Abstract

LOPEZ BADILLA, Gustavo et al. Corrosion of electronic devices by atmospheric corrosion in indoor of industrial plants of arid and marine enviroments. Nova scientia [online]. 2011, vol.3, n.5, pp.11-28. ISSN 2007-0705.

The electronics industry has grown over the last fifty years, particularly in developed countries, contributing to its economic progress. Particularly in the State of Baja California in northwest Mexico, these companies have successful in the industrial parks of Mexicali city considered as a arid zone and in Ensenada, a city and port located in the Pacific Ocean region with marine environment. In both cities during the winter and summer the main climatic factors in indoor environments of industrial plants are the humidity and temperature, which added with air pollutants as H₂S and SO_X in Mexicali and chloride in Ensenada, generate corrosion in the electronic devices and equipments and decreases their operational yielding. Climate change in indoors of electronics industry is due to the variation of moisture, temperature and concentration higher than enviromental standards of air pollutants such as sulfurs, CO, NO_X, O₃ and particulate matter PM_2.5 and PM₁₀ from the outdoors that penetrate to indoors by holes and air conditioning systems. Gaseous and particulate air pollutants are monitored by Environmental Monitoring Stations (EMS) in Mexicali, while SO_X and Cl were determined in Ensenada by the technique of sulfatation plates (TSP) and the wet candle method (WCM). The metal specimens in both cities were analyzed by scanning electron microscopy (SEM) and Auger electron spectroscopy (AES) to determine the corrosion products. Electronic equipments installed in the plants are constituted by components of copper, for its good electrical and thermal conductivity. They are exposed to a wide range of harsh environments, and caused deterioration of the copper, causing equipment failures and thereby economic losses. Variations of relative humidity and temperature generate the time of wetness (TOW), which cause formation of a thin film of water on the metal surface, in addition to the main air pollutants as sulfides in Mexicali and chlorides in Ensenada, generate the corrosion process.

Keywords : Copper; electronics industry; climatic factors; corrosion; air pollutants.

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