CN105973970A - Method for detecting corrosion sensitivity of austenitic stainless steel - Google Patents
Method for detecting corrosion sensitivity of austenitic stainless steel Download PDFInfo
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- CN105973970A CN105973970A CN201610283611.0A CN201610283611A CN105973970A CN 105973970 A CN105973970 A CN 105973970A CN 201610283611 A CN201610283611 A CN 201610283611A CN 105973970 A CN105973970 A CN 105973970A
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Abstract
The invention provides a method for detecting the corrosion sensitivity of austenitic stainless steel. The method is characterized in that the reactivation peak current density of austenitic stainless steel is acquired through adopting an EPR technology to determine the relation between the reactivation peak current density and the corrosion degree in order to determine the corrosion degree of the austenitic stainless steel to be measured, and the detection result is accurate and stable.
Description
Technical field
The present invention relates to a kind of method detecting austenitic stainless steel corrosion susceptibility, belong to technical field of electrochemistry.
Background technology
After the austenitic stainless steel of solution treatment is at sensitized treatment crystal boundary can carbide precipitate, cause crystal boundary chromium depleted existing
As, the austenitic stainless steel that heavy corrosion is actually used.The equipment of employing austenite stainless steel making causes due to corrosion failure
Loss serious, it is very urgent that stainless increasingly extensive application causes studying its etching problem.
EPR, i.e. electrochemistry reactivation, be should in the existing evaluation various method of stainless steel intercrystalline corrosion sensitivity
By extensive and ripe method, there is the features such as quick, lossless and quantitative, industry spot examination requirements can be met.EPR Fa Changcai
Use H2SO4 + KSCN electrolyte, KSCN medium Main Function acts as reacting movable agent, i.e. during the reactivation of EPR method
Accelerate the dissolving of the imperfect passivating film of Cr depletion zone.
Summary of the invention
The present invention is to solve drawbacks described above and deficiency present in prior art, it is provided that a kind of detection austenite stainless
The method of steel corrosion sensitivity, the method gathers the reactivation peak current density of austenitic stainless steel by EPR method, and then sentences
Its extent of corrosion disconnected, result is precise and stable.
For solving above-mentioned technical problem, the present invention provides a kind of method detecting austenitic stainless steel corrosion susceptibility, adopts
Use electrochemistry reactivation, i.e. EPR method obtains reactivation peak current densityI r, according to reactivation peak current densityI rJudge stainless extent of corrosion, specifically include following steps:
Step one, determines detection equipment, prepares standard specimen, carries out austenitic stainless steel at sensitization under the conditions of different sensitizations
Reason, obtains the standard specimen that extent of corrosion is different；Sensitized treatment process is, by austenitic stainless steel water after 950 DEG C of insulation 2h
Quench, be then placed in chamber type electric resistance furnace sensitization difference under 600 DEG C, 650 DEG C, 700 DEG C, 750 DEG C and 800 DEG C of sensitizing temperatures respectively
Quickly cooling after time, obtains the standard specimen that extent of corrosion is different, stand-by；
Step 2, optimizes detection parameter, uses field mouth method optimization detection device parameter and electrolyte parameter；
Step 3, utilizes EPR method to obtain standard specimen reactivation peak current densityI r, and to activation peak current densityI r
It is analyzed processing, it is thus achieved that reactivation peak current densityI rAnd the relation between extent of corrosion；
Step 4, repeats the step of step 3, it is thus achieved that the reactivation peak of austenitic stainless steel to be measured to austenitic stainless steel to be measured
Value electric current densityI o；
Step 5, by the reactivation peak current density of austenitic stainless steel to be measuredI oBring the curve chart in step 3 into, obtain
The extent of corrosion of austenitic stainless steel to be measured.
Wherein, in described step one, detection equipment is three-electrode cell PS-268A type electrochemical meter, austenite
Rustless steel is 304 rustless steels, and through epoxy encapsulation after sensitized treatment, work surface SiC waterproof abrasive paper is polished to step by step from No. 300
No. 2000, water uses dehydrated alcohol oil removing after cleaning, and deionized water dries up stand-by after cleaning.
