Elimination Technology of the Iron Dissolved in Flux Solution of Hot Dip Galvanizing Process

Abstract:

Hot dip galvanizing is being widely used to the numerous constructional steels such as a guard rail of high way, various types of structural steel for manufacturing ship and for some other fields etc.. Recently, the cost of zinc is getting higher and higher, thus, a proper manufacturing process should be developed possibly to reduce the cost of production. one of hot dip galvanizing process, that is, flux solution immersion process is very important to control more effective coating. However, flux solution is deteriorated with increasing its using time because dissolved iron from structural steel due to continuous flux treatment was increasingly increased, which is resulted in coating badness and increment of dross. In this study, elimination of iron dissolved in flux solution was investigated with some types of inner solution which is added with additives such as seawater, NH4OH, NaOH, NH4Cl and thiourea, and electrolysis experiment was carried out with parameters of applied current density. For elimination of iron from flux solution, it is considered that inner barrel with separator should be filled with solution different from original flux solution which is involved in iron ion, that is, the inner solution which is made up seawater added with additives such as NH4Cl (5g), NaOH(0.5g) and thiourea(0.5g) is the most desirable solution to effectively extract iron from flux solution. An optimum applied current density for the most extraction effect of iron through electrolysis experiment is thought to be 20mA/cm2 .

• Periodical: Advanced Materials Research (Volumes 472-475)
• Pages: 354-357
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.472-475.354
• Online since: February 2012
• Authors: Kyung Man Moon, Min Seok Oh, Dong Hyun Park, Myung Hoon Lee
• Keywords: Additive, Dross, Electrolysis, Flux Solution, Hot Dip Galvanizing, Insoluble Anode, Separator

References

[1] B. H. Jung, M. G. Kim : J. of Kor. Soc. of Mar. Eng. Vol. 30, No. 6 (2006), p.709

[2] S. J. Kim, J. Y. Ko : J. of Kor. Soc. of Mar. Eng. Vol. 30, No. 6( 2006), p.57

[3] D. H. Youn, M. H. Lee, K. J. Kim, K. M. Moon : J. of Kor. Soc. of Mar. Eng. Vol. 29, No. 5 (2005), p.495

[4] Denny A. Jones, in : PRINCIPLES AND PREVENTION OF CORROSION, Maxwell Macmillian International Publishing Group, New York, USA, (1991), p.398

[5] The Techonlogy Center of the Coastal Development, in: Corrosion Control Manual of Harbor Steel Structure, Tokyo, Jappen, (1987), p.21

[6] W. Von Baeckmann, in: Handbook of CATHODIC CORROSION PROTECTION, Guef publishing Company, Houston Texas, USA, (1997), p.180

[7] Mars G. Fontana etc., in: Corrosion Engineering, McGraw-Hill, Inc,New Jersey, USA, (1978), p.39

[8] H. T. Youm, in: The latest Metal Surface Treatment, Dong Myung Pub. Korea, (1991), p.4