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Pitting Corrosion Damage for Prediction Useful Life of Geothermal Turbine Blade

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

2Centro Nacional de Investigación y Desarrollo Tecnológico


American Journal of Mechanical Engineering. 2014, Vol. 2 No. 6, 164-168
DOI: 10.12691/ajme-2-6-3
Copyright © 2014 Science and Education Publishing

Cite this paper:
Cuevas-Arteaga C, Rodriguez JA, Clemente CM, Rodríguez JM, 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.

Correspondence to: Rodriguez  JA, Centro de Investigación en Ingeniería y CienciasAplicadas, (CIICAp), UAEM, Cuernavaca, Morelos, Mexico. Email: jarr@uaem.mx

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.

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