CN103884639A - Experiment method for dynamically simulating under-deposit corrosion and experiment device of experiment method - Google Patents
Experiment method for dynamically simulating under-deposit corrosion and experiment device of experiment method Download PDFInfo
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- CN103884639A CN103884639A CN201410140949.1A CN201410140949A CN103884639A CN 103884639 A CN103884639 A CN 103884639A CN 201410140949 A CN201410140949 A CN 201410140949A CN 103884639 A CN103884639 A CN 103884639A
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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
The invention belongs to material corrosion and prevention technical field, relate to a kind of experimental technique and device thereof of dynamic similation underdeposit corrosion.Mainly be applicable to evaluate the corrosion condition of metal pipe material under different sand scale deposition situations, especially to because sand scale is in the simulation of the inhomogeneous galvanic effect causing of metal material surface, and add the evaluation to corrosion inhibiter action effect after corrosion inhibiter.
Background technology
Metal material Chang Huiyu environment generation chemistry and electrochemical action around in process under arms, causes corrosion risk, and wherein the particular surroundings of pipe-line can produce CO
2, H
2the corrosive gass such as S, and be attended by the sand scale deposition of microorganism, form the underdeposit corrosion under complex dielectrics environment, cause pipe-line leakage failure.
And this class underdeposit corrosion often has the feature of galvanic corrosion concurrently, become dirty metal surface and do not become dirty metal surface potential difference (PD) difference to cause galvanic effect, dirty layer thickness different metal surface corrosion behavior is also different.Due to the effect such as isolation, absorption of sand scale, corrosion inhibiter can not play a very good protection to the matrix of part under dirt sometimes, and when dirty layer the two coexists with corrosion inhibiter, the corrosion behavior of metal surface becomes more complicated.Traditional simulation underdeposit corrosion is take electrochemistry experiment method as main, and may occur the inconsistent situation of control to dirt layer quality on working electrode, thereby causes the repeatability of result of study poor with a low credibility.This experimental technique and device are invented design for laboratory dynamic similation underdeposit corrosion situation, and this device can be placed in to High Temperature High Pressure dynamic response still, simulate different environmental parameters.At present, also there is no this experimental technique and the device that can carry out dynamic high temperature high pressure simulation, what underdeposit corrosion stand for experiment and experimental technique (application number: ZL201210144586.X) thereof were mainly paid close attention to is the galvanic corrosion test under underdeposit corrosion condition, can not realize the dynamic similation under galvanic effect and the High Temperature High Pressure causing because of dirty layer thickness difference.
Summary of the invention
The object of the present invention is to provide a kind of experimental technique and device thereof of dynamic similation underdeposit corrosion, mainly for the corrosion condition of metal pipe material under different sand scale deposition situations, especially to because sand scale is in the simulation of the inhomogeneous galvanic effect causing of metal material surface, and add the evaluation to corrosion inhibiter action effect after corrosion inhibiter.
The experimental provision of a kind of dynamic similation underdeposit corrosion of the present invention, comprises main ring clamp and fan-shaped auxiliary test piece.Main ring clamp is faced cross section and is double concave, and center is provided with circular hollow hole and 2 corresponding gap, being connected and fixed between realization body annular holder and external driving shaft, the size in circular hollow hole and the consistent size of external driving shaft; Main ring clamp bottom is provided with groove, and electrical lead is placed in groove and can realizes two electrical connections between fan-shaped experiment test piece, and groove size is consistent with experiment electricity consumption conductor size.
Between two fan-shaped experiment test pieces, by fan-shaped auxiliary test piece physical isolation, position, space adopts 704 silicone rubber seals, makes the workplace contact corrosion medium of fan-shaped experiment test piece and all the other positions and the Korrosionsmedium isolation of fan-shaped experiment test piece.Fan-shaped auxiliary test piece can be carried out thickness adjustment according to requirement of experiment, makes that fan-shaped experiment test piece and fan-shaped auxiliary thickness of test piece are poor equals dirty layer thickness.
Main ring clamp of the present invention and fan-shaped auxiliary test piece all adopt teflon corrosion-resistant material to make.
The experimental provision experimental technique used of a kind of dynamic similation underdeposit corrosion of the present invention, comprise the following steps: before experiment, 4 fan-shaped experiment test pieces after workplace polishing are placed in main ring clamp, workplace is exposed to, fan-shaped auxiliary test piece is added in all the other positions, position, space 704 silicone rubber seals, leave standstill the test piece of sealing within 12 hours, to treat above silica dehydrator at dry places; 1 electrical lead is placed in groove, its exposed section, two ends is connected with 2 fan-shaped experiment test piece bottoms, and uses conductive tape fixing seal, simulation is because sand scale is at the inhomogeneous galvanic effect causing of metal material surface.In experiment, place as required the dirt layer of different-thickness on fan-shaped experiment test piece surface; For guaranteeing that the sand scale on fan-shaped experiment test piece surface can deposit well, first leave standstill 2 days, then start High Temperature High Pressure dynamic experiment.After experiment finishes, utilize fan-shaped experiment test piece to carry out corrosion weight loss measurement and surface topography observation.
