CN101644653A - Corrosion test device with in-situ electrochemical test function - Google Patents
Corrosion test device with in-situ electrochemical test function Download PDFInfo
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- CN101644653A CN101644653A CN200910018266A CN200910018266A CN101644653A CN 101644653 A CN101644653 A CN 101644653A CN 200910018266 A CN200910018266 A CN 200910018266A CN 200910018266 A CN200910018266 A CN 200910018266A CN 101644653 A CN101644653 A CN 101644653A
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Abstract
The invention relates to a corrosion test device with a field in-situ electrochemical test function in a natural sea area environment, belonging to the technical field of electrochemical corrosion tests. The main structure of the corrosion test device comprises a reference electrode lead wire, an auxiliary electrode lead wire, an auxiliary electrode, a reference electrode, a probe shell, a samplesealing structure shell, a sealing ring, a pressure spring, a fastening bolt, a sample and a sample lead wire, wherein an electrochemical test probe and a sample sealing structure are designed into split type structures; the electrochemical test probe consists of the reference electrode, the reference electrode lead wire, the auxiliary electrode and the probe shell and is rotated to the sample sealing structure through screw threads positioned at the front of the probe shell; the sample sealing structure shell is processed by and made of plastic and nylon or other non-metal materials; and thesample or the researched electrode is hermetically fixed by the O-shaped sealing ring and sealing stuffing. The invention has simple and reliable structural principle, convenient use and operation andgood test accuracy.
Description
Technical field:
The invention belongs to the electrochemical corrosion test technical field, relate to a kind of being used for and have the corrosion testing apparatus that in-situ electrochemical test function is carried out at the scene at natural marine environment.
Background technology:
Material and member thereof in use are subjected to the influence of factor of natural environment, and it is aging that burn into takes place gradually, even lose efficacy.The physical environment difference, the corrosion ageing properties that causes material has bigger difference with the influence of natural environmental condition, has caused the environmental suitability of material in different physical environments to differ greatly.Generally adopt the method for in typical physical environment, setting up Natural Environmental Test station (field) at present in the world, Natural Environmental Test by material, grasp the corrosion aging rule of material in all kinds of physical environments, and factor of natural environment changes the combined influence to material property.Natural Environmental Test is the important means of evaluating material performance, and data that obtain by Natural Environmental Test and rule near actual service conditions, have crucial meaning for reasonable material, correct protection accurately and reliably.20th century, the fifties began, and set up a plurality of Natural Environmental Test station in succession, carried out a large amount of natural environment corrosion tests, accumulated the aging data of many corrosion.But the development of nature seawater environmental test technology is slow relatively, and its reason mainly is because marine environment is very harsh, and is subjected to the influence of morning and evening tides and ocean current, and is higher to the requirement of detection means.
The nature seawater environmental test of metal material, mainly undertaken by weight-loss method, test method is directly sample to be exposed in the physical environment to test, corrosive nature according to the weight loss evaluating material of unit area, but because edge effect, the corrosion speed at the edge of test specimen and four angles is wanted obvious corrosion speed greater than the plane, therefore can cause the test findings distortion, in order to address this problem, at present the method that adopts is the area that adds the bulk specimen workplace, improves the area ratio of workplace and side, to reduce edge effect, so just must cause specimen size bigger, increase experimentation cost; In addition, because test specimen is directly exposed in the seawater for a long time, for the ease of distinguishing sample, adopt the method for punching sign, but the influence of adhering to owing to corrosion and marine growth, particularly the sample of seriously corroded identifies easily destroyed even disappearance, and the sampling and analysing work after the test is brought difficulty.Along with the increase of sample type, test period and test site band, the quantity of punching also will increase, and test findings is certainly led to adverse influence simultaneously.
