CN104568732A - Experimental device and testing method for rapidly determining corrosion rate of reinforcing steel bars - Google Patents
Experimental device and testing method for rapidly determining corrosion rate of reinforcing steel bars Download PDFInfo
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Abstract
The invention discloses an experimental device and a testing method for rapidly determining the corrosion rate of reinforcing steel bars. The method comprises the following steps: I, preparing a test sample; II, preparing a solution; III, establishing a device; IV, installing the test sample; and V, testing the test sample. The invention provides an experimental device and a testing method for rapidly determining corrosion rate of reinforcing steel bars by adopting a macro battery, no gap corrosion of the test sample in testing can be guaranteed, the experimental testing accuracy is high, the consistent testing results can be shown by performing electrochemical linear polarization testing to the reinforcing steel bars and service environment sample feeding testing to reinforcing steel concrete test samples, and the efficiency of the testing method can be effectively proven.
Description
Technical field
The present invention relates to a kind of method measuring reinforcement corrosion speed, specifically a kind of method of Fast Measurement concrete reinforcing bars corrosion rate, belong to the corrosive nature detection method technical field of metal material.
Background technology
Reinforcing bar has been widely used in xoncrete structure building as building materials.Reinforced concrete structure does not often reach Years Of Service just to be destroyed in advance, and reason is that reinforcing bar there occurs corrosion, and the corrosion product of accumulation makes concrete produce internal stress and ftracture, so the corrosive nature evaluating reinforcing bar is extremely important.Corrosion rate is one of important parameter characterizing reinforcement corrosion performance.Measure the usual weight-loss method of corrosion rate, but when the effect of sample and surrounding medium shows as passivation system, the corrosion loss amount of sample is less, limit by balance range, weight-loss method is often inadvisable, often adopts electrochemical process, by testing the current density of electrochemical reaction, be converted into corrosion rate, as macro cell current method.
Macro cell current method is exactly connect a resistance between the anode and negative electrode of corrosion galvanic cell, by testing the corrosion current that this ohmically voltage comes in counter circuit.Test for macro cell method loop current, Chinese patent 201120053871.1 refer to a kind of current level measurement mechanism of macro cell, this device can in metering circuit microampere order corrosion current so that lower experimental error, improve experiment accuracy (Geng Chunlei. a kind of current level measurement mechanism [P] of macro cell. Chinese patent, 201120053871.1.2011-03-03).At present, also some standardized macro cell corrosion method of testings are had, 2 kinds of macro cell methods of testing (ASTM A955/A955M-09a, Standard Specification for Deformed and Plain Stainless-Steel Bars for Concrete Reinforcement.) are provided in annex as ASTM A955/A955M-12.Two kinds of methods have been connected the resistance of one 10 ohm all between a cathode and an anode, the voltage in sense voltage table test resistance is adopted to calculate corrosion current, the negative electrode of first method and the loop of anode are made up of concrete simulated solution and salt bridge, and the negative electrode of second method and the loop of anode are made up of concrete.When adopting first method test reinforcing bar sample, sample corrosion sites multidigit is in sample bottom end, namely sample there occurs crevice corrosion, in addition at the position that sample, concrete simulated solution contact with air three, also be the multiple district of corrosion, and from experimental principle, wishing that corrosion occurs in is immersed on the rebar surface of below solution, so test result can not react the true corrosion condition of reinforcing bar.Second method adopts reinforced concrete soil sample, and sample is prepared loaded down with trivial details, complicated operation.In addition, ASTM G109-2007 define with the annex of ASTM A955/A955M-12 in provide the similar method of the second macro cell method of testing, but the resistance of connecting between negative electrode and anode is 100 ohm, there is sample and prepare loaded down with trivial details in this same standard, feature (the ASTM G109-2007 of complicated operation, Standard Test Method for Determining Effects of Chemical Admixtures on Corrosion of Embedded Steel Reinforcement in Concrete Exposed to Chloride Environments.).
Macro cell current method is one of important method evaluating reinforcement corrosion speed, but existing macro cell method is generally only applicable to the Evaluation of Corrosion Resistance of stainless steel rebar, and the applicability of the low-alloyed reinforcing bar of centering is still not clear.And the shortcomings such as it is long to there is the test period, and sample production is loaded down with trivial details, complicated operation.
Summary of the invention
In view of the defect that above-mentioned prior art exists, the object of the invention is a kind of method proposing Fast Measurement reinforcement corrosion speed, there is reinforcing bar sample when solving the corrosion rate measuring low-alloy steel bar and easily crevice corrosion occurs, experiment test precision is low, the problem of experimental results validity difference.