The present invention has the following advantages: be applicable to underdeposit corrosion experimental study, as the CO of pipe-line
2burn into H
2s burn into sand and dirt layer lodgment corrosion of metal and corrosion inhibiter performance evaluation etc., especially can carry out the simulation for the galvanic effect causing because of sand scale skewness, and can regulate the thickness of dirt layer; This apparatus structure is simple, and experimental technique is reliable, and step is reasonable, repeatable high, workable.
Accompanying drawing explanation
Fig. 1 is the vertical view of dynamic similation underdeposit corrosion experimental provision main ring clamp;
Fig. 2 is the sectional view of dynamic similation underdeposit corrosion experimental provision main ring clamp;
Fig. 3 is the vertical view of the auxiliary test piece/experiment test piece of dynamic similation underdeposit corrosion experimental provision;
Wherein: 1, main ring clamp; 2, fan-shaped auxiliary test piece; 3, circular hollow hole; 4, gap; 5, groove.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.
For the environmental parameter of certain submarine transport oil pipeline, design two groups of experiments, one group of one group of static state is dynamic.Dynamic experiment test piece used is the sand scale deposition sample making through special system dirt experiment, still can maintain at simulation flow velocity take the sand that guarantees deposition under 0.5m/s condition.In every group of experiment, have four test pieces, wherein a surface is without sand, and a surface is all covered by sand; Other two test pieces bottom is connected with copper conductor, simulation galvanic effect, these two be also a surface without sand, a surface is all covered by sand.Experimental temperature is 80 ℃, CO
2dividing potential drop is 0.8MPa, and experimental solutions is this oil field extracted water simulation solution.
Experimental provision adopts the experimental provision of dynamic similation underdeposit corrosion, as shown in Figure 1 and Figure 2, mainly comprises main ring clamp 1 and fan-shaped auxiliary test piece 2; Main ring clamp 1 is faced cross section and is double concave, and center is provided with circular hollow hole 3 and two corresponding gap 4, being connected and fixed between realization body annular holder 1 and external driving shaft, the size in circular hollow hole 3 and the consistent size of external driving shaft; Main ring clamp 1 bottom is provided with groove 5, electrical lead is placed in to groove 5 is interior realizes two electrical connections between fan-shaped experiment test piece; Between two fan-shaped experiment test pieces by fan-shaped auxiliary test piece 2 physical isolation.
Before experiment, the workplace of fan-shaped test piece is polished to 800# step by step with sand paper, then by 4 fan-shaped experiment test pieces with fan-shaped auxiliary test piece 2 is spaced apart puts in main ring clamp 1, wherein two fan-shaped auxiliary test piece 2 bottoms are electrically connected with copper conductor, interface is fixed with conductive tape, gap position 704 silicone rubber seals, as shown in Figure 3.The test piece of sealing is left standstill to 12 hours in dry place.In experiment, place as required the dirt layer of different-thickness on fan-shaped experiment test piece surface; For guaranteeing that the sand scale on fan-shaped experiment test piece surface can deposit well, first leave standstill 2 days, then start High Temperature High Pressure dynamic experiment.After experiment finishes, utilize experiment test piece to carry out corrosion weight loss measurement and surface topography observation.
Claims (8)
1. an experimental provision for dynamic similation underdeposit corrosion, is characterized in that: comprise main ring clamp (1) and fan-shaped auxiliary test piece (2); Described main ring clamp (1) is faced cross section and is double concave, center is provided with circular hollow hole (3) and two corresponding gap (4), being connected and fixed between realization body annular holder (1) and external driving shaft, the size of circular hollow hole (3) and the consistent size of external driving shaft; Described main ring clamp (1) bottom is provided with groove (5), and electrical lead is placed in and in groove (5), realizes two electrical connections between fan-shaped experiment test piece.
2. the experimental provision of a kind of dynamic similation underdeposit corrosion according to claim 1, is characterized in that: groove (5) size of described main ring clamp (1) bottom is consistent with experiment electricity consumption conductor size.
3. the experimental provision of a kind of dynamic similation underdeposit corrosion according to claim 1, it is characterized in that: between two fan-shaped experiment test pieces by fan-shaped auxiliary test piece (2) physical isolation, position, space adopts 704 silicone rubber seals, makes the workplace contact corrosion medium of fan-shaped experiment test piece and all the other positions and the Korrosionsmedium isolation of fan-shaped experiment test piece.
4. the experimental provision of a kind of dynamic similation underdeposit corrosion according to claim 1, it is characterized in that: described fan-shaped auxiliary test piece (2) can be carried out thickness adjustment according to requirement of experiment, make fan-shaped experiment test piece and fan-shaped auxiliary test piece (2) thickness difference equal dirty layer thickness.
5. the experimental provision of a kind of dynamic similation underdeposit corrosion according to claim 1, is characterized in that: described main ring clamp (1) and fan-shaped auxiliary test piece (2) adopt teflon corrosion-resistant material to make.