Nature seawater environmental test for the coated layer system material, especially the Corrosion Protection of organic coating system in the nature seawater environment just carries out qualitative evaluation according to GB/T1766-1995 " ranking method of paint and varnish coating aging " by the ocular estimate of routine, the data of obtaining are very limited, more can't obtain the parent metal material in the organic coating system corrosion information of different ageing steps.Metal material and the corrosion failure of coated layer system in the nature seawater environment are caused by the galvanic corrosion reaction mostly, therefore can obtain the information of metallic material corrosion and the variation of coated layer barrier propterty thereof by the variation that detects electrochemical signals.At present, the electro-chemical test means have been widely used in the laboratory study of the aging behavior of metal material and coated layer system corrosion, and ISO (International Standards Organization) and american society for testing and materials etc. organize and all formulated relevant electro-chemical test standard and be used for the test that gauge material is corroded ageing properties.The research level that can improve material nature seawater environmental test is detected at the scene that Electrochemical Measurement Technology is applied to the nature seawater environmental test, is the important means of obtaining more material nature seawater environmental test data.Laboratory condition carries out but existing electro-chemical test is based on mostly, also be not advantageously applied to the on-the-spot in situ detection of nature seawater environmental test, its main cause is that existing natural briny environment test unit can't directly carry out electro-chemical test, and on-the-spot electrochemical in-situ test result can be subjected to the influence of morning and evening tides ocean current and sample edge effect, therefore the rig-site utilization of Electrochemical Measurement Technology needs test unit reasonable in design, reduces the influence of external factor to Electrochemical results to greatest extent.Conclusion is got up, and the prior art ubiquity electrochemical in-situ test technology complexity, and measuring accuracy is poor, is subjected to environmental influence obvious, and the equipment therefor complex structure uses operation inconvenience, shortcomings such as security and stability difference.
Summary of the invention:
The objective of the invention is to overcome the shortcoming that prior art exists, seek a kind of corrosion testing apparatus that can carry out the electrochemical in-situ test of development and design, be used for the corrosion exposure test of nature seawater environment metal material and coated layer system, realize on-the-spot in-situ electrochemical test function, avoid the influence of edge effect to material electrochemical test and corrosion test result, reduce the size and the weight of test specimen, solve the problem that metal material and coated layer system carry out electrochemical in-situ test existence in the easily destroyed and nature seawater environmental test of sample sign, for the evaluation of metal material and coated layer system provides the electrochemical reference foundation.
To achieve these goals, agent structure of the present invention comprises contrast electrode lead-in wire, auxiliary electrode lead-in wire, auxiliary electrode, contrast electrode, probing shell, sample hermetically-sealed construction shell, O-ring seal, holddown spring, fastening bolt, sample and sample lead-in wire; Adopt the design of electrochemical test probe and sample hermetically-sealed construction two parts split-type structural, electrochemical test probe is made up of contrast electrode, contrast electrode lead-in wire, auxiliary electrode and probing shell, and electrochemical test probe passes through the screw thread rotation of probing shell front portion to the sample hermetically-sealed construction; Contrast electrode adopts solid reference electrodes such as silver/silver chloride, high purity zinc, and contrast electrode and auxiliary electrode are separately fixed on the probing shell and are welded with the contrast electrode lead-in wire respectively and the auxiliary electrode lead-in wire; Auxiliary electrode adopts inert electrodes such as platinized platinum, copper sheet, stainless steel substrates or graphite; Probing shell adopts plastics, nylon or other nonmetallic materials to make; Sample hermetically-sealed construction shell adopts plastics, nylon or other nonmetallic materials to be processed into, by O RunddichtringO and sealing inserts with sample or research electrode sealing and fixing, guarantee that sample or research electrode have only one side to contact with briny environment, the edge of sample is sealed in the sample hermetically-sealed construction shell, avoids the influence of edge effect to Electrochemical results and weightless result; When carrying out zero-G test, the sample seal structure directly is exposed in the briny environment corrosive nature of coming evaluating material according to the weightlessness of sample exposure unit area; When carrying out the field electrochemical test, electrochemical test probe is matched with the sample hermetically-sealed construction by screw thread, form the electrolytic cell of a relative closure, reduce the interference that the site environment factors vary causes Electrochemical results; Contrast electrode and auxiliary electrode in sample in the hermetically-sealed construction shell or research electrode and the electrochemical test probe constitute conventional three-electrode electro Chemical test system, be connected to electrochemical workstation by contact conductor, carry out the situ measurement of corrosion electrochemistry parameter.
