CN101393155B - Method for continuously monitoring potential corrosion depth distribution of metallic material - Google Patents
Method for continuously monitoring potential corrosion depth distribution of metallic material Download PDFInfo
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- CN101393155B CN101393155B CN2008101073112A CN200810107311A CN101393155B CN 101393155 B CN101393155 B CN 101393155B CN 2008101073112 A CN2008101073112 A CN 2008101073112A CN 200810107311 A CN200810107311 A CN 200810107311A CN 101393155 B CN101393155 B CN 101393155B
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Abstract
The invention relates to a method for continuously monitoring microcell corrosion depth distribution of a metal material. Square resistance of a metal is measured by a four-probe method. A measuring device consists of measured plate metal, a clamp, a micro ohm meter, a conducting wire and an elastic plug; the measured metal is plate-shaped, the thickness range is between 0.1 and 10.0 millimeters, and the monitored least corrosion depth is about between 300 and 500 nanometers. The method is particularly suitable for continuously detecting microcell corrosion depth distribution of the metal in soil and concrete. In addition, the method has the application prospect in similar environments such as oil and gas pipelines, interiors of chemical engineering devices, sea water, and the like.
Description
Technical field
The present invention relates to the method that a kind of continuously monitoring metal material potential corrosion depth distributes, particularly a kind of side direct, continuous monitoring plate-shape metal material microcell hinders, and obtains the method for plate-shape metal material corrosion depth profile.
Background technology
At present at home and abroad, metal direct, continuous monitoring method of microcell corrosion in soil and concrete is blank basically.The existing experimental method of burying is long experimental period; And can only obtain the several average datas in the process of burying; Can not obtain the corrosion data of specimen surface zones of different in the corrosion process; And can not embody in the corrosion process, the variation of the corrosion behavior that causes owing to the variation of environmental factor, this mechanism and process to research metal soil corrosion and steel reinforced concrete erosion is disadvantageous.Because the singularity of soil and concrete physics and chemical property; Many physics monitoring methods are all powerless to it; Though electrochemical method can obtain some data, can not continuous monitoring, and the correlativity that gained data and actual corrosion depth distribute has a long way to go.
Summary of the invention
The purpose of this invention is to provide the method that a kind of continuously monitoring metal material potential corrosion depth distributes.Through side's resistance direct, continuously measuring discontinuous metal material microcell; Obtaining plate-shape metal material microcell continuous corrosion depth in environment distributes; To monitoring and corrosion pilot process and the corrosion mechanism of research metal material in environment such as soil, concrete, have important theory and using value.
The present invention realizes like this; Directly, the method for continuous coverage plate-shape metal microcell side resistance is a four probe method; Measurement mechanism is made up of probe, probe anchor clamps, microhmmeter, lead, elastic plug; It is characterized in that the measuring method step is following: 1. the plate-shape metal material surface with measured is clean with the 1200#SiC sand papering, behind its surface of alcohol wash, dries up with hair dryer; 2. sample is fixed on the measuring probe anchor clamps; 3. adopt four elastic plugs respectively an end of four copper wires to be connected in four copper probe connecting pipes in the back insertion probe anchor clamps; Make this four rectangular distributions of plug; After adopting four elastic plugs that the other end of these four copper wires is connected again, be connected on two current output terminals and two voltage input end on the microhmmeter; 4. tested metal sample is placed certain corrosion environment; 5. utilize the four point probe method, side's resistance of monitoring and charging to the different microcells of specimen surface changes; 6. according to the data that obtained, the corrosion depth of calculating the different microcells in metal surface distributes.
Form of metal that this method is surveyed is tabular, and its thickness is between 0.1-10.0mm, and the minimal erosion amount that can monitor is about the 300-500 nanometer.
Adopt metal side's resistance precision measurement method complexed metal microcell side's resistance measured material, can set up a kind of metal material in environment such as soil and concrete, direct, continuous monitoring method that the plate-shape metal potential corrosion depth distributes.Along with the development of microelectric technique recent years, adopting the four-wire system microhmmeter to measure the resolution of metal side's resistance can be up to 0.1 micro-ohm.With thickness is that 1 millimeter A3 carbon steel is an example, and in the scope of 3mm * 3mm, 1 micron corrosion depth will cause side's resistance variable quantity of about 0.2-0.3 micro-ohm, just can be monitored to when promptly its corrosion depth is the variable quantity about the 300-500 nanometer.For steel grades such as H20, M16, X60 and X70 annual etching extent greater than 10 microns in acid ground and concrete, the data that the annual potential corrosion depth that can obtain 20 groups of above continuous monitorings at least distributes.Therefore; Adopt this method can monitor plate-shape metal directly, continuously when corrosion takes place in environment such as soil and concrete; The corrosion depth of different tiny areas distributes, and to the relation of further investigation metal material microcell corrosion behavior and physical environment variation, inquires into its corrosion mechanism; Monitor its military service performance and its service life of prediction, all have important theory and application value.
