American Journal of Mechanical Engineering
ISSN (Print): 2328-4102 ISSN (Online): 2328-4110 Website: http://www.sciepub.com/journal/ajme Editor-in-chief: Kambiz Ebrahimi, Dr. SRINIVASA VENKATESHAPPA CHIKKOL
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American Journal of Mechanical Engineering. 2014, 2(6), 164-168
DOI: 10.12691/ajme-2-6-3
Open AccessArticle

Pitting Corrosion Damage for Prediction Useful Life of Geothermal Turbine Blade

Cuevas-Arteaga C1, Rodriguez JA1, , Clemente CM1, Rodríguez JM2 and Mariaca Y1

1Centro de Investigación en Ingeniería y CienciasAplicadas, (CIICAp), UAEM, Cuernavaca, Morelos, Mexico

2Centro Nacional de Investigación y Desarrollo Tecnológico

Pub. Date: December 16, 2014

Cite this paper:
Cuevas-Arteaga C, Rodriguez JA, Clemente CM, Rodríguez JM and Mariaca Y. Pitting Corrosion Damage for Prediction Useful Life of Geothermal Turbine Blade. American Journal of Mechanical Engineering. 2014; 2(6):164-168. doi: 10.12691/ajme-2-6-3

Abstract

In the last years, the power industry in México has suffered the consequences of some mechanisms of damage that reduce the efficiency in power generation. These mechanisms of damage originate problems in main components as rotors, nozzle blades and others due to losses of pressure, high vibrations, erosion and corrosion. By the type of work fluid, mixture of water-steam and brine rich in salts, geothermal turbines are in a high corrosion environment. The main forms of damage caused by corrosion in a geothermal turbine are crevice corrosion and pitting corrosion. The latter is a damage mechanism through which the useful life is affected. The blades of the last stage in low pressure (LP) in the geothermal turbines are exposed to corrosion by environment and high load cycles which cause failures by corrosion fatigue, crack initiation and crack propagations. In this work, a methodology for the analysis of the failure by pitting corrosion and its consequences in its useful life was obtained. From the results, it is possible to conclude that this corrosion may influence a mechanism of pitting corrosion, which precedence to stress corrosion cracking and corrosion fatigue.

Keywords:
pitting corrosion blades of geothermal turbine useful life damage mechanisms

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