In described step 2, detection device parameter is specifically, flyback current potentialE=300mV and scanning speedV =100mV·
min-1；The required electrolyte of EPR test be 0.5mol/L sulphuric acid and 0.01mol/L potassium rhodanate aqueous solution or 1.0mol/L sulphuric acid and
0.5mol/L sodium-chloride water solution, test temperature is 25 ± 1 DEG C.
Working electrode is placed in electrolyzer standing 10min by step 3 before starting, after instrument OCP is stable with
100mV·min-1Sweep speed forward is swept at passivation region 300mV, then with phase same rate reverse scan to take-off potential, and examination
Testing data sampling period is 5s.
After EPR test, after working electrode is cleaned with deionized water, ultrasonic Treatment 5min in dehydrated alcohol, dry up
The erosion profile of the rear employing tested austenitic stainless steel of metallography microscope sem observation.
The Advantageous Effects that the present invention is reached: the present invention provides a kind of austenitic stainless steel corrosion susceptibility of detecting
Method, the method uses EPR method to gather the reactivation peak current density of austenitic stainless steel, so that it is determined that reactivation peak electricity
Relation between current density and extent of corrosion, and then judge the extent of corrosion of austenitic stainless steel to be measured, testing result is more smart
The most stable.
Accompanying drawing explanation
The reactivation peak of the standard specimen of sensitized treatment different time when Fig. 1 embodiment of the present invention sensitizing temperature is 700 DEG C
Value electric current density Ir and the graph of relation of sensitization time t；
When Fig. 2 embodiment of the present invention sensitizing temperature is 700 DEG C, the sensitization degree DOS of the standard specimen of sensitized treatment different time is with quick
The graph of relation of change time t；
Fig. 3 embodiment of the present invention sensitizing temperature is the erosion profile figure of 650 DEG C of sensitized treatment different times；
Fig. 4 embodiment of the present invention sensitizing temperature is the erosion profile figure of 700 DEG C of sensitized treatment different times；
Fig. 5 embodiment of the present invention sensitizing temperature is the erosion profile figure of 750 DEG C of sensitized treatment different times.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.Following example are only used for clearly illustrating the present invention
Technical scheme, and can not limit the scope of the invention with this.
The present invention provides a kind of method detecting austenitic stainless steel corrosion susceptibility, uses electrochemistry potentiokinetic reactivation
Method, i.e. EPR method obtains reactivation peak current densityI r, according to reactivation peak current densityI rJudge stainless corrosion journey
Degree, specifically includes following steps:
Step one, determines detection equipment, prepares standard specimen, carries out austenitic stainless steel at sensitization under the conditions of different sensitizations
Reason, obtains the standard specimen that extent of corrosion is different；Sensitized treatment process is, by austenitic stainless steel water after 950 DEG C of insulation 2h
Quench, be then placed in chamber type electric resistance furnace sensitization difference under 600 DEG C, 650 DEG C, 700 DEG C, 750 DEG C and 800 DEG C of sensitizing temperatures respectively
Quickly cooling after time, obtains the standard specimen that extent of corrosion is different, then through epoxy encapsulation, work surface with SiC waterproof abrasive paper from
No. 300 are polished to No. 2000 step by step, and water uses dehydrated alcohol oil removing after cleaning, and deionized water dries up stand-by after cleaning.
Detection equipment uses three-electrode cell PS-268A type electrochemical meter, and austenitic stainless steel uses 304 stainless
Steel.
Step 2, optimizes detection parameter, uses field mouth method optimization detection device parameter and electrolyte parameter；
Detection device parameter is specifically, flyback current potentialE=300mV and scanning speedV =100mV·min-1；EPR test is required
Electrolyte is 0.5mol/L sulphuric acid and 0.01mol/L potassium rhodanate aqueous solution or 1.0mol/L sulphuric acid and 0.5mol/L sodium chloride water
Solution, test temperature is 25 ± 1 DEG C.
