대체를 위한 3가 크롬의 크로메이트 코팅용액의 제조에 관한 것이다. 본 연구에서 제안된 코팅제는 3가 크롬원으로서 KCr(SO4)2를 35∼45 g/L, 인산계 화합물로서 NaH2PO4를 20∼30 g/L을 주성분으로 하고 여기에 금속계 황산화물로서 CoSO4 10∼20 g/L, ZnSO4 10∼20 g/L의 조성으로 구성된 것이다. 이 제안된 3가 크롬 코팅용액을 사용하여 pH 2.0∼2.2, 상온에서 담지시간 20∼25 s의 조건하에 시안아연도금체에 코팅된 피막은 염수분무시험결과 5% 백청발생까지 120 h 이상 견디는 우수한 내식성을 발현하였다.

A trivalent chromate conversion coating solution which is composed with KCr2(SO4) as main component was investigated to test a feasibility of use as an alternative six-valent chromate conversion coating for improvement of anti-corrosion of zinc plating. The proposed trivalent convesion coating was consisted of KCr(SO)4 35∼45 g/L as trivalent chromium source, NaH2PO4 20∼30 g/L as phosphate, CoSO4, 10∼20 g/L, ZnSO4 10∼20 g/L as metallic sulfates. This trivalent chromate films which are coated by this chromate conversion coating solution under pH 2.0∼2.2, immersion time of 20∼25 s at room temperature are able to achieve over 120 h in neutral salt spray test to 5% white rust.

Keywords:trivlaent chromate;coating;corrosion;surface treatment

[References]

Kim SW, Lee CT, J. Korean Ind. Eng. Chem., 17(5), 433 (2006)
Lee CT, J. Korean Ind. Eng. Chem., 12(8), 831 (2001)
The Environment Agency, www.environmentagency.gov.uk. (2006)
Dirctive 2002/95/EC of European Parliament and Council (2002)
J. Korean Institute of Surface Engineering, 34, 68 (2001)
Klos KP, U.S. Patent 5, 368, 655 (1994)
Preikschat P, U.S. Patent 6, 946, 201 (2005)
E.William & F. Rob, Plating & Surface Finishing, Jan. 24 (2007)
Burns DT, Townshend A, Carter AH, Inorganic Reaction Chemistry, 2,140, Ellis Horwood, Chichester (1981)
Patricia Preikschat, Roll Jansen, Galvanotechnik, Jahrg. 54, 49 (2000)
KS D 9502 (2005)
KS D 8350 (2003)

[Related Articles]

[1] Kim SW, Lee CT, J. Korean Ind. Eng. Chem., 17(5), 433 (2006)

[2] Lee CT, J. Korean Ind. Eng. Chem., 12(8), 831 (2001)

[3] The Environment Agency, www.environmentagency.gov.uk. (2006)

[4] Dirctive 2002/95/EC of European Parliament and Council (2002)

[5] J. Korean Institute of Surface Engineering, 34, 68 (2001)

[6] Klos KP, U.S. Patent 5, 368, 655 (1994)

[7] Preikschat P, U.S. Patent 6, 946, 201 (2005)

[8] E.William & F. Rob, Plating & Surface Finishing, Jan. 24 (2007)

[9] Burns DT, Townshend A, Carter AH, Inorganic Reaction Chemistry, 2,140, Ellis Horwood, Chichester (1981)

[10] Patricia Preikschat, Roll Jansen, Galvanotechnik, Jahrg. 54, 49 (2000)

[11] KS D 9502 (2005)

[12] KS D 8350 (2003)