Effect of rare earth lanthanum-cerium doping on corrosion behavior of zinc-aluminum-magnesium hot-dip galvanizing coatings used for transmission towers. Issue 2 (5th March 2018)

• Record Type: Journal Article
• Authors: Han, Yu; Xia, Yanqiu; Chen, Xin; Sun, Liang; Liu, Dongyu; Ge, Xiangyu
• Is Part Of: Anti-corrosion methods and materials. Volume 65:Issue 2(2018)
• Page Start: 131
• Page End: 137
• Publication Date: 2018-03-05
• Subjects: Corrosion behaviour -- Transmission towers -- Hot-dip galvanizing -- Rare earth (La and Ce) doping -- Zn-al-mg coating; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1108/ACMM-01-2017-1750
• Languages: English
• ISSNs: 0003-5599

Abstract

Abstract : Purpose: The purpose of this study is to improve the corrosion resistance of the transmission towers by Zinc-aluminum-magnesium (Zn-Al-Mg) coatings doped with rare earths lanthanum (La) and cerium (Ce) (denoted as Zn-Al-Mg-Re) in Q345 steel. Design/methodology/approach: The phase structure of Zn-Al-Mg-Re composite coatings has been determined by X-ray diffraction, whereas their surface morphology and cross-sectional microstructure as well as cross-sectional elemental composition have been analyzed by scanning electron microscopy and energy-dispersive spectrometry. Moreover, the corrosion resistance of Zn-Al-Mg-Re composite coatings has been evaluated by acetic acid accelerated salt spray test of copper strip. Findings: Experimental results show that doping with La and Ce favors to tune the composition (along with the generation of new phase, such as LaAl3 or Al11 Ce3 ) and refine the microstructure of Zn-Al-Mg galvanizing coatings, thereby significantly improving the corrosion resistance of the coatings. Particularly, Zn-Al-Mg-Re with 0.15% (mass fraction) La exhibits the best corrosion resistance among the tested galvanizing coatings. Originality/Value: Zinc-aluminum-magnesium (Zn-Al-Mg) coatings doped with rare earths lanthanum (La) and cerium (Ce) (denoted as Zn-Al-Mg-Re) have been prepared on Q345 steel substrate by hot-dip galvanizing so as to improve the corrosion resistance of the transmission towers, and to understand the corrosion inhibition of the Zn-Al-Mg-Re coating.