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

A technology of corrosion under scale and experimental method, applied in the field of corrosion experiment, can solve problems such as poor reliability, and achieve the effects of reasonable steps, simple device structure and reliable experimental method.

Active Publication Date: 2014-08-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of support for under-deposit corrosion experiments, comprising a support panel 1 and a support base 2; the outer edges of the support panel 1 and the support base 2 are provided with corresponding fixing holes 12, and the support panel 1 and the support base 2 pass through The fixing parts arranged in the fixing holes 12 are connected and fixed; the bracket panel 1 is provided with a working electrode hole 3 having the same diameter as the working electrode, and a panel groove is arranged around the working electrode hole 3, and the panel concave An embedded panel O-ring 4 for sealing the working electrode is provided in the groove; a base groove is provided on the support base 2, and an inner seal for sealing the support panel 1 and the support base 2 is provided in the base groove. Embedding base O-ring 5; the bracket base 2 is provided with three electrical contacts 6 at positions within the inner diameter circumference of the base O-ring 5, and the lower end o...

Embodiment 2

[0027] A support for under-deposit corrosion experiments is the same as that in Example 1, except that the support panel 1 and the support base 2 are circular, and the number of fixing holes 12 corresponding to the positions provided at the outer edges is four.

[0028] The experimental method of the under-deposit corrosion experiment bracket is the same as in Example 1, except that before the experiment, when the bracket is assembled, the screw 10 is passed through the fixing holes 12 of the bracket base 2 and more than two bracket panels 1, Then tighten the nut 11, and finally add a scale layer to the thickness of the scale layer required by the experiment in the working electrode hole 3 on the working electrode.

Embodiment 3

[0030] A support for under-deposit corrosion experiments is the same as that in Example 1, except that the support panel 1 and the support base 2 are square, and the number of fixing holes 12 corresponding to the positions provided at the outer edges is four.

[0031] In this way, during the experiment, a kind of under-deposit corrosion experiment bracket and its experimental method of the present invention can realize electrochemical corrosion test, corrosion weight loss measurement and surface morphology observation on the same corrosion test piece, which is suitable for electrochemical corrosion and under-deposit corrosion. Corrosion simulation studies, such as CO of oil and gas system equipment 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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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00G01N17/02
Inventor 蒋秀屈定荣刘小辉
Owner CHINA PETROLEUM & CHEM CORP
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