PROCEDURE MEASURING POLARIZATION POTENTIAL OF METAL UNDERGROUND STRUCTURE Russian patent published in 2003 - IPC

FIELD: test of protection of material of current- conducting structure against electrochemical corrosion, specifically, of underground steel pipe-lines. SUBSTANCE: procedure includes action of periodic pulse current on metal underground structure, measurement of potentials U₁ and U₂ of structure and of potential gradients ΔU₁ and ΔU₂ in ground correspondingly before and after action of pulse current. Values of polarization potential is calculated by formula U_p = U₂-ΔU₂•(U₂-U₁)/ΔU₂-ΔU₁. EFFECT: diminished error of measurement of polarization potential, enhanced convenience and simplicity of operation in the field over entire extent of metal underground structure. 1 dwg