CN105628562A - Water tank antirot material dissolvent characteristic detection test method - Google Patents
Water tank antirot material dissolvent characteristic detection test method Download PDFInfo
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Abstract
The invention provides a water tank antirot material dissolvent characteristic detection test method, comprising the following steps: sample pretreatment: taking an antirot coating sample, weighing, and obtaining the size; initial dissolvent: soaking the sample in test water, sampling at a soaking time interval of 1 to 3 days in the first 15 soaking days, then sampling for 3 to 5 times at an interval of 3 to 5 days, and then sampling at an interval of 10 to 15 days, and detecting concentration of dissolved total organic carbon each time; deep dissolvent: talking out a test block, soaking in the test water again, taking a soak solvent at an interval of 1 to 3 days in the first 15 soaking days for detection, then sampling for 3 to 5 times at an interval of 3 to 5 days, detecting concentration Cs of dissolved total organic carbon each time, and when the soak solvent is taken for the last time, detecting other ion concentrations; data processing: performing analytical processing on a detection result of a dissolved matter, and respectively calculating dissolvent rates of total organic carbon of the test block in the initial dissolvent stage and the deep dissolvent stage, thus obtaining water tank antirot material dissolvent characteristics.
Description
Technical field
The present invention relates to water treatment field, specifically, relate to a kind of water tank anti-corrosion material dissolution characteristic detection test method.
Background technology
Steam power plant's sweet-water tank needs at internal coat anti-corrosion material, and anti-corrosion material is generally SPUA, is a kind of macromolecular material. Water tank is at the initial stage of coating anti-corrosion material, it may appear that the situation of sweet-water tank overproof water quality, can have a strong impact on unit normal water supply. It is likely to relevant with tank inner wall anticorrosion material dissolution through investigation and analysis. About SPUA, the existing relevant unit of impact of power plant's sweet-water tank water quality is carried out experimentation at present, formulate testing program.
The impact of water quality has been carried out experimental study for power plant's sweet-water tank inwall polyurea anti-corrosion coating by the Feng Jinling etc. of three nuclear power company limiteies. In this test, the soak period of test piece is 7 days, and detection project is the anions and canons in water and total organic carbon (TOC). Testing result is each ionic impurity < 1.0 �� g/L, TOC < 50 �� g/L. Conclusion (of pressure testing) is that SPUA is used as power plant's sweet-water tank its leachable of inner wall anti-corrosive material power plant's desalination water quality initial stage is had minimal effect, flushing and immersion along with system, and the prolongation of the time of operation, the demineralized water water supply quality of power plant normally, is not reconstructed impact by each water quality index behind 3��4 months subsequently.
The program can only explain the influence degree to roof tank water quality, but for saying in investigating polyurea anti-corrosion coating stripping law in demineralized water, the program can not reflect the dissolution characteristic of coating material. Additionally, the program stress be analyze the coating dissolution influence degree to roof tank water quality, if to investigate corrosion-inhibiting coating dissolution characteristic in demineralized water, this testing program lack integrity, also without investigate coating dissolution characteristic rule.
The Dong Yiling of China Nuclear Power Engineering Co., Ltd. etc. have carried out experimental study for the selection of anti-corrosion material in red nuclear power along the river phase conventional island meta-alkalescence demineralized water storage tank. In this test, the pure polyureas test piece (being numbered A, B, C) of import that different manufacturers is provided is tested, test piece specification is 10mm �� 100mm, and each test piece is soaked with the high purity water of 500mL respectively, and the longest soak time is 15d, every 3d carries out a leachable test, do blank assay simultaneously, test front high purity water and test piece is rinsed well, test and analysis process avoids external contamination, carrying out under the isoperibol of 25 DEG C, test certainty of measurement is less than 1 �� g/L. Result of the test shows, during the test of 15d, and heavy metal free Ion release, Na+��F-And Cl-Mass concentration be respectively less than 0.5 �� g/L, SO4 2-Mass concentration lower than 2 �� g/L. The SER water tank effluent quality spraying pure polyurea anti-corrosion coating meets nuclear island, each user's requirement of conventional island. To dampness, temperature-insensitive, and its cost is relatively low, and other can use for reference this experience building nuclear power station.
The program has only investigated the anions and canons level of coating dissolution, and it can not for investigating the technical contribution that corrosion-inhibiting coating dissolution characteristic in demineralized water provides any.
