TAILIEUCHUNG - Indoor and Outdoor Air Pollution Part 9

Tham khảo tài liệu 'indoor and outdoor air pollution part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Spectroscopy Analysis of Corrosion in the Electronic Industry Influenced by Santa Ana Winds in Marine Environments of Mexico 71 more dark sections without chloride ions compared with the evaluation in Ensenada. Auger spectra indicate the air pollutants combined with CO2 of the environment Figure 5b . Table 4 represents the atomic concentration of metallic probes with the percentages of air pollutants and carbon and oxygen Sankara et al 2007 Clark 2006 . 1 3 2 UJ UJ s Cl Point c Cu s Cl Point 2 c Cu a b Fig. 4. Analysis of corrosion products of copper at one year of exposition a Auger map and b AES in Ensenada 2010 . a b Fig. 5. Analysis of corrosion products of copper at one year of exposition a Auger map and b AES in Tijuana 2010 . 72 Indoor and Outdoor Air Pollution Figures 6 and 7 show the Auger spectra at 1 3 and 6 months of metallic coupons after the cleaning process with Ar ions at 5 minutes. SEM and AES analyses were carried out to determine the corrosion products formed in the copper surface. Figures 6 and 7show the scanning electron micrograph SEM images of areas selected for AES analysis covered by the principal corrosion products which are rich in the both air pollutants mentioned above in both cities as the test results indicate. The Auger map process was performed to analyze punctual zones indicating the presence of Cl- and S as the main corrosive ions present in the copper corrosion products. The Auger spectra of Cu specimens was generated using a 5keV electron beam which shows an analysis the chemical composition of the thin films formed in the Cu surface in Ensenada Fig 2 and in Tijuana Fig 3 . The AES spectra of copper specimens installed in industrial plants in both cities show the surface analysis of three points evaluated in different zones of the metallic probes. The peaks of Cu appear between 905 and 915 eV finding the chlorides and sulphides. In figure 6 the spectra reveals the presence of carbon and oxygen chlorides and sulphides with .

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