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地下金属管道在滨海盐土、盐化潮土及黄潮土等弱度淋溶型土壤中腐蚀严重,10年内即可出现多处穿孔,最大孔蚀速率可达1.5毫米/年。穿孔多少主要与土壤的电阻率、含盐量和含氯量有关,其中氯离子含量的影响最大。在砂姜土、棕壤、黄垆土、褐土、栗钙土等中度淋溶型土壤中腐蚀较轻,一般10年内不会出现穿孔。强度淋溶的鳝血水稻土、红壤性、赤红壤性水稻土及赤红壤腐蚀最轻,最大孔蚀速率<0.01毫米/年。处于嫌气状态的南方沼泽性水稻土地区,由于出现微生物腐蚀,最大孔蚀速率可达0.5毫米/年。
Underground metal pipes are seriously corroded in weakly leaching soils, such as coastal saline soil, salty soil and yellow soil, and multiple perforations can occur in 10 years. The maximum pitting rate can reach 1.5 mm / year. The number of perforation is mainly related to the resistivity of soil, salt content and chlorine content, of which the chloride ion content has the greatest impact. Corrosion in sand soil, brown soil, yellow soil, cinnamon soil, chestnut soil moderately leaching soil less corrosion, generally do not appear perforation within 10 years. Intensive leaching eel blood paddy soil, red soil, red soil and red soil erosion of the lightest, the largest pitting corrosion rate <0.01 mm / year. In the area of southern marsh paddy soil under anaerobic state, due to microbial corrosion, the maximum pitting rate can reach 0.5 mm / year.