In view of the foregoing, the special proposition present invention.
Summary of the invention
It is an object of the present invention to provide a kind of water tank anti-corrosion material dissolution characteristic detection test method, the inventive method mainly through to being soaked with in the test fluid of anti-corrosion material test piece total organic carbon (TOC), the analysis detection of anions and canons and the material such as soluble silicon, ferrum, the extractum level of comprehensive descision anti-corrosion material, analyzes its pollution level to demineralized water.
For reaching above-mentioned purpose, on the one hand, the invention provides a kind of water tank anti-corrosion material dissolution characteristic detection test method wherein, described method at least includes arranging battery of tests group, including:
(1) sample pretreatment: take corrosion-inhibiting coating sample, weigh after cleaning-drying (quality: m gram), to measure specimen size (long �� wide �� high: l �� w �� h);
(2) initial stage dissolution: the sample after weighing is immersed in the test water congruent with the aqueous phase in water tank, record initial volume, then start at day to soak, initial 15 soak and in a few days sample detection with the soak time interval of 1 to 3 day, then detection 3 to 5 times is sampled with the soak time interval of 3 to 5 days, sampling detection with the soak time interval of 10 to 15 days, detection is the organic carbon concentration of detection dissolution every time later, and the dissolution stage at initial stage is 1-4 month; After every sub-sampling, equal complementary testing water is to initial volume;
(3) degree of depth dissolution: after the stage of dissolution in the early stage terminates, test piece is taken out from sample bottle, again it is immersed in new test water, record initial volume, start at day to soak, initial 15 soak in a few days interval and within 1 to 3 day, take soak detection successively, then detection 3 to 5 times is sampled with the soak time interval of 3 to 5 days, detection is the concentration C of the total organic carbon of detection dissolution every time, and other ion concentrations simultaneously detecting in test water when taking soak detection organic carbon concentration the last time, the degree of depth dissolution stage is 25-40 days; After every sub-sampling, equal complementary testing water is to initial volume;
(4) data process: the testing result that step (2) and step (3) detect leachable is analyzed processing, calculate the total organic carbon dissolution rate of the test piece in dissolution stage at initial stage and degree of depth dissolution stage respectively, obtain water tank anti-corrosion material dissolution characteristic.
According to some specific embodiments of the present invention, wherein, the water in water tank is demineralized water;
Preferred described demineralized water composition includes: total organic carbon (TOC) content is less than 50 �� g/L, activity SiO2Less than 5.0 �� g/L, Na+Less than 1.0 �� g/L and Cl-Less than 1.0 �� g/L;
It is also preferred that demineralized water pH is 6.0��7.0;
It is also preferred that demineralized water electrical conductivity is less than 0.2 �� S/cm.
According to some specific embodiments of the present invention, wherein, in step (1), the selection principle of test piece size is: consider two factors of inspection range of the detection method of test piece specific surface area and test piece leachable;
Specific surface area (the S of test pieceS) should more than the specific surface area (S of actual water tankv);
The big I of test piece ensures that the concentration of the material of institute's dissolution is within the inspection range of detection method used, and ensures accuracy and the reliability of test data;
Generally, the specific surface area of test piece is within the scope of the specific surface area 10 to 50 times of water tank, can meet test requirements document.
The present invention is as follows to the definition of test piece specific surface area: the ratio of the maximum area that test piece contacts with water and the volume of water.
According to some specific embodiments of the present invention, wherein, step (2), (3) described test water are the grade II desalted water the taking from power plant ultra-pure water through high purity water instrument purified treatment, and its composition keeps consistent with the composition of the demineralized water in power plant sweet-water tank.
Due to after taking test water from water tank, may by container and environmental pollution in the process of transhipment, therefore in order to ensure the accuracy of detection, step of the present invention (2), (3) described test water are soaking before test piece also through high purity water instrument purified treatment, so that its composition is consistent with the composition of the demineralized water in power plant sweet-water tank;
Described high purity water instrument is equipment commonly used in the art.
According to some specific embodiments of the present invention, wherein, step (3) other ions described include one or more in chloride ion, sulfate ion, soluble silicon, sodium ion, calcium ions and magnesium ions and iron content.
