An Environmentally Friendly Passivation Technology for the Water-cooling Process of Batch Hot-dip Galvanization

DOI

10.2991/ice2me-19.2019.37How to use a DOI?

Keywords

batch hot-dip galvanizing; water-cooling medium; chromic anhydride passivation; environment-friendly passivation

Abstract

In batch hot-dip galvanizing, 0.2-0.3 wt% chromic anhydride solution is traditionally used as awater-cooling medium to prevent white rust. It generates a lot of chromium acid mist and wastewater, both of which are very harmful to humans and the environment. In our study, an environmental-friendly passivation technology as a water-cooling medium was developed for the first time. It consisted of several inorganic inhibitors to prevent zinc corrosion such as molybdate, tungstate, vanadate and phosphate. The corrosion resistance, surface morphology, chemical composition and electrochemical behavior of the samples prepared with tap water, 0.2 wt% chromic anhydride solution and new green passivation solution were compared. The new environmentally friendly passivation technology had a similar effect to that of chromic anhydride solution, thus, it had a strong industrial application potential.

Copyright

© 2019, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Yongfeng Long
AU  - Changsheng Liu
AU  - Hongxin Wen
PY  - 2019/03
DA  - 2019/03
TI  - An Environmentally Friendly Passivation Technology for the Water-cooling Process of Batch Hot-dip Galvanization
BT  - Proceedings of the 2019 International Conference on Electronical, Mechanical and Materials Engineering (ICE2ME 2019)
PB  - Atlantis Press
SP  - 166
EP  - 169
SN  - 2352-5401
UR  - https://doi.org/10.2991/ice2me-19.2019.37
DO  - 10.2991/ice2me-19.2019.37
ID  - Long2019/03
ER  -