The present invention is the method that a kind of continuous monitoring plate-shape metal material potential corrosion depth distributes, and this method can be monitored the potential corrosion depth of metal in soil, concrete environment directly, continuously and distributed.The present invention has overcome the conventional shortcoming that experimental method and electrochemical method etc. are studied metal soil corrosion and steel reinforced concrete erosion of burying; Filled up metal soil corrosion, steel reinforced concrete erosion directly, the blank that distributes of continuous monitoring potential corrosion depth, have broad application prospects, great economy and social value.
Description of drawings
Fig. 1 is a metal of the present invention microcell side resistance measurement mechanism structural drawing;
The practical implementation method
As shown in Figure 1; Directly, the method for continuous coverage plate-shape metal microcell side resistance is a four probe method; Measurement mechanism is made up of probe 1, probe anchor clamps 2, microhmmeter 3, lead 4, elastic plug 5; It is characterized in that the measuring method step is following: 1. the plate-shape metal material surface with measured is clean with the 1200#SiC sand papering, behind its surface of alcohol wash, dries up with hair dryer; 2. sample is fixed on the measuring probe anchor clamps 2; 3. adopt four elastic plugs 5 respectively an end of four copper wires 4 to be connected in four copper probe 1 connecting pipes in the back insertion probe anchor clamps 2; Make this four rectangular distributions of plug; After adopting four elastic plugs 5 that the other end of these four copper wires is connected again, be connected on two current output terminals and two voltage input end on the microhmmeter 3; 4. tested metal sample is placed certain corrosion environment; 5. utilize the four point probe method, side's resistance of monitoring and charging to the different microcells of specimen surface changes; 6. according to the data that obtained, the corrosion depth of calculating the different microcells in metal surface distributes.
Accuracy for authentication resistance method measurement metal erosion thickness is of a size of 2: long 20mm, wide 14mm; Thickness be 0.6mm A3 steel small sample under these conditions; Behind the corrosion certain hour, clean its surface and dry up, carry out mass measurement with ethanol; Weight-loss method test corrosion depth that obtains and the corrosion depth that records with square resistance method are compared, and the accuracy of corrosion depth is measured in the resistance of evaluation side.
Tabular A3 steel J (2132) microcell is at 0.5M/L H
2SO
4In corrosion data and J (2435) microcell at 1.0M/L H
2SO
4In the corrosion data (probe spacing 3.0mm) that obtains of corrosion data and weight-loss method respectively shown in table 1 and table 2.
The tabular A3 steel of table 1 J (2132) microcell is at 0.5M/L H
2SO
4In corrosion data
The tabular A3 steel of table 2 J (2435) microcell is at 1.0M/L H
2SO
4In corrosion data
Can find out that from table 1 and table 2 corrosion depth that corrosion depth that square resistance method is calculated and weight-loss method are calculated is close, explain that it is feasible measuring the plate-shape metal potential corrosion depth with square resistance method.
The corrosion monitoring of embodiment 2 tabular A3 steel different microcells in the red soil of Jiangxi
Specimen size is: long 225.4mm, wide 154.0mm, thickness are 0.8mm, with 100g red soil with distilled water furnishing pasty state; Place on the sample, whenever surveyed a secondary data, every 5ml distilled water that added at a distance from 2 days at a distance from 2 days; To keep its moisture, etching time 10 days, probe spacing 3.0mm.
For authentication resistance method is measured the accuracy of metal erosion thickness, be of a size of diameter 10mm to 2, the A3 steel small sample of high 6mm carries out zero-G test.After the off-test, clean its surface and dry up with ethanol, carry out mass measurement, weight-loss method test corrosion depth that obtains and the corrosion depth that records with square resistance method are compared, the side of evaluationing hinders the accuracy of measurement corrosion depth.
Corrosion data and the pattern of tabular A3 steel microcell in characteristic of acid red soil is as shown in table 3,
The tabular A3 steel of table 3 microcell corrosion data in characteristic of acid red soil
The weightening finish of weightless test sample is respectively 16.0mg and 11.2mg, calculates corrosion depth and is respectively 6.52 μ m and 4.72 μ m.The potential corrosion depth that resistance method in side's is measured conforms to the weightless average corrosion depth that records.
