%0 Journal Article
%T Analytical Method to Monitor Industrial Pickling Baths Initially Constituted by HF, HNO<sub>3</sub>
%A Brigitte Dustou
%A Laure Latapie
%A Fabien Chauvet
%A Jean-Michel Bergerat
%A Theodore Tzedakis
%J Journal of Analytical Sciences, Methods and Instrumentation
%P 116-135
%@ 2164-2753
%D 2017
%I Scientific Research Publishing
%R 10.4236/jasmi.2017.74009
%X The present study couple<span>s</span><span> the
acid/basis titration and the ICP analysis in order to monitor the
concentrations of nitric and hydrofluoric acids, </span><span>and </span><span>presents into baths used to pickle alloys of titanium or stainless steel,
largely employed in the aeronautic industry. The pickling of the alloys release</span><span>s</span><span><span> various metallic cations able to react with HF in order to lead to
metal-fluoride complexes and free H</span><sup><span>+</span></sup><span>, the last being able to react
with the basis. In this study</span></span><span>,</span><span> </span><span>it </span><span>w</span><span>as</span><span> determined: the most significant correlations providing the number of
the protons released by the complexation of the metallic cation by the
fluoride. The proposed method based on: </span><span>1</span><span>) these
correlations</span><span>;</span><span> </span><span>2</span><span>) the titration pH</span><span> </span><span>=</span><span> </span><span><span>f(V</span><sub><span>KOH</span></sub><span>) curves</span></span><span>;</span><span> and </span><span>3</span><span><span>) the
content of metallic cations determined by ICP, enables the monitoring of the
content of HNO</span><sub><span>3</span></sub><span> and HF into the pickling bath. Assuming that one
bath was used for one type of alloy (alloys of Titanium for example, or alloys
of stainless steel), then the proposed method appears providing reliable
concentration values of both acids as well as metallic cations.
%K Pickling Bath Monitoring
%K Mix HF/HNO&lt
%K sub&gt
%K 3&lt
%K /sub&gt
%K Titration
%K Fluoride-Metallic Cations Complexation
%K Titanium Alloys Pickling
%K Stainless Steel Alloys Pickling
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=81444