由线性极化方程式R_p=B/I_(eorr)看出,当常数B相同时,即可用极化电阻R_p来比较腐蚀速度I_(eorr)的相对大小。这就是用极化电阻来评价土壤腐蚀性的依据。钢铁在土壤中的腐蚀快慢不仅与土壤类型有关,而且更重要的是与土壤的物理性质,如含水量、孔隙度、结构、质地等有关。这些决定土壤通气性的物理性质是影响土壤中钢铁腐蚀过程的主导因素。同 It can be seen from the linear polarization equation R_p = B / I_ (eorr) that when the constant B is the same, the relative size of the corrosion rate I eorr can be compared with the polarization resistance R_p. This is the basis for the use of polarization resistance to evaluate soil corrosion. The corrosion rate of steel in soil is not only related to soil type, but more importantly, it is related to the physical properties of soil, such as water content, porosity, structure, texture and so on. These determine the physical properties of soil aeration is the dominant factor affecting the corrosion process of steel in the soil. with