Step 3, utilizes EPR method to obtain standard specimen reactivation peak current densityI r, and to activation peak current densityI rIt is analyzed processing, it is thus achieved that reactivation peak current densityI rAnd the relation between extent of corrosion；
Before EPR on-test, working electrode was placed in electrolyzer standing 10min, after instrument OCP is stable with
100mV·min-1Sweep speed forward is swept at passivation region 300mV, then with phase same rate reverse scan to take-off potential, and examination
Testing data sampling period is 5s.
Step 4, repeats the step of step 3, it is thus achieved that living again of austenitic stainless steel to be measured to austenitic stainless steel to be measured
Change peak current densityI o；
Step 5, by the reactivation peak current density of austenitic stainless steel to be measuredI oBring the curve chart in step 3 into, obtain
The extent of corrosion of austenitic stainless steel to be measured.
After EPR test, after working electrode is cleaned with deionized water, ultrasonic Treatment 5min in dehydrated alcohol, dry up
The erosion profile of the rear employing tested austenitic stainless steel of metallography microscope sem observation.
Embodiment
In order to the technique effect of the present invention is described, now select sensitizing temperature be 700 DEG C after different sensitization times process
One group of standard specimen, it is thus achieved that the reactivation peak current density of standard specimen and the graph of relation of sensitization time, such as Fig. 1 institute
Showing, as can be seen from Figure 1 reactivation peak current density Ir presents positive correlation with sensitization time, i.e. when reactivation peak
When value electric current density Ir increases, Cr depletion zone corrosion is the most higher, it can be seen that austenitic stainless steel intergranular is rotten from erosion profile figure
Erosion sensitivity is along with sensitization time correlation, as shown in Figure 3-Figure 5, wherein, and 3-(a), 3-(b), 3-(c) in Fig. 3
, 3-(d) represent that sensitization time is 5min, 10min, 1h, 10h respectively, in Fig. 4,4-(a), 4-(b), 4-(c) represent quick respectively
The change time is 1min, 10min, 3h, in Fig. 5 5-(a), 5-(b), 5-(c), 5-(d) represent respectively sensitization time be 1min,
5min, 30min, 3h, therefore evaluate Intergranular Corrosion of Austenitic Stainless Steel sensitivity with reactivation peak current density Ir more smart
The most stable.
In prior art, typically employing sensitization degree DOS is as the judge index of Intergranular Corrosion of Austenitic Stainless Steel, but from quick
From the point of view of change degree DOS and the relation curve of sensitization time, as in figure 2 it is shown, along with the increase of sensitization time, degree DOS is the quickest in sensitization
The slope of change time reduces on the contrary, and this explanation sensitization degree DOS evaluates Intergranular Corrosion of Austenitic Stainless Steel sensitivity and exists certain
Limitation.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, on the premise of without departing from the technology of the present invention principle, it is also possible to make some improvement and deformation, these improve and deformation
Also should be regarded as protection scope of the present invention.
Claims (5)
1. the method detecting austenitic stainless steel corrosion susceptibility, it is characterised in that: use electrochemistry potentiokinetic reactivation
Method, i.e. EPR method obtains reactivation peak current densityI r, according to reactivation peak current densityI rJudge stainless corrosion journey
Degree, specifically includes following steps:
Step one, determines detection equipment, prepares standard specimen, carries out austenitic stainless steel at sensitization under the conditions of different sensitizations
Reason, obtains the standard specimen that extent of corrosion is different；Sensitized treatment process is, by austenitic stainless steel water after 950 DEG C of insulation 2h
Quench, be then placed in chamber type electric resistance furnace sensitization difference under 600 DEG C, 650 DEG C, 700 DEG C, 750 DEG C and 800 DEG C of sensitizing temperatures respectively
Quickly cooling after time, obtains the standard specimen that extent of corrosion is different, stand-by；
Step 2, optimizes detection parameter, uses field mouth method optimization detection device parameter and electrolyte parameter；
Step 3, utilizes EPR method to obtain standard specimen reactivation peak current densityI r, and to activation peak current densityI rEnter
Row analyzing and processing, it is thus achieved that reactivation peak current densityI rAnd the relation between extent of corrosion；
Step 4, repeats the step of step 3, it is thus achieved that the reactivation peak of austenitic stainless steel to be measured to austenitic stainless steel to be measured
Value electric current densityI o；
Step 5, by the reactivation peak current density of austenitic stainless steel to be measuredI oBring the curve chart in step 3 into, treated
Survey the extent of corrosion of austenitic stainless steel.
