Product category:
Materials Testing
News Release from: Multitrator | Subject: Multitrator
Edited by the Manufacturingtalk Editorial
Team on 17 September 2003
Multitrator Analyzes Pre-Flux Solutions
Part of the surface preparation of steel for galvanising involves treating with a "pre-flux" solution containing ammonium and zinc chlorides.
The surface of steel which is subject to galvanizing (coating with zinc) has to be prepared for the plating process Part of this surface preparation involves treating with a "pre-flux" solution containing ammonium and zinc chlorides
This article was originally published on Manufacturingtalk on 2 Sep 2003 at 8.00am (UK)
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Acetic anhydride is a very useful industrial reagent (if somewhat unpleasant to handle).
It is important to monitor the concentration of both ammonium and zinc ions, as well as measuring the ferrous ion content of the solution, an indicator of corrosion of the steel surface.
Multitrator determines both the ammonium and zinc concentrations in a single acid/base titration sequence.
The ammonium content is reacted with formaldehyde, forming hexamethylene tetramine ("hexamine") and protons (acid).
After reaction, the solution is titrated with standard sodium hydroxide to give two endpoints, The first endpoint represents the acid produced by the reaction of the ammonium with formaldehyde.
The second endpoint represents the hydrolysis of the Zn(II) aquo ion to form zinc hydroxide.
The determination of both the ammonium and zinc contents is highly precise.
The ferrous ion content is easily determined by a thermometric redox titration using potassium dichromate as the titrant.
Multitrator is able to offer a compact two burette system to handle this analytical task.
With appropriate training, it is suitable for use by relatively unskilled operators in a field laboratory environment.
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