The microcell corrosion monitoring of embodiment 3 tabular 45# steel in reinforced concrete
Specimen size is: long 225.4mm, and wide 154.0mm, thickness are 0.8mm, with 409325# conch board cement, the fine sand that 30 grams are clean was allocated with an amount of distilled water, places on the sample, whenever surveyed a secondary data, etching time 10 days, probe spacing 3.0mm at a distance from 2 days.
Corrosion data and the pattern of tabular 45# steel microcell in concrete is as shown in table 4.
The tabular 45# steel of table 4 is microcell corrosion number in concrete
Claims (3)
1. the method that distributes of a continuously monitoring metal material potential corrosion depth, measurement mechanism is made up of probe, probe anchor clamps, microhmmeter, lead and elastic plug, it is characterized in that the measuring method step is following:
1>the plate-shape metal material surface with measured is clean with the 1200#SiC sand papering, behind its surface of alcohol wash, dries up with hair dryer;
2>sample is fixed on the probe anchor clamps;
3>adopt four elastic plugs respectively an end of four copper wires to be connected in four copper probe connecting pipes of back insertion probe anchor clamps; Make this four rectangular distributions of plug; After adopting four elastic plugs that the other end of these four copper wires is connected again, be connected on 2 current output terminals and 2 voltage input end on the microhmmeter;
4>tested metal sample is placed certain corrosion environment;
5>utilize the four point probe method, side's resistance of monitoring and the different microcells of record specimen surface changes;
6>according to the data that obtained, the corrosion depth of calculating the different microcells in metal surface distributes.
2. the method that a kind of according to claim 1 continuously monitoring metal material potential corrosion depth distributes, it is characterized in that: measured metal is tabular, and thickness is between 0.1-10.0mm, and minimum interval is 1h.
3. the method that a kind of according to claim 1 continuously monitoring metal material potential corrosion depth distributes, it is characterized in that: the corrosion environment of continuously measuring discontinuous metal potential corrosion depth comprises: soil, concrete.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101846644B (en) * | 2010-05-19 | 2012-05-09 | 华中科技大学 | Oil and gas pipeline corrosion online monitor |
| CN102313696B (en) * | 2010-06-29 | 2013-07-03 | 中国石油天然气股份有限公司 | Indoor simulation method for spurious interference and corrosion risk assessment and device |
| CN103207221A (en) * | 2013-03-22 | 2013-07-17 | 中交四航工程研究院有限公司 | Sensor for monitoring depth distribution of concentration and pH (potential of hydrogen) values of chloride ions in concrete protective layer and method for manufacturing sensor |
| CN113484396B (en) * | 2021-06-24 | 2024-04-09 | 中国电建集团华东勘测设计研究院有限公司 | Corrosion monitoring device and method for coupling four-probe potential drop measurement and tow electrode |
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| EP0354096A1 (en) * | 1988-07-26 | 1990-02-07 | ETAT FRANCAIS, repr. par le MIN. DE L'EQUIP., DU LOGEMENT, DE L'AMENAGEMENT DU TERR. ET TRANSP., LAB. CENT. PONTS ET CHAUSSEES | Method for the diagnosis of steel corrosion in concrete |
| CN2325782Y (en) * | 1998-04-16 | 1999-06-23 | 张郁华 | Testing calibrator of four-prob electrical resistivity instrument |
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| CN101149248A (en) * | 2007-11-09 | 2008-03-26 | 南昌航空大学 | Method for continuously monitoring metal material corrosion depth |
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Patent Citations (4)
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|---|---|---|---|---|
| EP0354096A1 (en) * | 1988-07-26 | 1990-02-07 | ETAT FRANCAIS, repr. par le MIN. DE L'EQUIP., DU LOGEMENT, DE L'AMENAGEMENT DU TERR. ET TRANSP., LAB. CENT. PONTS ET CHAUSSEES | Method for the diagnosis of steel corrosion in concrete |
| CN2325782Y (en) * | 1998-04-16 | 1999-06-23 | 张郁华 | Testing calibrator of four-prob electrical resistivity instrument |
| DE102004054856A1 (en) * | 2004-11-12 | 2006-05-24 | Hydro Aluminium Deutschland Gmbh | Metal sheet quality control, by measurements of electrical resistance, reads the resistance from two electrodes at the surfaces and also after a defined change of the surface characteristics |
| CN101149248A (en) * | 2007-11-09 | 2008-03-26 | 南昌航空大学 | Method for continuously monitoring metal material corrosion depth |
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