CN101245483B - Wave carrier passivating treatment method of diphasic stainless steel - Google Patents
Wave carrier passivating treatment method of diphasic stainless steel Download PDFInfo
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- CN101245483B CN101245483B CN2008100641471A CN200810064147A CN101245483B CN 101245483 B CN101245483 B CN 101245483B CN 2008100641471 A CN2008100641471 A CN 2008100641471A CN 200810064147 A CN200810064147 A CN 200810064147A CN 101245483 B CN101245483 B CN 101245483B
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Abstract
The invention provides an alternating voltage passivation processing method of a duplex stainless steel. Na2SO4 of 0.5mol/L is taken as alternating voltage passivation solution and the duplex stainless steel goes through alternating voltage passivating treatment in the following potential square wave parameters: positive half-period potential Eh=1225mV, negative half-period potential E1= -700mV, frequency f = 30Hz, duty ratio k =70 percent, passivation time t =30min and temperature is normal temperature. The alternating voltage passivation processing method combines the characteristics of theduplex stainless steel, tries to apply the alternating voltage passivation to the duplex stainless steel, uses potential square waves for processing a surface passivation film of the duplex stainlesssteel and finds out the best technique parameters. A research proves that after alternating voltage passivating treatment, the surface of a duplex stainless steel sample shows unique microstructure and both ferrite and austenite are passivated, thus obviously increasing Cr content and greatly improving corrosion resistance property.
Description
(1) technical field
What the present invention relates to is the Wave carrier passivating treatment method of a kind of surface treatment method of material, particularly a kind of material.Specifically a kind of alternating voltage passivation is handled the method for duplex stainless steel.
(2) background technology
But duplex stainless steel has the advantage of ferritic stainless steel and austenitic stainless steel concurrently as a kind of good welding construction material, has obtained quoting all the more widely in some relatively harsher media environments.The most outstanding characteristics of duplex stainless steel are to have higher intensity and good anti-local corrosion performance, and continuation improves its anti-local corrosion performance on this basis, its strength characteristics is not fully exerted, the broadened application scope has very important theory and practical significance undoubtedly.Mainly concentrate on aspects such as its smelting process, welding process, heat treating method about last mutually stainless report at present.For example number of patent application is 200710049567.8 (publication number CN101109059), and name is called in the application for a patent for invention file of " a kind of high resistivity high magnetic conduction martensite-ferrite diphasic stainless steel and thermal treatment process thereof " disclosed technical scheme etc.
Passivation research both at home and abroad at present to duplex stainless steel is less, it mainly is the method that adopts the anode constant potential polarization, but effect is unsatisfactory, since phase late 1980s, the Cao Chunan researcher proposed the alternating voltage passivation thinking, each researcher always is the further investigation of austenitic stainless steel being carried out alternating voltage passivation, and to microstructure and property all have obvious own characteristic duplex stainless steel nobody relate to.
(3) summary of the invention
The object of the present invention is to provide a kind of Wave carrier passivating treatment method of duplex stainless steel of the performance that can improve duplex stainless steel greatly.
The object of the present invention is achieved like this:
With 0.5mol/LNa
2SO
4Be alternating voltage passivation solution, under following current potential square wave parameter, the two-phase Stainless Steel carried out alternating voltage passivation and handle: positive half cycle current potential E
h=1225mV, negative half period current potential E
1=-700mV, frequency f=30Hz, dutycycle k=70%, passivation time t=30min, temperature is a normal temperature.
Adopt EDS to analyze distribution of two-phase element and variation in the surperficial certain depth scope; At 0.4mol/LNaCl+0.25mol/LH
2SO
4Measure electrokinetic potential polarization curve, electrochemical impedance spectroscopy and Mott-Schottky curve in the solution.Show that by analysis the duplex stainless steel solidity to corrosion improves greatly behind the alternating voltage passivation.
Fig. 1 is the surface picture of duplex stainless steel behind alternating voltage passivation, and as can be seen from Figure 1, α phase (dark color) has all generated passive film on (light color) mutually with γ, and the pattern of the two is different.
