Control method for forced current cathodic protection of storage tank

Abstract

The invention discloses a control method for forced current cathodic protection of a storage tank. The control method comprises the following steps of initial detection, equipment operation, data acquisition, data process, standard reaching comparison, target comparison, over-protection adjustment and calculation, under-protection adjustment and calculation, positive adjustment and calculation, negative adjustment and calculation and output adjustment. According to the control method, the potential measured by a reference electrode when a potentiostat is powered off is the power-off potential, so that the problem that the power-off potential cannot be detected due to the fact that a polarization test piece or a polarization probe cannot be set is solved; and the output of the potentiostat is adjusted by taking the power-off potential as a control basis, the requirements of industry standards can be met, and the cathodic protection effect can be accurately achieved.

Description

technical field [0001] The invention belongs to the technical field of cathodic protection and anticorrosion, and in particular relates to a control method for forced current cathodic protection of a storage tank. Background technique [0002] The outer side of the tank bottom plate is in direct contact with the asphalt sand, but when the outer edge plate of the tank bottom is tilted, a large gap will be formed between the edge plate and the base. Due to the undulating deformation of the tank bottom plate, a There are many channels and spaces, so that rainwater can enter the center of the tank bottom plate, and the entry of rainwater will cause oxygen concentration corrosion, resulting in corrosion of the tank bottom plate. In order to solve this problem, waterproof measures have been taken on the outer edge of the bottom plate of the storage tank, but it is still difficult to solve the problem of corrosion on the bottom plate of the tank. [0003] Cathodic protection is an...

AI Technical Summary

Problems solved by technology

However, in this operation mode, when there is stray current in the environment, the IR will change greatly, and the potentiostat cannot automatically identify the interference, and the output may be abnormal and the phenomenon of automatic shutdown may occur.

Moreover, the power-on potential is used as the control index, which is inconsistent with the power-off potential required in the industry standard, and the cathodic protection effect cannot be accurately achieved.

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