Under-deposit corrosion experiment bracket and method for experimenting by using same

Abstract

The invention relates to an under-deposit corrosion experiment bracket and a method for experimenting by using the same, relating to the technical field of corrosion testing. The under-deposit corrosion experiment bracket comprises a bracket panel and a bracket base, wherein outer edges of the bracket panel and the bracket base are provided with fixing holes which are opposite in position, the bracket panel and the bracket base are connected and fixed through fixing members arranged in the fixing holes, the bracket panel is provided with a working electrode hole the diameter of which is equal to that of a working electrode, a panel groove is arranged around the working electrode hole and is internally provided with an O-shaped panel ring, a base groove is arranged in the bracket base, an O-shaped base ring is arranged in the base groove, three electric contacts are arranged on positions on the bracket base, which are positioned in the circumference of the inner diameter of the O-shaped base ring; lower ends of the electric contacts are inserted to the tops of electric contact supports; and a lead groove is arranged in the bracket base, and electric leads are arranged on the electric contact supports. The method can be used for carrying out electrochemical corrosion testing, corrosion weight loss measurement and surface appearance observation on the same corrosion test coupon, and is suitable for simulation study on electrochemical corrosion and under-deposit corrosion.

Description

technical field [0001] The invention belongs to the technical field of corrosion experiments, and in particular relates to an under-scaling corrosion experiment bracket capable of adjusting the thickness of a dirt layer and an experiment method thereof. Background technique [0002] The most common form of corrosion failure in oil and gas pipelines is CO 2 Corrosion and H 2 S corrosion, the corrosion products of these corrosions may be associated with sand, elemental sulfur and CaCO in oil and gas transport media 3 , BaSO 4 The scale layer is deposited on the inner surface of the pipeline together, causing under-deposit corrosion. This type of corrosion has the characteristics of both under-deposit corrosion and electrochemical corrosion. Because of the thickness of the scale layer, the corrosion behavior of the metal surface is also different. In these places where the scale is deposited, it is difficult for the corrosion inhibitor to penetrate the scale layer to protec...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an under-deposit corrosion experiment bracket and its experimental method, which only needs one working electrode, and can realize electrochemical corrosion test, corrosion weight loss measurement and surface morphology observation on the same corrosion test piece , which solves the problem of poor reliability of the research results caused by the traditional electrochemical corrosion experiment method that needs to combine different working electrodes to complete the electrochemical corrosion research; it realizes the scale layer placed on the working electrode, and the thickness of the scale layer can be adjusted , can be used for metal corrosion behavior and corrosion inhibitor performance evaluation research under different scale thicknesses; it is suitable for electrochemical corrosion and under-deposit corrosion simulation research, such as CO 2 and H 2 S corrosion, corrosion of metals at deposits of sand, elemental sulfur and scale, and performance evaluation of corrosion inhibitors, etc.

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