인산망간 피막의 아질산나트륨 첨가가 내식성에 미치는 영향에 대한 연구
Effect of Sodium Nitrite Addition on the Corrosion Resistance of Manganese Phosphate Coating
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
This paper describes an effective metal finishing technology for obtaining manganese phosphate coatings on steel. In this study, the effect of sodium nitrite addition on the corrosion resistance of a manganese phosphate coating was investigated. The microstructure, surface morphology, and chemical composition were analyzed by FE-SEM, EDS, and XRD, while the cross-sectional images and thickness of the coating layer were analyzed by FIB. According to the results of the EDS analysis, the main components of the manganese phosphate coating were C, O, P, Mn, and Fe. The XRD results showed that (Mn,Fe)5H2(PO4)4 4H2O in the manganese phosphate coating layer was formed by a chemical reaction between manganese phosphate and elements in the underlying carbon steel. Additionally, electrochemical polarization testing was carried out in order to evaluate the corrosion protection properties of the manganese phosphate coating in a 3.5 wt.% NaCl solution. The corrosion resistance of the phosphate coating was remarkably improved by adding sodium nitrite.
Abstract
This paper describes an effective metal finishing technology for obtaining manganese phosphate coatings on steel. In this study, the effect of sodium nitrite addition on the corrosion resistance of a manganese phosphate coating was investigated. The microstructure, surface morphology, and chemical composition were analyzed by FE-SEM, EDS, and XRD, while the cross-sectional images and thickness of the coating layer were analyzed by FIB. According to the results of the EDS analysis, the main components of the manganese phosphate coating were C, O, P, Mn, and Fe. The XRD results showed that (Mn,Fe)5H2(PO4)4 4H2O in the manganese phosphate coating layer was formed by a chemical reaction between manganese phosphate and elements in the underlying carbon steel. Additionally, electrochemical polarization testing was carried out in order to evaluate the corrosion protection properties of the manganese phosphate coating in a 3.5 wt.% NaCl solution. The corrosion resistance of the phosphate coating was remarkably improved by adding sodium nitrite.
참고문헌 (21)
- L. Lazzarotto, "The effects of processing bath parameters on the quality and performance of zinc phosphate stearate coatings", Surface and Coatings Technology, 122(2-3), pp.94~100 (1999)
- D. He, "A study of the viscoelasticity of zinc phosphate coatings using a quartz crystal impedance system", Surface and Coatings Technology, 126(2-3), pp.225~231 (2000)
- B. Gruss, "PRETREATMENT-Cleaning and Surface Preparation", Metal finishing, 98(6), pp.17~25 (2000)
- M. Wolpers, "Activation of galvanized steel surfaces before zinc phosphating — XPS and GDOES investigations", Applied Surface Science, 179(1-4), pp.281~291 (2001)
- L. Fedrizzi, "Study of the corrosion behaviour of phosphatized and painted industrial water heaters", Progress in Organic Coatings, 42(1-2), pp.65~74 (2001)
- C. T. Lin, "Green chemistry in situ phosphatizing coatings", Progress in Organic Coatings, 42(3-4), pp.226~235 (2001)
- G. Gorecki, "Function of final (seal) rinses in a phosphating operation", Metal Finishing, 98(6), pp.97~101 (2000)
- S. Carpenter, "One-step, no-rinse cleaning and phosphating", Metal Finishing, 100(4), pp.73~76 (2002)
- I.M. Zin, "Corrosion control of galvanized steel using a phosphate", calcium ion inhibitor mixture, 2003, pp.45(4), 777~788
- O. Pawlig, "Vibrational analysis of iron and zinc phosphate conversion coating constituents", Spectrochimica Acta Part A : Molecular and Biomolecular Spectroscopy, 57(3), pp.581~590 (2001)
- Gorecki, G, "Improved iron phosphate corrosion resistance by modification with metal ions", Metal Finishing, 93(3), pp.36~39 (1995)
- B. Gruss, "Iron phosphating", Metal Finishing, 97(5), pp.65~68 (1999)
- J.P. Servais, "Thermal and chemical stability of phosphate layers during car body corrosion", Materials performance., Materials performance, 27(11), pp.56~61 (1988)
- W.J. van Ooij, "Chemical and thermal stability of phosphate layers on cold-rolled and electrogalvanized steels", Journal of coatings technology, 61(778), pp.51~65 (1989)
- D. Weng, "Corrosion and protection characteristics of zinc and manganese phosphate coatings", Surface and Coatings Technology, 88(1–3), pp.147~156 (1997)
- Ph. Hivart, "Annealing improvement of tribological properties of manganese phosphate coatings", Wear, 219, pp.195~204 (1998)
- T.S.N. Sankara Narayanan, "Influence of various factors on phosphatability-an overview", Metal Finishing(USA), 94(6), pp.86~90 (1996)
- L. Fedrizzi, "Study of the corrosion behaviour of phosphatized and painted industrial water heaters", Progress in Organic Coatings, 42(1-2), pp.65~74 (2001)
- K. Ogle, "The alkaline stability of phosphate coatings I: ICP atomic emission spectroelectrochemistry", Corrosion Science, 46(4), pp.979~995 (2004)
- V. A. Kumari, "Sodium Molibdate for the Effective Protection of Steel", Corrosion Prevention & Control, pp.83~96 (2001)
- D. Weng, "Effect of sodium nitrite-borax blend on the corrosion rate of low carbon steel in industrial water medium", Corrosion Science, 50, pp.2939~2947 (2008)