2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 5: Composite, Ceramic, Quasi-crystals, Nanomaterials & Coatings
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 578 pages |
| ISBN: | 978-1-987820-07-2 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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DETERIORATION OF STAINLESS STEEL USED IN THE METALLIC INDUSTRY OF MEXICALI BY THE DIFFUSIVITY OF CARBON
Gustavo Lopez1;1INSTITUTO TECNOLOGICO DE MEXICALI, Mexicali, Mexico;
Type of Paper: Regular
Id Paper: 127
Topic: 14
Abstract:
The corrosion process can occur in the operations of the metallic industry indoors, located in Mexicali, which is considered as an arid zone city in the northwest of Mexico. The reason why it happens is related to the extreme values of relative humidity (RH) and to the temperature, considered as a climatic factor with ranges higher than 90% of RH in some months of summer and winter, 45 C in summer and less than 10°C in winter. This climatic parameter, combined with the concentration levels of sulfates that exceed the air quality standards (AQS), generates aggressive environments in the indoors of the metallic industry of Mexicali. These factors originate the corrosion process if the SS is the process of thermal diffusivity of carbon in this type of material, reducing their corrosion resistance. Industrial operations at high temperatures, where are added chrome to the steel in order to increase the corrosion resistance, show good results with controlled environments in closed rooms. However, with uncontrolled environments, aggressive atmospheres in the indoors of the metallic industry are formed and the inter-granular corrosion (IC) occurs because of the chromium high affinity and the presence of carbon, hidden in some types of SS used in this kind of industry of this city. Since the carbon has good diffusivity, it creates a chrome drag to where the carbon is in the grain boundary, causing IC. In this case, and in other zones of the SS, low chromium levels and this process, associated with the increase and maintenance of the temperature between 450°C to 850°C, provoke the corrosion phenomena attack. For this reason, a characterization study, using the Scanning Electron Microscopy (SEM), was made to detect the minimum and maximum concentration levels of sulfurs that generate the electrochemical process in the SS manufactured in the company evaluated.