The present invention will carry out exposure test after the sealing around the test specimen under the prerequisite that does not influence the sample corrosion behavior again; Match by helicitic texture between electrochemical test probe and the sample hermetically-sealed construction, be convenient to disassemble, make up, be suitable for the corrosion exposure test and the electro-chemical test of sample or research electrode; Electrolytic cell by a screw thread and a relative closure of sample hermetically-sealed construction formation reduces the interference that the site environment factors vary causes Electrochemical results; On the sample hermetically-sealed construction, test specimen is identified, avoid causing the destruction of sign and the adverse effect that too much punching sign causes test findings because of corrosion.
The present invention compared with prior art, solve metal material and coated layer system and in the nature seawater environment, carried out problems such as edge effect influence that the test of on-the-spot electrochemical in-situ exists and ocean current impact, break through the limitation of original test method, improve the test capability and the scientific research level of natural environment corrosion test research field, reduce experimentation cost, have remarkable economic efficiency and social benefit, its structural principle is simple and reliable, use easy to operately, test accuracy is good.
Description of drawings:
Fig. 1 is a cross-section structure principle schematic of the present invention.
Embodiment:
Be described further below in conjunction with accompanying drawing and by embodiment.
Embodiment:
The agent structure of the on-the-spot corrosion testing apparatus that present embodiment relates to comprises contrast electrode lead-in wire 1, auxiliary electrode lead-in wire 2, auxiliary electrode 3, contrast electrode 4, probing shell 5, sample hermetically-sealed construction shell 6, O-ring seal 7, holddown spring 8, fastening bolt 9, sample 10 and sample lead-in wire 11, one-piece construction adopts plastics, nylon or other nonmetallic materials to be processed into, the split-type structural design comprises electrochemical test probe and sample hermetically-sealed construction two parts; Electrochemical test probe passes through the screw thread rotation of probing shell 5 front portions to sample hermetically-sealed construction shell, and electrochemical test probe is made up of contrast electrode lead-in wire 1, auxiliary electrode lead-in wire 2, auxiliary electrode 3, contrast electrode 4 and probing shell 5 electric connections; Contrast electrode 4 and auxiliary electrode 3 are separately fixed on the probing shell 5, and weld contrast electrode lead-in wire 1 and auxiliary electrode lead-in wire 2 respectively; The sample hermetically-sealed construction is by sample hermetically-sealed construction shell 6, O-ring seal 7, holddown spring 8, fastening bolt 9, sample (research electrode) 10 and sample lead-in wire 11; Sample hermetically-sealed construction shell 6 with sample (research electrode) 10 sealing and fixing, is welded with sample lead-in wire 11 by O-ring seal 7, holddown spring 8 and fastening bolt 9 on the sample 10.Electrochemical test probe is made up of contrast electrode 4, auxiliary electrode 3 and probing shell 5, contrast electrode 4 adopts solid reference electrodes such as silver/silver chloride, high purity zinc, auxiliary electrode 3 adopts inert electrodes such as platinized platinum, copper sheet, stainless steel substrates or graphite, and probing shell 5 adopts plastics, nylon or other nonmetallic materials to make; Sample hermetically-sealed construction shell 6 adopts plastics, nylon or other nonmetallic materials to make, by O RunddichtringO 7 and sealing inserts with sample 10 (research electrode) sealing and fixing, guarantee that sample 10 (research electrode) has only one side to contact with briny environment, all edges of sample 10 all are sealed in the sample hermetically-sealed construction shell 6, effectively solve the influence of edge effect to Electrochemical results and weightless result; When carrying out zero-G test, only need the sample seal structure directly is exposed in the briny environment corrosive nature of coming evaluating material according to the weightlessness of sample exposure unit area; When carrying out the field electrochemical test, electrochemical test probe is matched with the sample hermetically-sealed construction by screw thread, form the electrolytic cell of a relative closure, reduce the interference that the site environment factors vary causes Electrochemical results; Sample 10 (research electrode) in the sample hermetically-sealed construction and the contrast electrode 4 in the electrochemical test probe and auxiliary electrode 3 constitute classical three-electrode electro Chemical test system, be connected to electrochemical workstation by contact conductor, carry out the situ measurement of every corrosion electrochemistry parameter.
