Corrosion testing device for metal inside gaps under stripped coatings

Abstract

The invention relates to a corrosion testing device for metal inside gaps under stripped coatings. The corrosion testing device comprises a bottom board and a cover board which is placed on the bottom board and is fixed with the bottom board, wherein a gap is formed between the cover board and the bottom board, a solution area is located on one side of the cover board and is communicated with the gap, and salt bridges are arranged on the other side of the cover board at equal intervals and used for being connected with outside reference electrodes. An auxiliary electrode and a composite micro electrode are respectively installed on corresponding positions one two sides of each salt bridge, one ends of each auxiliary electrode and each composite micro electrode are both communicated with solution inside the gap, and the other ends of each auxiliary electrode and each composite micro electrode are respectively connected with a measurement meter through copper conducting wires. More than two small sample placing areas are installed on the bottom board, and the positions of the small sample placing areas correspond to the auxiliary electrodes one to one. By means of the corrosion testing device, different gap depth electrochemical measurement of the metal in gaps can be conducted, and simultaneously changes of microenvironments in gaps can be monitored in real time. Besides, the corrosion testing device has the advantages of small size, simple structure, convenient operation, high measurement accuracy, and the like.

Description

technical field [0001] The invention relates to a metal corrosion test device, in particular to a metal corrosion test device in a gap under a stripping coating. Background technique [0002] Generally, the anticorrosion coating of buried pipelines is not perfect in isolating corrosive media. Due to the defects of the coating material itself (pinholes, leaks, etc.) and the pipeline transportation, loading and unloading and construction process, the coating will be mechanically damaged, and the surrounding soil environment after the pipeline is buried (such as: soil stress, cathodic hydrogen evolution, etc.) Factors), third-party damage, etc. will lead to the formation and expansion of coating defects. The above results will cause the anti-corrosion coating to lose its cohesive force and peel off, forming a gap between the pipeline surface and the coating. ) penetrates into the crevice, a local corrosion microenvironment will be formed, which will lead to corrosion of the p...

AI Technical Summary

Problems solved by technology

The above results will cause the anti-corrosion coating to lose its cohesive force and peel off, forming a gap between the pipeline surface and the coating. ) penetrates into the crevice, a local corrosion microenvironment will be formed, which will lead to corrosion of the pipeline in the crevice under the stripped coating

Images