The method of detection austenitic stainless steel corrosion susceptibility the most according to claim 1, it is characterised in that: described step
In one, detection equipment is three-electrode cell PS-268A type electrochemical meter, and austenitic stainless steel is 304 rustless steels, sensitization
Through epoxy encapsulation after process, work surface SiC waterproof abrasive paper is polished to No. 2000 step by step from No. 300, with anhydrous after water cleaning
Ethanol oil removing, deionized water dries up stand-by after cleaning.
The method of detection austenitic stainless steel corrosion susceptibility the most according to claim 1, it is characterised in that: described step
In two, detection device parameter is specifically, flyback current potentialE=300mV and scanning speedV =100mV·min-1；EPR test is required
Electrolyte is 0.5mol/L sulphuric acid and 0.01mol/L potassium rhodanate aqueous solution or 1.0mol/L sulphuric acid and 0.5mol/L sodium chloride water
Solution, test temperature is 25 ± 1 DEG C.
The method of detection austenitic stainless steel corrosion susceptibility the most according to claim 1, it is characterised in that: step 3 is opened
Before beginning, working electrode is placed in electrolyzer standing 10min, with 100mV min after instrument OCP is stable-1Sweep speed
Forward is swept at passivation region 300mV, and then with phase same rate reverse scan to take-off potential, the test data sampling period is 5s.
The method of detection austenitic stainless steel corrosion susceptibility the most according to claim 5, it is characterised in that: EPR tests
After, after working electrode is cleaned with deionized water, ultrasonic Treatment 5min in dehydrated alcohol, use metallurgical microscope after drying up
Observe the erosion profile of tested austenitic stainless steel.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105929011A (en) * | 2016-04-29 | 2016-09-07 | 河海大学常州校区 | Corrosive pitting detection method for intergranular corrosion of stainless steel |
| RU2702796C1 (en) * | 2019-01-22 | 2019-10-11 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" | Electrochemical cell for determination of steels resistance against intergranular corrosion |
| CN112683766A (en) * | 2020-12-22 | 2021-04-20 | 重庆市食品药品检验检测研究院 | Method for detecting fluorine resistance of tantalum and titanium materials |
| CN113899682A (en) * | 2021-08-30 | 2022-01-07 | 振石集团东方特钢有限公司 | Method for detecting corrosion sensitivity of duplex stainless steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105929011A (en) * | 2016-04-29 | 2016-09-07 | 河海大学常州校区 | Corrosive pitting detection method for intergranular corrosion of stainless steel |
| CN105929011B (en) * | 2016-04-29 | 2018-10-26 | 河海大学常州校区 | A kind of spot corrosion detection method of stainless steel intercrystalline corrosion |
| RU2702796C1 (en) * | 2019-01-22 | 2019-10-11 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" | Electrochemical cell for determination of steels resistance against intergranular corrosion |
| CN112683766A (en) * | 2020-12-22 | 2021-04-20 | 重庆市食品药品检验检测研究院 | Method for detecting fluorine resistance of tantalum and titanium materials |
| CN113899682A (en) * | 2021-08-30 | 2022-01-07 | 振石集团东方特钢有限公司 | Method for detecting corrosion sensitivity of duplex stainless steel |
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