Object of the present invention, will be achieved by the following technical programs: a kind of method of Fast Measurement reinforcement corrosion speed, comprises the following steps:
I, prepare sample: select bar-shaped reinforcing bar sample, one end wire bonds of described reinforcing bar, the Surface coating of described wire has insulation protective jacket, by the end of reinforcing bar and wire epoxy sealing;
II, obtain solution: adopt conductivity to be less than the deionized water obtain solution of 2 μ s/cm, and prepare anode concrete simulated solution and negative electrode concrete simulated solution;
III, build device: experimental provision is divided into anode reaction groove and cathode reaction groove, in anode reaction groove, place anode concrete simulated solution, in cathode reaction groove, place negative electrode concrete simulated solution; Be connected by salt bridge between anode reaction groove with cathode reaction groove, and the salt bridge connected, anode reaction groove and cathode reaction groove are inserted in thermostat;
IV, sample is installed: all immersed by sample in the solution in reactive tank; Form negative electrode by least two samples and negative electrode concrete simulated solution, form anode by a reinforcing bar sample and anode concrete simulated solution, and the resistance of 100 Ω that connect between a cathode and an anode; And control test solution temperature constant by thermostat;
V, test sample: after installing, starts to test, and the test duration is 8 weeks, and regularly replaces solution and salt bridge, according to voltage transitions corrosion rate (μm/a) formula: corrosion rate=11.6
i c=11600V/ (AR), wherein:
i c: corrosion electric current density (μ A/cm
2), the voltage drop (mV) on V:100 Ohmage, A: the area (cm that anode reinforcing bar is exposed
2), R: resistance (Ω), obtains the corrosion rate graph of a relation over time of sample in negative electrode and positive electrode.
Further, the method for aforesaid Fast Measurement reinforcement corrosion speed, the anode concrete simulated solution in step II is be the aqua calcis of 0 ~ 15% sodium chloride containing massfraction, and negative electrode concrete simulated solution is saturated aqua calcis.The deionized water object that the solution of preparation adopts conductivity to be less than 2 μ s/cm is to make solution purity, in order to avoid introduce other impurity effects; Anode concrete simulated solution is the aqua calcis of the sodium chloride being 0 ~ 15% containing massfraction, and to simulate the sodium chloride content in varying environment, the sodium chloride content in actual concrete pore solutions may exist hardly more than 15%.
Further, the method for aforesaid Fast Measurement reinforcement corrosion speed, the salt bridge in step III comprises a glass tube taken the shape of the letter U, and is filled with gel in described glass tube, and gel component is agar, potassium chloride and distilled water, and its mass ratio is 9:60:200.Be diffused in contrast electrode to prevent the harmful ion in solution and affect its electrode potential in salt bridge solution.
Further, the method for aforesaid Fast Measurement reinforcement corrosion speed, remains on 25 DEG C by the temperature of thermostat control concrete simulated solution in step IV; And draft tube is provided with in cathodic area, long logical oxygen in described draft tube, logical amount of oxygen is 100mL/min.The temperature controlling concrete simulated solution by thermostat is 25 DEG C and is convenient to test system and is in constant environment, eliminates the impact of temperature on experiment; It is 100mL/min that cathodic area leads to amount of oxygen, adopts definite value to lead to oxygen, is convenient to cathode reaction.
Further, the method for aforesaid Fast Measurement reinforcement corrosion speed, test solution is changed weekly once, and salt bridge is changed once for every 3 days; Go bad to prevent solution and salt bridge filler.
The present invention, its outstanding effect is: a kind of experimental provision and method of testing adopting macro cell Fast Measurement reinforcement corrosion speed provided by the invention, when can ensure test, there is not crevice corrosion in sample, experiment test precision is high, throw sample test by the Service Environment of reinforcing bar being carried out to the test of electrochemistry linear polarization method and reinforced concrete soil sample and show that test result has consistance, effectively demonstrate the validity of this test method.
Below just accompanying drawing in conjunction with the embodiments, is described in further detail the specific embodiment of the present invention, is easier to understand, grasp to make technical solution of the present invention.
Accompanying drawing explanation
Fig. 1 is reinforcing bar sample structural representation of the present invention.
Fig. 2 is the structural representation of experimental provision of the present invention.
Fig. 3 is the corrosion rate variation relation figure in time of the present invention's two kinds of reinforcing bars (removal scale on surface).
Fig. 4 is the present invention two kinds of reinforcing bar (not removing scale on surface) corrosion rate variation relation figure in time.
Embodiment
Embodiment 1
First sample is prepared: make sample according to Fig. 1; 1# and 2# of φ 16 × 125mm is selected to remove the bar-shaped reinforcing bar sample of scale on surface; one end wire 2 of reinforcing bar 1 welds; the Surface coating of wire has insulation protective jacket simultaneously; the end of reinforcing bar and wire epoxy resin 3 are sealed, and the exposed length of reinforcing bar is 100mm.