According to some specific embodiments of the present invention, wherein, the calculating of the total organic carbon dissolution rate of test piece is included by step (4):
1) with soak time be abscissa, with the dissolution concentration of total organic carbon for vertical coordinate, do the test piece total organic carbon dissolution concentration change curve with soak time in dissolution stage at initial stage and degree of depth dissolution stage respectively, and judge test piece dissolution type;
2) total organic carbon dissolution rate is calculated:
A) described test piece dissolution type is equilibrated type:
Dissolution initial stage, dissolution rate stage is:
Wherein,
vco: the total organic carbon dissolution rate in dissolution stage at equilibrated type test piece initial stage, unit is: �� g/ (cm2D);
C1��C3��������Co-1: take the total organic carbon dissolution concentration that soak records, unit: mg/L before reaching dissolution balance for the equilibrated type test piece stage of dissolution in the early stage every time;
VtFor taking sampling amount during soak every time, unit: L;
VpFor soaking the cumulative volume of the test water of test piece, unit: L;
CoTotal organic carbon dissolution for test piece reaches organic carbon concentration when balancing, unit: mg/L;
S is that strip amasss;
TcoReaching, from starting to be dipped into total organic carbon dissolution concentration, the soak time that balance is required for test piece, unit is: sky (d);
Degree of depth dissolution stage dissolution rate is:
Wherein,
VS: the epacmastic total organic carbon dissolution rate of equilibrated type test piece, unit is: �� g/ (cm2D);
C1��C3��������Cn-1��Cn: within the entire depth dissolution stage, take the total organic carbon dissolution concentration that soak records, unit: mg/L for equilibrated type test piece every time;
TpFor test piece soak time, unit is: sky (d);
Or
B) described test piece dissolution type is growth form:
The dissolution rate in dissolution stage at initial stage and degree of depth dissolution stage is:
Wherein,
vc: growth form test piece TOC dissolution rate, unit is: �� g/ (cm2D);
C1��C3��������Cn-1��Cn: the TOC dissolution concentration recorded in whole test soak period for growth form test piece, unit: mg/L
TpFor test piece soak time, unit is: sky (d).
Equilibrated type test piece TOC dissolution in soak period of present invention definition reaches balance and refers to that TOC dissolution rate is less than or equal to 0.5 �� g/ (cm2��d)��
According to some specific embodiments of the present invention, wherein, the degree of depth dissolution of step (3) repeats 1��2 time.
According to some specific embodiments of the present invention, wherein, often group test group arranges two samples; Preferably include two test group.
According to some specific embodiments of the present invention, wherein, also setting up a blank assay group, described blank assay group and test group are distinctive in that does not place sample.
According to some specific embodiments of the present invention, wherein, the ultra-pure water consumption of the test water of initial stage dissolution and degree of depth dissolution each respectively 500ml.
According to some specific embodiments of the present invention, wherein, specimen preparation method: according to corrosion-inhibiting coating sample sample size, sample is cut into the test piece of wide 10mm, test piece length is according to sample size, within the scope of 50��100mm, 4 pieces of same size are processed in every kind of anti-corrosion material test piece, accurately measure each specimen size with slide gauge and make a record.
According to some specific embodiments of the present invention, wherein, first strip is carried out after making by experiment test piece. Dip in pure water with cotton balls surface is cleaned, remove the obvious dirt in surface, in beaker, then repeatedly change water soaking, slight wiping, it is ensured that test piece thoroughly cleans up. Finally it is placed in clean pallet and dries, weigh.
This testing program is divided into two stages: dissolution stage at initial stage and degree of depth dissolution stage.
The dissolution stage at initial stage: this stage test piece is immersed in certain volume soak, at the first month of whole soak period, 1 day, 2 days, 3 days, 5 days, 7 days, 10 days, 15 days, interval successively, sampling and testing leachable, then survey once every sampling in 10��15 days. What the dissolution stage at initial stage was investigated is test piece chemistry dissolution characteristic, and soak period is generally 1��4 month.
In the degree of depth dissolution stage: combine the operation characteristic of the on-the-spot uninterrupted water filling of sweet-water tank, water supply, again soaked by the test piece ultra-pure water used by initial stage dissolution step-by-step test, carry out the degree of depth dissolution experiment of test piece, to investigate test piece degree of depth dissolution feature. Degree of depth dissolution experiment can be carried out 1 to 3 time depending on test piece dissolution situation.
