关键词: 土壤腐蚀, 现场试验, 数学模型, 模式识别

Abstract: The whole process of study on soil corrosion models in Dagang oilfield is demonstrated in the present paper.Within an area of 3500km²,about 20 disposal sites for soil corrosion test have been designed by a computer-based cluster analysis method.Then,after one-year in-situ corrosion test,both the average corrosion weightlessness and the maximum pitting corrosion depth of A3 steel standard coupons at each site have also been measured as the indexes of soil corrosivity.These indexes,together with soil physical-chemical properties,are treated by pattern recognition and factor analysis to determine the key parameters of soil corrosivity.Finally,four kinds of corrosion models have been established to evaluate the soil corrosivity quantitatively.As the results of an application,the soil corrosivity of the whole area is predicted to give a form of soil,corrosion map,as well as the mechanism of underground corrosion in Dagang oilfield is recognized.

Key words: soil corrosion, in-situ test, mathematical model, pattern recognition