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AC 43.13-1B CHG 1 9/27/01 is not present. The metabolism of these bacte ria requires them to obtain part of their suste nance by oxidizing inorganic compounds, such as iron, sulfur, hydrogen, and carbon monox ide. The resultant chemical reactions cause corrosion. b. Fungi are the growths of micro organisms that feed on organic materials. While low humidity does not kill microbes, it slows their growth and may prevent corrosion damage. Ideal growth conditions for most mi cro-organisms are temperatures between 68 and 104 °F (20 and 40 °C) and relative hu midity between 85 and 100 percent. c. Damage resulting from microbial growth can occur when any of three basic mechanisms, or a combination of these, is brought into play. First, fungi have a tendency to hold moisture, which contributes to other forms of corrosion. Second, because fungi are living organisms, they need food to survive. This food is obtained from the material on which the fungi are growing. Third, these mi cro-organisms secrete corrosive fluids that at tack many materials, including some that are not fungi nutrient. d. Microbial growth must be removed completely to avoid corrosion. Microbial growth should be removed by hand with a firm non-metallic bristle brush and water. Removal of microbial growth is easier if the growth is kept wet with water. Microbial growth may also be removed with steam at 100 psi. Pro tective clothing must be used when using steam for removing microbial growth. 6-5.6-10. [RESERVED.] Page 6-4 Par 6-4PDF Image | AFS-640
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