(1) test piece initial stage dissolution step-by-step test method
Predominantly detect project: TOC
1) taking 3 sample bottles, wherein 1 is blank test solution bottles, and other 2 is parallel sample test solution bottles,
Each sample bottle is encoded.
2) in three sample bottles, quantitatively load 500mL ultra-pure water, measure three sample background valuess.
3) preparation of anti-corrosion material test piece leachable soak: 4 test pieces that will handle well, is respectively put into after rinsing well with high purity water in two parallel sample bottles, covers bottle cap by two one group.
4) Changing Pattern according to 3 soak leachable TOC test values, it is determined that during the test of TOC
Between interval, initial stage test interval respectively 1 day, 3 days, 5 days, 7 days, determine the test interval in later stage and total soak time according to measured value growth trend.
5) for avoiding introducing external contamination in test process, do blank assay every time all simultaneously.
(2) test piece degree of depth dissolution TOC detection method
Test piece ultra-pure water used by initial stage dissolution step-by-step test is soaked again, at different soak time measuring space soak TOC content. Degree of depth dissolution experiment can be carried out 1 to 3 time depending on test piece dissolution situation, i.e. replaceable 1 to 3 time of test piece soak, operational approach is the same.
2.3.4.2 anti-corrosion material leachable zwitterion detection
Take appropriate soak, do zwitterion content analysis test in soak.
2.3.4.3 anti-corrosion material leachable silicon, iron content detect
Take appropriate soak, do silicon in soak, iron content analysis test.
In sum, the invention provides a kind of water tank anti-corrosion material dissolution characteristic detection test method. The method of the present invention has the advantage that
The present invention designs a kind of testing program for power plant's sweet-water tank inner wall anti-corrosive material dissolution characteristic research, this project establishes power plant's sweet-water tank corrosion-inhibiting coating leachable detection test method, each factor that the material of the factor that may interfere with this testing inspection result such as test piece immersion water background, immersion container and dissolution, the sealing of container, experimental situation etc. affect coating test piece leachable accuracy of measurement has carried out the effects, it is ensured that analyze reliability and the accuracy of testing result. on this basis, system, investigate multiple producer all sidedly, unlike material corrosion-inhibiting coating dissolution characteristic in demineralized water, multiple producers unlike material corrosion-inhibiting coating TOC dissolution Changing Pattern and dissolution rate in demineralized water are drawn, determine each corrosion-inhibiting coating TOC dissolution influence degree to water tank demineralized water TOC content quantitatively, adopt an effective measure for power plant's sweet-water tank initial operation stage and reduce because the impact of water quality is provided quantitative guidance foundation by coating TOC dissolution, the control requirement of generating set water and steam quality is met to being effectively ensured sweet-water tank water supply quality, there is important Research Significance and practical value.
Accompanying drawing explanation
Fig. 1 is the domestic polyureas sample initial stage dissolution stage TOC dissolution concentration curve figure of embodiment 1;
Fig. 2 is the domestic polyureas sample depth dissolution stage TOC dissolution concentration curve figure of embodiment 1;
Fig. 3 is power plant's sweet-water tank polyurea anti-corrosion coating initial stage dissolution stage TOC dissolution change curve of embodiment 1;
Fig. 4 is power plant's sweet-water tank polyurea anti-corrosion profile depth dissolution stage TOC dissolution change curve of embodiment 1;
Fig. 5 is the import polyureas sample initial stage dissolution stage TOC dissolution concentration curve figure of embodiment 2;
Fig. 6 is the domestic polyurea anti-corrosion depth of material dissolution stage TOC dissolution concentration curve figure of embodiment 2.
Detailed description of the invention
The beneficial effect of the implementation process of the present invention and generation is described in detail, it is intended to help reader to be more fully understood that essence and the feature of the present invention, not as can the restriction of practical range to this case below by way of specific embodiment.
Embodiment 1
Beijing power plant domestic polyureas sample leachable TOC Analysis of test results
(1) experimental condition
No. 36 samples: size (mm): 77.62 �� 10.42 �� 1.58,77.65 �� 10.42 �� 1.53;
Quality (g): 2.6199, soak volume is 610mL, seals.
No. 37 samples: size (mm): 77.62 �� 10.42 �� 1.55,77.62 �� 10.43 �� 1.56;
Quality (g): 2.7738. Soak volume is 610mL, seals.
No. 38 is blank sample, and volume is 610mL, seals.
Test temperature: room temperature 21 DEG C.