Secondly obtain solution: adopt conductivity to be less than the deionized water obtain solution of 2 μ s/cm, and prepare anode concrete simulated solution and negative electrode concrete simulated solution, this anode concrete simulated solution is be the aqua calcis of 0 ~ 15% sodium chloride containing massfraction, and negative electrode concrete simulated solution is saturated aqua calcis.
Build device and sample is installed: building experimental provision according to Fig. 2, comprise the symmetrically arranged anode mechanism for testing of the right and left, cathode test mechanism, current testing device and thermostat, wherein, be connected by salt bridge 4 between anode mechanism for testing and cathode test mechanism, salt bridge comprises salt bridge glass tube, the surface of salt bridge glass tube upwards extends to form upper riser, upper riser is provided with filling opening, the two ends, left and right of salt bridge glass tube extend to form lower side pipe downwards, and the end of lower side pipe is encapsulated by porous ceramics; This anode mechanism for testing comprises anode reaction groove 5, is marked with anodic dissolution 6 in anode reaction groove, and immersed with anode test specimens 7 in anodic dissolution, anode reaction groove is provided with anode reaction groove end cap 8; Cathode test mechanism comprises cathode reaction groove 9, cathode solution 10 is marked with in cathode reaction groove, immersed with cathode test sample 11 in cathode solution, cathode reaction groove is provided with cathode reaction groove end cap 12, and cathode reaction groove end cap is provided with perforate, is connected with oxygen generator in perforate, in this salt bridge glass tube, be filled with gel, gel component is agar, potassium chloride and distilled water, and its mass ratio is 9:60:200; The salt bridge connected, anode reaction groove and cathode reaction groove are inserted in thermostat.
Afterwards, sample is all immersed in the solution in reactive tank; Form negative electrode by two samples and negative electrode concrete simulated solution, form anode by a reinforcing bar sample and anode concrete simulated solution, and the resistance of 100 Ω that connect between a cathode and an anode; The temperature being controlled concrete simulated solution by thermostat remains on 25 DEG C; Meanwhile, be provided with draft tube 13 in cathodic area, long logical oxygen in this draft tube, logical amount of oxygen is 100mL/min.
After installing, start to test, the test duration is 8 weeks, within every 1 week, changes a test solution, within every 3 days, changes a salt bridge.After test starts, in the first week, every other day record primary voltage meter reading, after this, every week record single reading.And according to voltage transitions corrosion rate (μm/a) formula: corrosion rate=11.6
i c=11600V/ (AR), wherein:
i c: corrosion electric current density (μ A/cm
2), the voltage drop (mV) on V:100 Ohmage, A: the area (cm that anode reinforcing bar is exposed
2), R: resistance (Ω), obtains the corrosion rate graph of a relation over time removing scale on surface sample in negative electrode and positive electrode, as shown in Figure 3.
Embodiment 2
First sample is prepared: make sample according to Fig. 1; 1# and 2# of φ 11.3 × 125mm is selected not remove the bar-shaped reinforcing bar sample of scale on surface; one end wire 2 of reinforcing bar 1 welds; the Surface coating of wire has insulation protective jacket simultaneously; the end of reinforcing bar and wire epoxy resin 3 are sealed, and the exposed length of reinforcing bar is 60mm.
Secondly obtain solution: adopt conductivity to be less than the deionized water obtain solution of 2 μ s/cm, and prepare anode concrete simulated solution and negative electrode concrete simulated solution, this anode concrete simulated solution is be the aqua calcis of 0 ~ 15% sodium chloride containing massfraction, and negative electrode concrete simulated solution is saturated aqua calcis.
Build device and sample is installed: building experimental provision according to Fig. 2, comprise the symmetrically arranged anode mechanism for testing of the right and left, cathode test mechanism, current testing device and thermostat, wherein, be connected by salt bridge between anode mechanism for testing and cathode test mechanism, salt bridge comprises salt bridge glass tube, the surface of salt bridge glass tube upwards extends to form upper riser, upper riser is provided with filling opening, the two ends, left and right of salt bridge glass tube extend to form lower side pipe downwards, and the end of lower side pipe is encapsulated by porous ceramics; This anode mechanism for testing comprises anode reaction groove, is marked with anodic dissolution in anode reaction groove, and immersed with anode test specimens in anodic dissolution, anode reaction groove is provided with anode reaction groove end cap; Cathode test mechanism comprises cathode reaction groove, cathode solution is marked with in cathode reaction groove, immersed with cathode test sample in cathode solution, cathode reaction groove is provided with cathode reaction groove end cap, and cathode reaction groove end cap is provided with perforate, is connected with oxygen generator in perforate, in this salt bridge glass tube, be filled with gel, gel component is agar, potassium chloride and distilled water, and its mass ratio is 9:60:200; The salt bridge connected, anode reaction groove and cathode reaction groove are inserted in thermostat.