6. the experimental technique adopting according to the experimental provision of a kind of dynamic similation underdeposit corrosion described in claim 1 to 5, it is characterized in that: before experiment, 4 fan-shaped experiment test pieces after workplace polishing are placed in main ring clamp (1), workplace is exposed to, fan-shaped auxiliary test piece (2) is added in all the other positions, position, space 704 silicone rubber seals, leave standstill the test piece of sealing within 12 hours, to treat above silica dehydrator at dry places; 1 electrical lead is placed in groove (5), its exposed section, two ends is connected with 2 fan-shaped experiment test piece bottoms, and uses conductive tape fixing seal, simulation is because sand scale is at the inhomogeneous galvanic effect causing of metal material surface.
7. the experimental provision of a kind of dynamic similation underdeposit corrosion according to claim 6 and experimental technique thereof, is characterized in that: in experiment, place as required the dirt layer of different-thickness on fan-shaped experiment test piece surface; For guaranteeing that the sand scale on fan-shaped experiment test piece surface can deposit well, first leave standstill 2 days, then start High Temperature High Pressure dynamic experiment.
8. the experimental provision of a kind of dynamic similation underdeposit corrosion according to claim 6 and experimental technique thereof, is characterized in that: after experiment finishes, utilize fan-shaped experiment test piece to carry out corrosion weight loss measurement and surface topography observation.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203449A (en) * | 2015-10-13 | 2015-12-30 | 东南大学 | Corrosion tank for reinforcing bar corrosion testing in simulated concrete pore solution |
| CN105699285A (en) * | 2014-11-28 | 2016-06-22 | 中国石油天然气股份有限公司 | Electrochemical device for corrosion test under elemental sulfur scale |
| CN107192660A (en) * | 2017-05-27 | 2017-09-22 | 中国科学院上海技术物理研究所 | It is a kind of to be used for the apparatus and method that dynamic observes Cdl-x_Znx_Te chemical attack hole |
| CN111982799A (en) * | 2020-08-24 | 2020-11-24 | 中国人民解放军海军航空大学青岛校区 | Atmospheric corrosion prediction method for building block type airplane structural member |
| CN112782060A (en) * | 2019-11-06 | 2021-05-11 | 中国石油化工股份有限公司 | Experimental device and method capable of realizing inhibition of under-scale corrosion by corrosion inhibitor |
| CN113533187A (en) * | 2021-07-21 | 2021-10-22 | 东风汽车集团股份有限公司 | Evaluation method for galvanic corrosion under thin liquid film |
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| CN103234893A (en) * | 2013-04-16 | 2013-08-07 | 北京工业大学 | Metal material galvanic couple corrosion test fixture apparatus |
| CN203786011U (en) * | 2014-04-10 | 2014-08-20 | 北京科技大学 | Experiment method and device for dynamically simulating under-deposit corrosion |
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| CN2758756Y (en) * | 2004-09-30 | 2006-02-15 | 中国海洋大学 | Observing bearing device of electrode for electrochemical corrosion experiment |
| JP2006170737A (en) * | 2004-12-15 | 2006-06-29 | Mitsubishi Electric Corp | Method and apparatus for evaluating water corrosiveness |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105699285A (en) * | 2014-11-28 | 2016-06-22 | 中国石油天然气股份有限公司 | Electrochemical device for corrosion test under elemental sulfur scale |
| CN105203449A (en) * | 2015-10-13 | 2015-12-30 | 东南大学 | Corrosion tank for reinforcing bar corrosion testing in simulated concrete pore solution |
| CN105203449B (en) * | 2015-10-13 | 2018-01-02 | 东南大学 | The corrosion pond that steel bar corrosion is tested in a kind of reinforcing steel |
| CN107192660A (en) * | 2017-05-27 | 2017-09-22 | 中国科学院上海技术物理研究所 | It is a kind of to be used for the apparatus and method that dynamic observes Cdl-x_Znx_Te chemical attack hole |
| CN107192660B (en) * | 2017-05-27 | 2023-09-12 | 中国科学院上海技术物理研究所 | Device and method for dynamically observing tellurium-zinc-cadmium material chemical corrosion pits |
| CN112782060A (en) * | 2019-11-06 | 2021-05-11 | 中国石油化工股份有限公司 | Experimental device and method capable of realizing inhibition of under-scale corrosion by corrosion inhibitor |
| CN112782060B (en) * | 2019-11-06 | 2024-05-28 | 中国石油化工股份有限公司 | Experimental device and method capable of realizing scale corrosion inhibition of corrosion inhibitor |
| CN111982799A (en) * | 2020-08-24 | 2020-11-24 | 中国人民解放军海军航空大学青岛校区 | Atmospheric corrosion prediction method for building block type airplane structural member |
| CN113533187A (en) * | 2021-07-21 | 2021-10-22 | 东风汽车集团股份有限公司 | Evaluation method for galvanic corrosion under thin liquid film |
| CN113533187B (en) * | 2021-07-21 | 2022-05-31 | 东风汽车集团股份有限公司 | Evaluation method for galvanic corrosion under thin liquid film |
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