(2) initial stage dissolution stage TOC Analysis of test results
Domestic polyureas sample initial stage dissolution stage TOC dissolution concentration measurement and Changing Pattern are as shown in Figure 1.
It will be seen from figure 1 that No. 36 consistent with the TOC measured value Changing Pattern of No. 37 two groups of parallel samples, dependency is fine, demonstrates the reliability of this experiment TOC analyzer used and assay method.
Can be seen that, under this experiment condition, import producer sample is in the initial stage dissolution soak period of 55 days, TOC dissolution concentration is within the scope of 0��20.0mg/L, dissolution increasing law divides two periods, being quick rise period and dissolution balance period respectively, quick rise period TOC dissolution concentration is notable growth trend, and dissolution balance period is the stabilization sub stage after reaching dissolution equilibrium concentration. It can be seen that it is 20 days that this polyureas sample reaches TOC dissolution equilibrium concentration required time in demineralized water.
2) degree of depth dissolution stage TOC Analysis of test results
Certain producer's polyureas sample depth dissolution stage TOC dissolution concentration measurement domestic and Changing Pattern are as shown in Figure 2. It can be seen that reach No. 36, No. 37 sample penetration depth dissolution experimental stages of initial stage TOC dissolution balance, still have a degree of TOC dissolution, but stripping quantity significantly reduces.
3) unit are TOC stripping quantity and dissolution rate analysis
According to the TOC dissolution concentration that the two above stage measures, unit are stripping quantity (the �� g/cm to certain producer's polyurea anti-corrosion coating sample two stage of No. 36 test pieces domestic2) calculated, result of calculation is in Table 1 and table 2.
No. 36 sample initial stage dissolution stage TOC stripping quantities of the domestic polyurea anti-corrosion coating of table 1 and dissolution rate
No. 36 sample depth dissolution stage TOC stripping quantities of the domestic polyurea anti-corrosion coating of table 2 and dissolution rate
3) Beijing power plant sweet-water tank polyurea anti-corrosion coating TOC dissolution impact analysis to sweet-water tank water quality
Table 3 Beijing Power Plant No.1 sweet-water tank basic parameter
Table 4800t sweet-water tank corrosion-inhibiting coating unit are stripping quantity controlling value
Table 3 and table 4 are 800 tons of water tank basic parameters of this power plant and corrosion-inhibiting coating unit are stripping quantity controlling value, can be seen that, as demineralized water TOC controlling value respectively 200 �� g/L, 100 �� g/L, 50 �� g/L in water tank, tank inner wall anticorrosion coating unit area TOC stripping quantity controlling value respectively 47.47 �� g/cm2��23.23��g/cm2With 11.61 �� g/cm2. By the residence Time Calculation of 7 days, dissolution rate is 6.78 �� g/ (cm respectively2��d)��3.39��g/(cm2D) He 1.70 �� g/ (cm2��d)��
The data of associative list 1 and table 2, this power plant's polyurea coating water tank TOC dissolution quick rise period (7 to 11 days) stripping quantity is relatively big, and dissolution rate is more than 200 �� g/L water outlet Con trolling index. After the quick rise period, TOC dissolution rate significantly reduces, less than 50 �� g/L water outlet Con trolling index. Thus inferring, this power plant's polyurea coating water tank runtime, the impact of water tank demineralized water TOC content is little, and its TOC dissolution contribution margin was less than demineralized water water supply index 50 �� g/L controlling value after the TOC dissolution quick rise period.
Beijing Power Plant No.1 sweet-water tank polyurea anti-corrosion coating is on the impact of TOC in water tank demineralized water as shown in Figure 3. It can be seen that in the one-month period of No. 1 water tank full water immersion, in case, demineralized water TOC rises to 4.5mg/L, and the quick rise period is 15 days, and then TOC content tends to balance.
No. 1 sweet-water tank in August 25 start to discharge water, rinse, at bath, sample analysis. TOC analyzes result as shown in Figure 4. It can be seen that after this water tank have passed through TOC dissolution balance period, after charging, TOC stripping quantity significantly reduces to 100 �� g/L, meets unit water supply requirement.
Embodiment 2: import producer polyureas sample leachable TOC Analysis of test results
(1) experimental condition
No. 1 sample: size (mm): 64.02 �� 10.20 �� 2.04,64.02 �� 10.08 �� 2.06;
Quality (g): 2.3907, soak volume is 610mL, seals.