Duplex stainless steel is behind alternating voltage passivation, and the element in the surperficial certain depth scope distributes bigger variation has also taken place, and the test result of EDS sees Table 1.
As can be seen from Table 1, behind the alternating voltage passivation in the specimen surface certain depth scope content of Cr on two-phase, all increase to some extent, Fe then reduces to some extent, alternating voltage passivation is described after the specimen surface solidity to corrosion be improved.
At 0.4mol/LNaCl+0.25mol/L H
2SO
4Compare the electrokinetic potential polarization curve of the duplex stainless steel of handling through alternating voltage passivation processing, direct current Passivation Treatment and unpassivated in the solution, its result lists Fig. 2 in.From Fig. 2, can significantly find out, the sample after alternating voltage passivation is handled, corrosion potential has a more substantial increase, and ties up blunt electric current and has reduced about 1.5 orders of magnitude, so behind alternating voltage passivation, the corrosion resistance nature of duplex stainless steel is greatly increased.The direct current passivation does not then almost have effect to duplex stainless steel.
At 0.4mol/LNaCl+0.25mol/L H
2SO
4Compare the electrochemical impedance spectroscopy of the duplex stainless steel of handling through alternating voltage passivation, direct current passivation and unpassivated in the solution, its result lists Fig. 3 in.Simulate membrane resistance through Fig. 3 with corresponding equivalent electrical circuit, find the big several magnitude of membrane resistance of alternating voltage passivation caudacoria resistance ratio direct current passivation and unpassivated, erosion resistance improves greatly.
At 0.4mol/LNaCl+0.25mol/L H
2SO
4The Mott-Schottky curve that compares the duplex stainless steel of handling through alternating voltage passivation processing, direct current Passivation Treatment and unpassivated in the solution is as Fig. 4.From Fig. 4, can significantly find out, the sample that the linear portion slope of the Mott-Schottky curve of the sample after alternating voltage passivation is handled is obviously handled greater than direct current passivation and unpassivated, and slope is big more, and passivating film carrier density is more little, and erosion resistance is just good more.So the erosion resistance of the duplex stainless steel of handling through alternating voltage passivation improves greatly.
The present invention attempts alternating voltage passivation is applied to duplex stainless steel in conjunction with the own characteristic of duplex stainless steel, and utilization current potential square wave is handled the duplex stainless steel surface passivated membrane, finds out its optimal processing parameter.Studies show that after alternating voltage passivation was handled, the duplex stainless steel specimen surface showed unique tissue topography, ferrite and austenite two-phase all obtain passivation, and containing the Cr amount obviously increases, and corrosion resistance nature is greatly improved.
The present invention has following advantage:
1, passivation effect is very good.Utilize the current potential square wave that the duplex stainless steel surface passivated membrane is handled, make ferrite and austenite two-phase all obtain better passivation, thereby improved the corrosion resistance nature of material on the whole greatly, passivation effect is far superior to the constant potential polarization method.
2,, belong to environmental protection technology, nontoxic pollution-free than traditional surface treatment method;
3, the present invention can carry out at normal temperatures, and temperature is not had particular requirement;
4, technological operation of the present invention is simple, is easy to control, and film-formation result is good;
5, this technology is simple to equipment requirements, can finish under the civil power condition, and is with low cost, is fit to very much suitability for industrialized production.
(4) description of drawings
Fig. 1 is the surface picture of duplex stainless steel behind alternating voltage passivation.
Fig. 2 is at 0.4mol/LNaCl+0.25mol/L H
2SO
4The electrokinetic potential polarization curve that compares the duplex stainless steel of handling through alternating voltage passivation processing, direct current Passivation Treatment and unpassivated in the solution.
Fig. 3 is at 0.4mol/LNaCl+0.25mol/L H
2SO
4The electrochemical impedance spectroscopy that compares the duplex stainless steel of handling through alternating voltage passivation, direct current passivation and unpassivated in the solution.
