Corrosion Properties of Steel Sheet with Zinc-base Alloyed Coatings

doi:10.11902/1005.4537.2016.101

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (4): 354-359 DOI: 10.11902/1005.4537.2016.101

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Corrosion Properties of Steel Sheet with Zinc-base Alloyed Coatings

Guangrui JIANG^1,²(

), Haiquan WANG^1,^2,³, Min LI¹, Guanghui LIU^1,², Chunqian XIE^1,²

1 Shougang Group Co., Ltd. Research Institute of Technology, Beijing 100043, China
2 Beijing Key Laboratory of Green Recyclable Process for Iron & steel Production Technology, Beijing 100043, China
3 National Engineering Lab of Advanced Coating Technology for Metal Materials, China Iron and Steel Research Institute Group (CISRI), Beijing 100081, China

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Abstract

Three hot-dip galvanizing coatings i.e. pure Zn, Zn-5%Al and Zn-2%Al-2%Mg were prepared respectively on sheets of a commercial interstitial free (IF) steel by a hot-dip process simulator (HDPS). Corrosion behavior of the coated steel sheets was studied by means of immersion test, electrochemical measurement and scanning electron microscope (SEM). Results show that the Zn-Al-Mg coating has the largest corrosion current density at the early stage of immersion. While with the increasing immersion time, the corrosion current density of the Zn-Al-Mg decreases but those of the pure Zn and Zn-5%Al coatings increase. For the Zn-5%Al coating, diffusion characteristics could be found for its Nyquist curve, which means higher corrosion rate. However, for the Zn-Al-Mg coating, limited diffusion characteristics could be found for its Nyquist curve, which means a perfect coverage of corrosion products on the coating surface, in other word, the corrosion resistance was enhanced.

Key words: steel sheet Zn-Al-Mg coating corrosion resistance Galfan coating hot-dipping

Received: 19 July 2016

ZTFLH:

TG172

Fund: Supported by Beijing Science and Technology Project (D15110300350000)

About author:

These authors contributed equally to this work.

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Cite this article:

Guangrui JIANG, Haiquan WANG, Min LI, Guanghui LIU, Chunqian XIE. Corrosion Properties of Steel Sheet with Zinc-base Alloyed Coatings. Journal of Chinese Society for Corrosion and protection, 2017, 37(4): 354-359.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2016.101 OR https://www.jcscp.org/EN/Y2017/V37/I4/354

Table 1 Chemical compositions of three zinc alloys (mass fraction / %)

Fig.1 Surface morphologies of pure zinc coating after immersion in 3.5%NaCl solution for 25 h (a), 125 h (b) and 300 h (c)

Fig.2 Surface morphologies of Galfan coating after immersion in 3.5%NaCl solution for 25 h (a), 125 h (b) and 300 h (c)

Fig.3 Surface morphologies of Zn-Al-Mg coating after immersion in 3.5%NaCl solution for 25 h (a), 125 h (b) and 300 h (c)

Fig.4 Potential-time curves of Fe and three zinc alloy coatings in 3.5%NaCl solution

Fig.5 Polarization curves of the steel sheets with three zinc-alloy coatings after immersion in 3.5%NaCl solution for 25 h (a), 125 h (b) and 300 h (c)

Fig.6 Corrosion potential (a) and corrosion current density (b) of the steel sheets with three zinc-alloy coatings after immersion in 3.5%NaCl solution for different time

Fig.7 Nyquist plots of the steel sheets with different zinc-alloy coatings after immersion in 3.5%NaCl solution for 25 h (a), 125 h (b) and 300 h (c)

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