No. 3 samples: size (mm): 64.02 �� 10.00 �� 2.08,64.02 �� 10.26 �� 2.06;
Quality (g): 2.4133. Soak volume is 610mL, seals.
No. 2 is blank sample, and volume is 610mL, seals.
Test temperature: room temperature 21 DEG C.
(2) initial stage dissolution stage TOC Analysis of test results
Import producer polyureas sample initial stage dissolution stage TOC dissolution concentration measurement and Changing Pattern are as shown in Figure 5.
From fig. 5, it can be seen that No. 1 consistent with the TOC measured value Changing Pattern of No. 3 two groups of parallel samples, dependency is fine, demonstrates the reliability of this experiment TOC analyzer used and assay method.
Can be seen that, under this experiment condition, certain producer's sample domestic is in the initial stage dissolution soak period of 80 days, TOC dissolution concentration is within the scope of 0��6.0mg/L, dissolution increasing law divides three periods, is quick rise period, transition period and dissolution balance period respectively, and quick rise period TOC dissolution concentration is notable growth trend, transition period is the slow rise period, and dissolution balance period is the stabilization sub stage after reaching dissolution equilibrium concentration. It can be seen that it is 60 days that A producer sample reaches TOC dissolution equilibrium concentration required time in demineralized water.
2) degree of depth dissolution stage TOC Analysis of test results
Certain producer's polyureas sample depth dissolution stage TOC dissolution concentration measurement domestic and Changing Pattern are as shown in Figure 6. It can be seen that reach No. 1, No. 3 sample penetration depth dissolution experimental stages of initial stage TOC dissolution balance, still have a degree of TOC dissolution, but stripping quantity significantly reduces.
3) unit are TOC stripping quantity and dissolution rate analysis
According to the TOC dissolution concentration that the two above stage measures, unit are stripping quantity (the �� g/cm to certain producer's polyurea anti-corrosion coating sample two stage of No. 1 test piece domestic2) calculated, result of calculation is in Table 5 and table 6.
No. 1 sample initial stage dissolution stage TOC stripping quantity of table 5 import polyurea anti-corrosion coating and dissolution rate
No. 1 sample depth dissolution stage TOC stripping quantity of table 6 import polyurea anti-corrosion coating and dissolution rate
If this Power Plant No.1 sweet-water tank adopts this import polyurea anti-corrosion coating, relatively big at TOC dissolution quick rise period (7 to 11 days) stripping quantity, dissolution rate is more than 100 �� g/L water outlet Con trolling index. After the quick rise period, TOC dissolution rate significantly reduces, less than 50 �� g/L water outlet Con trolling index. Thus inferring, this power plant's polyurea coating water tank runtime, the impact of water tank demineralized water TOC content is little, and its TOC dissolution contribution margin was less than demineralized water water supply index 50 �� g/L controlling value after the TOC dissolution quick rise period.
The detection of other index
In two embodiments, the anions and canons in sample soak and silicone content are detected, it is shown that two kinds of polyurea anti-corrosion coating test piece anions and canons stripping quantities in demineralized water are respectively less than 10 �� g/L, roof tank water quality impact is little.
Claims (10)
1. power plant's sweet-water tank anti-corrosion material dissolution characteristic detection test method, wherein, described method at least includes arranging battery of tests group, including:
(1) sample pretreatment: take corrosion-inhibiting coating sample, weighs after cleaning-drying, measures specimen size;
(2) initial stage dissolution: the sample after weighing is immersed in the test water congruent with the aqueous phase in water tank, record initial volume, then start at day to soak, initial 15 soak and in a few days sample detection with the soak time interval of 1 to 3 day, then detection 3 to 5 times is sampled with the soak time interval of 3 to 5 days, sampling detection with the soak time interval of 10 to 15 days, detection is the organic carbon concentration of detection dissolution every time later, and the dissolution stage at initial stage is 1-4 month; After every sub-sampling, equal complementary testing water is to initial volume;
(3) degree of depth dissolution: after the stage of dissolution in the early stage terminates, test piece is taken out from sample bottle, again it is immersed in new test water, record initial volume, start at day to soak, initial 15 soak in a few days interval and within 1 to 3 day, take soak detection successively, then detection 3 to 5 times is sampled with the soak time interval of 3 to 5 days, detection is the concentration C of the total organic carbon of detection dissolution every time, and other ion concentrations simultaneously detecting in test water when taking soak detection organic carbon concentration the last time, the degree of depth dissolution stage is 25-40 days; After every sub-sampling, equal complementary testing water is to initial volume;
(4) data processing method: the testing result that step (2) and step (3) detect leachable is analyzed processing, calculate the total organic carbon dissolution rate of the test piece in dissolution stage at initial stage and degree of depth dissolution stage respectively, obtain water tank anti-corrosion material dissolution characteristic.