Present embodiment will carry out exposure test after the sealing around the test specimen under the prerequisite that does not influence the sample corrosion behavior again; Match by helicitic texture between electrochemical test probe and the sample hermetically-sealed construction shell 6, be convenient to disassemble, make up, be suitable for the corrosion exposure test and the electro-chemical test of sample 10 (research electrode); Form the electrolytic cell of a relative closure by screw thread and sample hermetically-sealed construction 6; On sample hermetically-sealed construction shell 6, test specimen is identified, avoid causing the destruction of sign and the adverse effect that too much punching sign causes test findings because of corrosion; Electrochemical test probe matches with sample hermetically-sealed construction shell 6 by screw thread, forms the electrolytic cell of sealing, reduces the interference that the site environment factors vary causes Electrochemical results.
Claims (1)
1, a kind of corrosion testing apparatus with in-situ electrochemical test function, agent structure comprises contrast electrode lead-in wire, auxiliary electrode lead-in wire, auxiliary electrode, contrast electrode, probing shell, sample hermetically-sealed construction shell, O-ring seal, holddown spring, fastening bolt, sample and sample lead-in wire, it is characterized in that adopting the design of electrochemical test probe and sample hermetically-sealed construction two parts split-type structural, the electrochemical test probe of being made up of contrast electrode, contrast electrode lead-in wire, auxiliary electrode and probing shell passes through the screw thread rotation of probing shell front portion to the sample hermetically-sealed construction; Contrast electrode adopts silver/silver chloride or high purity zinc solid reference electrode, and contrast electrode and auxiliary electrode are separately fixed on the probing shell and are welded with the contrast electrode lead-in wire respectively and the auxiliary electrode lead-in wire; Auxiliary electrode adopts platinized platinum, copper sheet, stainless steel substrates or graphite inert electrode; Probing shell and sample hermetically-sealed construction shell adopt plastics, nylon or other nonmetallic materials to be processed into, by O RunddichtringO and sealing inserts with sample or research electrode sealing and fixing, sample or research electrode have only one side to contact with briny environment, the edge of sample is sealed in the sample hermetically-sealed construction shell, avoids the influence of edge effect to Electrochemical results and weightless result; When carrying out zero-G test, the sample seal structure directly is exposed in the briny environment corrosive nature of coming evaluating material according to the weightlessness of sample exposure unit area; When carrying out the field electrochemical test, electrochemical test probe is matched with the sample hermetically-sealed construction by screw thread, form the electrolytic cell of a relative closure, reduce the interference that the site environment factors vary causes Electrochemical results; Contrast electrode and auxiliary electrode in sample in the hermetically-sealed construction shell or research electrode and the electrochemical test probe constitute conventional three-electrode electro Chemical test system, be connected to electrochemical workstation by contact conductor, realize the situ measurement of corrosion electrochemistry parameter.
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| CN104596917A (en) * | 2015-01-19 | 2015-05-06 | 青岛雪龙节能环保科技有限公司 | Seawater system corrosion-prevention and anti-scaling capability and mechanism research experimental device |
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