微生物によるアルミニウム合金の腐食に関する研究
1966 年 16 巻 3 号 p. 147-156
詳細
1966 年 16 巻 3 号 p. 147-156
In Japan Air Self-Defense Force, serious corrosion problems were encountered, regarding to the presence of the microorganisms in JP-4 fuel. Fuel was dripping from a tank in jet fuel aircraft. Microorganisms were cultured after being isolated from the JP-4 fuel underground storage tank, tank-lorry, water separator, and aircraft fuel tank. The effects of microbiological corrosion were examined on the specimens of 61-S aluminum alloy which was used in aircraft fuel tanks.
The results were as follows:
(1) Seventeen sorts of bacteria and three sorts of fungi were found to be bred by the utilization of JP-4 as nutritious element.
(2) After culturing for 140 days, the surfaces of some aluminum specimens were covered with brown powdery blisters caused by the growth of microorganisms and other contaminations.
(3) Severe corrosion pits were made on aluminum specimens, on which Micrococcus caseolyticus, Comamonas, and Vibrio faecalis were cultured.
(4) It was observed that the surface of aluminum alloy specimens was covered with mycelium mats of Cladosporium resinae and tremendous corrosion existed under the mats.
As the results, it is concluded that the preparation of filter-separator equipment such as ultrafine filter will be effective for the purpose of perfect removal of microorganisms from aircraft fuel.