Fig. 4 is at 0.4mol/LNaCl+0.25mol/L H
2SO
4The Mott-Schottky curve that compares the duplex stainless steel of handling through alternating voltage passivation processing, direct current Passivation Treatment and unpassivated in the solution.
(5) embodiment
For example the present invention is done in more detail below and describes:
1, employed material is an ASTM A890 3A duplex stainless steel in the experiment, and its chemical ingredients is 0.028C, 25.6Cr, 5.37Ni, 2.40Mo, 0.23N, 0.45Si, 0.36Mn, 0.027P, 0.007S, Fe surplus.Adopt the vacuum oven melting, through 1100 ℃, 1h solution heat treatment, water-cooled.Ferrite and austenitic ratio are about 1: 1.
2, with analytical reagent and first water configuration 0.5mol/LNa
2SO
4Alternating voltage passivation solution.The duplex stainless steel sample is polished to 2000# with sand paper is from coarse to fine, and polishing powder is polished to minute surface, uses ethanol and washed with de-ionized water again, dries up in the back immigration passivating solution to carry out alternating voltage passivation, and current potential square wave parameter is: positive half cycle current potential E
h=1225mV, negative half period current potential E
1=-700mV, frequency f=30Hz, dutycycle k=70%, passivation time t=30min, temperature is a normal temperature.
3, SEM observes passivation rear surface pattern, and EDS goes up the element distribution mutually with γ mutually to α respectively and compares analysis.
4, select 0.4mol/LNaCl+0.25mol/LH for use
2SO
4Solution is tested media, relatively electrokinetic potential polarization curve, electrochemical impedance spectroscopy and the Mott-Schottky curve of unpassivated, the duplex stainless steel handled through the direct current passivation and through alternating voltage passivation.
Experimental result shows that after alternating voltage passivation was handled, the duplex stainless steel sample showed unique surface topography; α phase and γ Cr content increase mutually in the certain depth scope of surface, Fe content reduces, and illustrates that two-phase all obtains passivation; The electrokinetic potential polarization curve is tieed up blunt electric current and has been reduced about 1.5 orders of magnitude; Electrochemical impedance spectroscopy simulates that membrane resistance behind the alternating voltage passivation is far longer than unpassivated and through the direct current Passivation Treatment; From the Mott-Schottky curve also as can be seen, duplex stainless steel surface passivated membrane carrier density obviously reduces, and illustrates that solidity to corrosion is improved significantly.In sum, the duplex stainless steel corrosion resistance nature after alternating voltage passivation is handled is far superior to the duplex stainless steel without the alternating voltage passivation processing.
Claims (2)
1. the Wave carrier passivating treatment method of a duplex stainless steel is characterized in that: with 0.5mol/LNa
2SO
4Be alternating voltage passivation solution, under following current potential square wave parameter, the two-phase Stainless Steel carried out alternating voltage passivation and handle: positive half cycle current potential E
h=1225mV, negative half period current potential E
1=-700mV, frequency f=30Hz, dutycycle k=70%, passivation time t=30min, temperature is a normal temperature.
2. the Wave carrier passivating treatment method of duplex stainless steel according to claim 1, it is characterized in that: duplex stainless steel is polished to 2000# with sand paper is from coarse to fine earlier, polishing powder is polished to minute surface, uses ethanol and washed with de-ionized water again, enters after drying up to carry out alternating voltage passivation in the passivating solution again.
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| CN108344679A (en) * | 2018-01-18 | 2018-07-31 | 北京科技大学 | A method of characterization cast austenitic-ferritic stainless steel pitting corrosion |
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Assignee: Hua Feng marine heavy anti-corrosion New Material Co. Ltd. Assignor: Harbin Engineering Univ. Contract record no.: 2012320000277 Denomination of invention: Wave carrier passivating treatment method of diphasic stainless steel Granted publication date: 20101201 License type: Exclusive License Open date: 20080820 Record date: 20120322 |
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Granted publication date: 20101201 Termination date: 20170321 |
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