研究了不同湿度,不同接菌条件的同一土壤对钢的腐蚀作用。其结果是随着土壤湿度从6.5％上升到25％,土壤电阻,氧化还原电位,好气菌量递减,硫酸盐还原菌递增。钢的腐蚀失重随湿度提高而下降,接近饱和点(22％)后腐蚀率变化很小,腐蚀率变化临界点在湿度为18～20％之间。蚀坑深度在湿度为12～15％时最大,低于10％时次之,超过20％时最低。湿度在6.5～20％下是局部腐蚀,超过20％为均匀腐蚀。低湿度(6.5～16％)下,菌生长旺盛的比加杀菌剂抑制菌生长的土壤中,钢腐蚀失重高40～123％。文中对不同湿度土壤中钢的腐蚀原因进行了讨论。
The corrosion behavior of mild steel in soil with various moisture and microbial condition has been investigated. The results showed that with increase in soil moisture from 6.5 to 25%, the weight loss of the steel due to corrosion as well as the soil resistivity, redox potential and count of aerobic bacteria decreased, while the count of sulfate-reducing bacteria markedly increased. When the moisture was near the saturation point, there was little change of corrosion rate, and the "critical soil moisture" for corrosion was at 18～20%. The maximum pit depths occured between 12% and 15% moisture, and the minimum at over 20%. At moisture content of 6.5～20%, corrosion was mostly localized, but over 20% general corrosion predominated, The weight loss of steel in soil with intensive activity of microbes was 40～123% higher than that in microbes inhibited soil at low moisture levels. The causes for steel corrosion under various soil moisture have been discussed.
参考文献
| [1] | Romanoff, M., National Bureau of Standards circular, 579(1957) |
| [2] | Starkey, R. L., et al., Final Report of the Am. Gas Assoc. Iron Corrosion, Research Fellowship, 3～108(1945) |
| [3] | Kulman, F. E., Corrosion. 9,11～18(1953) |
| [4] | Booth, G. H., et al., Br. corros. J., 2, 104～118(1967) |
| [5] | Tomashov, N. D., et al., Corrosion, 15, 41～46(1959) |
| [6] | Smith, C. A., Anti-Corrosion, 28, 4～8 (1981) |
| [7] | Stratfull, R. F., Corrosion, 17, 115～118(1961) |
| [8] | Schwerdtfeger. W. J., J. Research of the National Bureau of Standards, 69, 71～77 (1964) |
| [9] | Mukherjee, K. P., Chemical Age of India, 30, 7A, 639～642(1979) |
| [10] | Award, G. H., Br. corros. J., 15, 140～145(1980) |
| [11] | #12 |
| [12] | Markovic, T., Werkstoffe und Korrosiono 5, 244～246(1954) |
| [13] | Markovic, T., ibid, 6, 334～337(1955) |
| [14] | Gupta, S. K., et al., Corrosion Science, 19, 171～178(1979) |
| [15] | 吕人豪等,微生物学报 13,77～80(1973) |
| [16] | van Wolzogen Kuhr, C. A. H., et al., Water, 18, 147～165 (1934) |
| [17] | Harris, J. O., Corrosion, 20, 335t～340t(1964) |
| [18] | #12 |
| [19] | Deuber, C. G., Corrosion, 9, 95～96(1953) |
| [20] | Minchin, L. T., Coke und Gas 18, 495～497, 504(1956) |
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