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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 630 pages |
| ISBN: | 978-0-9879917-2-0 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
Electrochemical Corrosion Of Niquel In Sodium Chloride –sulfuric Acid Solutions At Different Concentration Ratios Using The Polarization Resistance Method
Baldemar Martinez1; Angélica Oropeza Amador1;1INSTITUTO POLITECNICO NACIONAL, México D.F., Mexico;
Type of Paper: Regular
Id Paper: 262
Topic: 6
Abstract:
Specimens of Ni were conditioned in the test piece with a work area of 0.2 cm2, each one of them was polished and using as work electrode , graphite electrode and platinum electrode were used as reference electrode and counter electrode respectively.The work electrode was changing each test. The concentration ratios were 1N NaCl, 1N NaCl : 0.8N H2SO4 and 1N NaCl : 1N H2SO4 with the volume ratio 1:1 in all cases. The presence of H2SO4 increase the corrosion rate. The corrosion current intensity was determinated by polarization resistance method.The scanning rate was 2 mV per second. Due to the acid medium provides favorable conditions to the oxide film formed on the niquel surface become in a no resistance film, which is broke out, and consequently exist a pitting surface. The calculation showed a considerable increasing corrosion rate with the acid enviroment; however the pH plays an important role since it has a strong relation with the H2SO4 concentration.