Apparatus and method for measuring welding tube corrosion under stress condition

Abstract

A device for testing corrosion of welded pipe under stress state and a testing method for the same belong to the field of testing and analyzing a material by the means of testing the chemical or physical property of the material. In the device, a partition board is arranged in the middle of an electrolytic cell to divide the electrolytic cell into an electrolytic cell part and an electrode arrangement chamber; a trough circular hole, the edge of which is embedded with a rubber sealing ring, is arranged on the partition board; a bracket is arranged at one side of the electrode arrangement chamber; the bracket is provided with a stress ring, the two ends of which are provided with nuts; the two ends of a work electrode are connected with the stress ring through screw thread and are fixed within the stress ring under the loading state; the lateral of the electrode arrangement chamber is provided with a holding down bolt; and the loaded electrode is tightly pressed against the circular hole embedded with the rubber sealing ring. The invention also discloses a method for testing corrosion of welded pipe under stress state. The invention can be applied to the electrochemistry testing field for testing erosion, corrosion, or anti-corrosion performances of the electrodes with complex shapes and different stress loadings due to different heat treatment conditions.

Description

technical field [0001] The present invention relates to the field of testing or analyzing materials by means of determining their chemical or physical properties, in particular to the field of an electrochemical measurement system for testing atmospheric erosion, corrosion or anticorrosion measurements. Background technique [0002] At present, the electrochemical method is used to measure the corrosion resistance of the weld seam of the longitudinal seam welded pipe. The electrochemical method generally adopts an electrolytic cell of a three-electrode system, and the weld seam and the base metal are processed into working electrodes, and the anode overpotential 50mV of the constant potential method is used to corrode for 144 hours, and the groove corrosion sensitivity coefficient of the weld seam is measured, with This is used to indicate the corrosion resistance of the weld. [0003] On the other hand, many welded pipe products, such as J55 welded pipe, K55 welded pipe, e...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a device for measuring welded pipe corrosion under stress state, which can continuously measure the groove corrosion sensitivity of welded pipe products under actual use conditions under constant electrolyte solution for a long time , which solves the non-corrosion surface sealing problem caused by the complex shape of the working electrode, and can truly measure the influence of different stresses caused by different heat treatment conditions on the groove corrosion performance of welded pipes

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