Analytical Method to Monitor Industrial Pickling Baths Initially Constituted by HF, HNO3 - Journal of Analytical Sciences, Methods and Instrumentation

JASMI > Vol.7 No.4, December 2017

Analytical Method to Monitor Industrial Pickling Baths Initially Constituted by HF, HNO₃ ()

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Download as PDF (Size: 1507KB) PP. 116-135

DOI: 10.4236/jasmi.2017.74009 2,553 Downloads 5,360 Views Citations

Author(s)

Brigitte Dustou¹, Laure Latapie^1*, Fabien Chauvet¹, Jean-Michel Bergerat², Theodore Tzedakis^1*

Affiliation(s)

¹LGC UMR CNRS 5503, Université de Toulouse III-Paul Sabatier, Toulouse, France.
²Airbus, Campus 2-Building B23-Module 04-Room 0411, 1 Rond-Point Maurice Bellonte, Blagnac, France.

ABSTRACT

The present study couples the acid/basis titration and the ICP analysis in order to monitor the concentrations of nitric and hydrofluoric acids, and presents into baths used to pickle alloys of titanium or stainless steel, largely employed in the aeronautic industry. The pickling of the alloys releases various metallic cations able to react with HF in order to lead to metal-fluoride complexes and free H⁺, the last being able to react with the basis. In this study, it was 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: 1) these correlations; 2) the titration pH = f(V_KOH) curves; and 3) the content of metallic cations determined by ICP, enables the monitoring of the content of HNO₃ 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.

KEYWORDS

Pickling Bath Monitoring, Mix HF/HNO₃ Titration, Fluoride-Metallic Cations Complexation, Titanium Alloys Pickling, Stainless Steel Alloys Pickling

Share and Cite:

Dustou, B. , Latapie, L. , Chauvet, F. , Bergerat, J. and Tzedakis, T. (2017) Analytical Method to Monitor Industrial Pickling Baths Initially Constituted by HF, HNO₃. Journal of Analytical Sciences, Methods and Instrumentation, 7, 116-135. doi: 10.4236/jasmi.2017.74009.

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