Afterwards, sample is all immersed in the solution in reactive tank; Form negative electrode by two samples and negative electrode concrete simulated solution, form anode by a reinforcing bar sample and anode concrete simulated solution, and the resistance of 100 Ω that connect between a cathode and an anode; The temperature being controlled concrete simulated solution by thermostat remains on 25 DEG C; Meanwhile, in cathodic area, be provided with draft tube, long logical oxygen in this draft tube, logical amount of oxygen is 100mL/min.
After installing, start to test, the test duration is 8 weeks, within every 1 week, changes a test solution, within every 3 days, changes a salt bridge.After test starts, in the first week, every other day record primary voltage meter reading, after this, every week record single reading.And according to voltage transitions corrosion rate (μm/a) formula: corrosion rate=11.6
i c=11600V/ (AR), wherein:
i c: corrosion electric current density (μ A/cm
2), the voltage drop (mV) on V:100 Ohmage, A: the area (cm that anode reinforcing bar is exposed
2), R: resistance (Ω), obtains the corrosion rate graph of a relation over time removing scale on surface sample in negative electrode and positive electrode, as shown in Figure 4.
Claims (6)
1. the experimental provision of a Fast Measurement reinforcement corrosion speed, it is characterized in that: comprise the symmetrically arranged anode mechanism for testing of the right and left, cathode test mechanism, current testing device and thermostat, be connected by salt bridge between described anode mechanism for testing and cathode test mechanism; Described anode mechanism for testing comprises anode reaction groove, is marked with anodic dissolution in described anode reaction groove, and immersed with anode test specimens in described anodic dissolution, described anode reaction groove is provided with anode reaction groove end cap; Described cathode test mechanism comprises cathode reaction groove, cathode solution is marked with in described cathode reaction groove, immersed with cathode test sample in described cathode solution, described cathode reaction groove is provided with cathode reaction groove end cap, and cathode reaction groove end cap is provided with perforate, is connected with oxygen generator in described perforate; Described current testing device comprises resistance and voltage table, and described resistance is connected with anode test specimens and cathode test sample respectively by wire, forms primary element circuit loop, voltage table be connected in parallel on resistance two ends.
2. the method for a kind of Fast Measurement reinforcement corrosion speed according to claim 1, is characterized in that: comprise the following steps:
I, prepare sample: select bar-shaped reinforcing bar sample, one end wire bonds of described reinforcing bar, the Surface coating of described wire has insulation protective jacket, by the end of reinforcing bar and wire epoxy sealing;
II, obtain solution: adopt conductivity to be less than the deionized water obtain solution of 2 μ s/cm, and prepare anode concrete simulated solution and negative electrode concrete simulated solution;
III, device is built: the experimental provision building described Fast Measurement reinforcement corrosion speed;
IV, sample is installed: all immersed by sample in the solution in reactive tank; Form negative electrode by least two samples and negative electrode concrete simulated solution, form anode by a reinforcing bar sample and anode concrete simulated solution, and the resistance of 100 Ω that connect between a cathode and an anode; And control test solution temperature constant by thermostat;
V, test sample: after installing, starts to test, and the test duration is 8 weeks, and regularly replaces solution and salt bridge, according to voltage transitions corrosion rate (μm/a) formula: corrosion rate=11.6
i c=11600V/ (AR), wherein:
i c: corrosion electric current density (μ A/cm
2), the voltage drop (mV) on V:100 Ohmage, A: the area (cm that anode reinforcing bar is exposed
2), R: resistance (Ω), obtains the corrosion rate graph of a relation over time of sample in negative electrode and positive electrode.
3. the method for Fast Measurement reinforcement corrosion speed according to claim 1, it is characterized in that: the anode concrete simulated solution in described step II is be the aqua calcis of 0 ~ 15% sodium chloride containing massfraction, and negative electrode concrete simulated solution is saturated aqua calcis.
4. the method for Fast Measurement reinforcement corrosion speed according to claim 1, it is characterized in that: be filled with gel in the salt bridge glass tube in described step III, gel component is agar, potassium chloride and distilled water, and its mass ratio is 9:60:200.
5. the method for Fast Measurement reinforcement corrosion speed according to claim 1, is characterized in that: remain on 25 DEG C by the temperature of thermostat control concrete simulated solution in described step IV; And draft tube is provided with in cathodic area, long logical oxygen in described draft tube, logical amount of oxygen is 100mL/min.
6. the method for Fast Measurement reinforcement corrosion speed according to claim 1, is characterized in that: described test solution is changed weekly once, and salt bridge is changed once for every 3 days.
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