Chemistry:Zinc ammonium chloride
| Names | |
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| IUPAC name
diammonium tetrachlorozincate(2-)
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| Identifiers | |
| ChemSpider | |
| EC Number |
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PubChem CID
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| UNII | |
| Properties | |
| Cl4H8N2Zn | |
| Molar mass | 243.26 g·mol−1 |
| Density | 1.91 g/cm3 |
| Hazards | |
| GHS pictograms |   
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| GHS Signal word | Danger |
| H302, H314, H315, H400, H411 | |
| P260, P264, P270, P273, P280, P301+312, P301+330+331, P302+352, P303+361+353, P304+340, P305+351+338, P310, P321, P330, P332+313, P362, P363, P391, P405, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Zinc ammonium chloride is the inorganic compound with the formula (NH4)2ZnCl4. It is the ammonium salt of tetrachlorozincate. It used as a flux in the process of hot-dip galvanizing.[1][2][3]
Uses
Steel to be galvanized passes through an acidic cleaning process to remove iron oxide "mill scale". After this process, the surface of the steel is very active and oxide layers begin forming immediately upon exposure to the atmosphere. Zinc ammonium chloride flux in aqueous solution is applied to the steel to reduce any oxides that are formed and/or inhibit them from forming altogether. This allows the molten zinc in the proceeding galvanizing step to maximally adhere to and alloy with the surface of the steel.[4][5]
Precautions
Zinc ammonium chloride is a Class 9 hazardous material (Miscellaneous) according to the U.S. DOT.
References
- ↑ Zinc Ammonium Chloride
- ↑ Vulte, H.T. (1902). Laboratory Manual of Inorganic Preparations. Read Books. p. 72. ISBN 1408608405.
- ↑ Hironori Matsunaga (1982). "X-Ray Structural Study of the Successive Phase Transitions in Ammonium Tetrachlorozincate, (NH4)2ZnCl4. I. Crystal Structure Determination". J. Phys. Soc. Jpn. 51 (3): 864–872. doi:10.1143/JPSJ.51.864. Bibcode: 1982JPSJ...51..864M.
- ↑ "The Hot-Dip Galvanizing Process". V&S Hot Dip Galvanzing. http://www.hotdipgalvanizing.com/hot_dip_galvanizing_process/index.html.
- ↑ "Galvanizing Fluxes". Zaclon LLC. http://www.zaclon.com/prods_galvflux.html.
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