The Experimental Study on the Soil Corrrosion of Beijing Underground Gas Pipeline

The corrosion property of carbon steel has been investigated by the buried coupons along the natural gas pipeline in Beijing. The corrosion products has been analyzed by x-reaction. The corrosion morphology of the bare steel coupons can be-divided into the general corrosion and localized corrosion including ulcer spotting and round hole. Except for inclusion in material, the corrosion behavior is related to the physical-chemical property and the structure of soil. The soil is a complicated medium for its polyphase, porous, in-homogeneous and the complex of inter relationship among parameters, so the corrosion property of the carbon steel coupons is the result of cooperating action of many parameters.