An experimental method and device for dynamically simulating under-deposit corrosion

Abstract

The invention belongs to the technical field of material corrosion and protection experiments and relates to an experiment method for dynamically simulating under-deposit corrosion and an experiment device of the experiment method. The experiment method provided by the invention can simulate couple effects between two test pieces, can realize corrosion weight loss measurement and surface morphological observation, and is suitable for an under-deposit corrosion dynamic simulation experiment research. The experiment device comprises a main body annular clamp and a sector-shaped auxiliary test piece, wherein the central position of the main body annular clamp has a circular hollow hole and a corresponding notch; the main body annular clamp is fixedly connected with an externally-connected driving shaft by the notch; a groove is formed in the bottom of the main body annular clamp; an electric lead wire is arranged in the groove to be connected with the two experiment test pieces; physical isolation between each two experiment test pieces is realized by the sector-shaped auxiliary test piece; the thickness of the auxiliary test piece can be adjusted so that the thickness difference between the auxiliary test piece and the experiment test piece is equal to the scale layer thickness required by the experiment. The experiment method has the advantages of reliability, high credibility, simple device structure, and convenience and practicability.

Description

technical field [0001] The invention belongs to the technical field of material corrosion and protection experiments, and relates to an experimental method and a device for dynamically simulating under-deposit corrosion. It is mainly suitable for evaluating the corrosion status of metal pipes under different sand and scale deposition conditions, especially for the simulation of the galvanic effect caused by uneven sand and scale on the surface of metal materials, and the evaluation of the effect of corrosion inhibitors after adding corrosion inhibitors. Background technique [0002] Metal materials often have chemical and electrochemical interactions with the surrounding environment during service, causing corrosion risks. The special environment of oil and gas pipelines will produce CO 2 、H 2 Corrosive gases such as S, accompanied by microbial sand and scale deposition, form under-deposit corrosion in a complex medium environment, resulting in leakage and failure of oil an...

AI Technical Summary

Problems solved by technology

At present, there is no such experimental method and device that can perform dynamic high temperature and high pressure simulation. A sub-deposit corrosion experiment bracket and its experimental method (application number: ZL201210144586.X) mainly focus on electrochemical corrosion under sub-deposit corrosion conditions. The test cannot realize the galvanic couple effect caused by the different scale thickness and the dynamic simulation under high temperature and high pressure

Images