2. method according to claim 1, wherein, the specific surface area of described test piece is the specific surface area 10 to 50 times of described power plant sweet-water tank.
3. method according to claim 1, wherein, the water in water tank is demineralized water; Described demineralized water composition includes: TOC is less than 50 �� g/L, activity SiO2Less than 5.0 �� g/L, Na+Less than 1.0 �� g/L and Cl-Less than 1.0 �� g/L; It is also preferred that demineralized water pH is 6.0��7.0; It is also preferred that demineralized water electrical conductivity is less than 0.2 �� S/cm.
4. method according to claim 1, wherein, step (2), (3) described test water are the grade II desalted water the taking from power plant ultra-pure water through laboratory high purity water instrument purified treatment, and its composition keeps consistent with the composition of the demineralized water in power plant sweet-water tank.
5. method according to claim 1, wherein, step (3) other ions described include one or more in chloride ion, sulfate ion, soluble silicon, sodium ion, calcium ions and magnesium ions and iron content.
6. method according to claim 1, wherein, the calculating of the total organic carbon dissolution rate of test piece is included by step (4):
1) with soak time be abscissa, with the dissolution concentration of total organic carbon for vertical coordinate, do the test piece total organic carbon dissolution concentration change curve with soak time in dissolution stage at initial stage and degree of depth dissolution stage respectively, and judge test piece dissolution type;
2) total organic carbon dissolution rate is calculated:
A) described test piece dissolution type is equilibrated type:
Dissolution initial stage, dissolution rate stage is:
Wherein,
vco: the total organic carbon dissolution rate in dissolution stage at equilibrated type test piece initial stage, unit is: �� g/ (cm2D);
C1��C3��������Co-1: take the total organic carbon dissolution concentration that soak records, unit: mg/L before reaching dissolution balance for the equilibrated type test piece stage of dissolution in the early stage every time;
VtFor taking sampling amount during soak every time, unit: L;
VpFor soaking the cumulative volume of the test water of test piece, unit: L;
CoTotal organic carbon dissolution for test piece reaches organic carbon concentration when balancing, unit: mg/L;
S is that strip amasss;
TcoReaching, from starting to be dipped into total organic carbon dissolution concentration, the soak time that balance is required for test piece, unit is: sky (d);
Degree of depth dissolution stage dissolution rate is:
Wherein,
VS: the epacmastic total organic carbon dissolution rate of equilibrated type test piece, unit is: �� g/ (cm2D);
C1��C3��������Cn-1��Cn: within the entire depth dissolution stage, take the total organic carbon dissolution concentration that soak records, unit: mg/L for equilibrated type test piece every time;
TpFor test piece soak time, unit is: sky (d);
Or
B) described test piece dissolution type is growth form:
The dissolution rate in dissolution stage at initial stage and degree of depth dissolution stage is:
Wherein,
vc: growth form test piece TOC dissolution rate, unit is: �� g/ (cm2D);
C1��C3��������Cn-1��Cn: the TOC dissolution concentration recorded in whole test soak period for growth form test piece, unit: mg/L
TpFor test piece soak time, unit is: sky (d).
7. the method according to claim 1��6 any one, wherein, the degree of depth dissolution of step (3) repeats 1��2 time.
8. the method according to claim 1��6 any one, wherein, often group test group arranges two samples; Preferably include two test group.
9. the method according to claim 1��6 any one, wherein, also sets up a blank assay group, and described blank assay group and test group are distinctive in that does not place sample.
10. the method according to claim 1��6 any one, wherein, the test water of initial stage dissolution and the ultra-pure water consumption of degree of depth dissolution each respectively 300��700ml.
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| CN111148703A (en) * | 2017-09-29 | 2020-05-12 | 大日本印刷株式会社 | Sealing film for packaging liquid content, laminate comprising same, packaging material for liquid content, and package for liquid content |
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