tailieunhanh - Scientific, Health and Social Aspects of the Food Industry Part 6

Tham khảo tài liệu 'scientific, health and social aspects of the food industry part 6', khoa học tự nhiên, công nghệ sinh học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Micro and Nano Corrosion in Steel Cans Used in the Seafood Industry 139 Fig. 6. Filiform corrosion formed in internal of tin plate steel cans Fig. 7. Microbiological corrosion in internal of steel cans with plastic coatings. 140 Scientific Health and Social Aspects of the Food Industry Fig. 8. Microbiological corrosion in internal of steel cans with tin coatings. 1. Endogenous. Originally present in the food before collection including food animal which produces the zoonoses diseases transmitted from animals to humans in various ways including through the digestive tract through food. 2. Exogenous. Do not exist in the food at the time of collection at least in their internal structures but came from the environment during production transportation storage industrialization. Fungi are uni-or multicellular eukaryotic type their most characteristic form is a mycelium or thallus and hyphae that are like branches. AES examination AES analyses were carried out to determine the corrosion products formed in indoor and outdoor of the steel cans. Figure 9a show scanning electron micrograph SEM images of areas selected for AES analysis covered by the principal corrosion products which are rich in chlorides and sulfides in tin plate steel cans evaluated. The Auger map process was performed to analyze punctual zones indicating the presence of Cl- and S2- as the main corrosive ions present in the steel corrosion products. The Auger spectra of steel cans was generated using a 5keV electron beam Clark et al 2006 which shows an analysis of the chemical composition of thin films formed in the steel surface Figure 9b . The AES spectra of steel cans in the seafood plants show the surface analysis of two points evaluated in different zones of the steel probes. The peaks of steel appear between 700 and 705 eV finding the chlorides and sulfides. In figure 10 the spectra reveals the same process as in figure 9 wit plastic coatings with variable concentration in the chemical .