CN106290042B - A kind of method that quick research aluminium corrodes in demineralized water - Google Patents
A kind of method that quick research aluminium corrodes in demineralized water Download PDFInfo
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- CN106290042B CN106290042B CN201510290239.1A CN201510290239A CN106290042B CN 106290042 B CN106290042 B CN 106290042B CN 201510290239 A CN201510290239 A CN 201510290239A CN 106290042 B CN106290042 B CN 106290042B
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- lacing film
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- aluminium
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Abstract
The present invention discloses a kind of method that quickly research aluminium corrodes in demineralized water, comprising steps of step 1, determine the best lacing film time, this step specifically: 1.1 hang on aluminium test piece in the constant temperature lacing film solution of different quality condition, obtain under the different lacing film times aluminum amount in aluminium test piece weight gain and lacing film solution；1.2 is as small as possible based on pH value amplitude of variation, aluminium test piece weight gain is obvious, the lacing film time lacks three principles as far as possible, by aluminum amount, lacing film solution ph in analysis aluminium test piece weight gain, lacing film solution with the variation of lacing film time, determines the best lacing film time；Step 2, aluminium test piece is hung in the constant temperature lacing film solution of different quality condition, aluminum amount in aluminium test piece weight gain and lacing film solution is obtained under the best lacing film time, to obtain each water quality factors to the affecting laws of aluminum amount in aluminium test piece weight gain and lacing film solution.The method of the present invention is easy to operate, can quickly study corrosion regularity of the aluminium in demineralized water.
Description
Technical field
The present invention relates to aluminium corrosion technology field, in particular to a kind of method that quickly research aluminium corrodes in demineralized water.
Background technique
Since fine aluminium has good thermal conductivity, thus it is applied to traditional Hai Leshi indirect air cooling unit and SCAL type
In the cooling-part (radiator) of air cooling unit.Currently, it is very few about corrosion research of the fine aluminium in condensed water, contain for this
The ununified standard of the water-chemical regime of aluminium system, therefore, from condensed water service condition, collaboration considers pH value, dissolution
Oxygen content, condensing water temperature etc. study influence factor and its effect that aluminium corrodes in demineralized water by single factor test hanging test
Rule seeks the best condensed water water-chemical regime of the air cooling unit containing aluminium, is meaningful.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of sides that quickly research aluminium corrodes in demineralized water
Method, can be used for directing study the influence factor and its action rule that aluminium corrodes in demineralized water, and then instruct air cooling unit containing aluminium
The design of condensed water water-chemical regime.
Thinking of the present invention is as follows:
Carry out the research of influence factor and its action rule that aluminium corrodes in demineralized water, it is necessary to first determine how evaluation
The difference that aluminium corrodes in different condition demineralized water.The difference of metal erosion is evaluated, is mainly commented with quality representation corrosion rate
Valence is calculated as the metal quality of corrosive wear the changing value of per surface metal quality in the unit time.Weight loss is rotten
Lose before metal and remove corrosion product after metal it is of poor quality, gain in weight be corrosion after have corrosion product metal and corrosion before
Metal it is of poor quality.For carbon steel, since its corrosion is more apparent, and corrosion product is easier to remove, so general using weightless
Method evaluates corrosion of carbon steel performance.For metallic copper, since its corrosion front and back mass change is unobvious, but taken off in its lacing film solution
The oxide fallen but has certain rule, and therefore, copper corrosion performance can be commented mainly by measurement lacing film copper ion content of solution
Valence.
Since the oxidation film that aluminium surface is formed in demineralized water is not easy to remove, weightening finish method can be used to evaluate its corrosion speed
It spends, gain in weight includes increased quality (being hereinafter " aluminium test piece weight gain "), 2. lacing film after 1. aluminium test piece lacing film in the present invention
The aluminium (being hereinafter " aluminum amount in lacing film solution ") that fall off in the process, is dissolved into lacing film solution and 3. clean aluminium test piece process
In the aluminium (being hereinafter " clean transfer aluminum amount ") that is transferred in degreasing cotton and dehydrated alcohol.Here " lacing film " refers to aluminium
Test piece is hung in lacing film solution.The lacing film time in short-term, gain in weight of the aluminium test piece in various condition demineralized waters all less, difference
It is unobvious；When the lacing film time is long, the condition of water quality of demineralized water can change, and especially pH value variation is obvious, obtain in this way
Test result has not been Corrosion results of the aluminium test piece in specified criteria demineralized water, and time-consuming, cannot accomplish Fast Evaluation.
Therefore, when research aluminium corrodes in demineralized water influence factor and its action rule, consider that pH value, dissolved oxygen contain in addition to cooperate with
The factors such as amount, condensing water temperature, it is most important that the best lacing film time is determined, with Fast Evaluation aluminium in different condition demineralized water
The difference of corrosion.
The present invention determines the best lacing film time by a series of hanging tests.Firstly, presetting a series of lacing film times.So
Afterwards, it is polished using abrasive paper for metallograph aluminium test piece, it is dry after being cleaned with dehydrated alcohol, record the quality of aluminium test piece at this time m0.It connects
, aluminium test piece is hung on respectively in the lacing film solution of different quality condition, lacing film solution, that is, demineralized water.Reach finally, taking out
The aluminium test piece of default lacing film time records the quality of aluminium test piece at this time m after cleaning drying1；Meanwhile it being surveyed using spectrophotometry
Determine aluminum amount in lacing film solution and cleans transfer aluminum amount.Test result shows that aluminium test piece weight gain is more apparent, cleans transfer aluminum amount almost
It is zero, can be neglected, the reason is that aluminium strip oxidation film not easily passs through scouring removal.Aluminum amount in lacing film solution, exceeding can
The error range ignored, so must be taken into consideration.Only consider aluminum amount in aluminium test piece weight gain and the lacing film solution in above-mentioned gain in weight.
By comprehensively considering, pH value amplitude of variation is as small as possible, aluminium test piece weight gain is obvious, the lacing film time lacks three as far as possible
Principle determines best lacing film by aluminum amount, pH value in analysis aluminium test piece weight gain, lacing film solution with the variation tendency of lacing film time
Time.Based on the best lacing film time, hanging test is carried out in the lacing film solution of different quality condition, can get each water quality factors
To the affecting laws of aluminium corrosion.
Technical scheme is as follows:
One, a kind of method that quickly research aluminium corrodes in demineralized water, comprising steps of
Step 1, best lacing film time, this step are determined specifically:
1.1 hang on aluminium test piece in the constant temperature lacing film solution of different quality condition, obtain aluminium under the different lacing film times and try
Aluminum amount in piece weight gain and lacing film solution；Different quality condition is obtained by changing at least one water quality factors of lacing film solution, water
Quality factor includes temperature, pH value and dissolved oxygen content；Lacing film solution, that is, demineralized water；
1.2 is as small as possible based on pH value amplitude of variation, aluminium test piece weight gain is obvious, the lacing film time lacks three principles as far as possible,
By analysis aluminium test piece weight gain, aluminum amount in lacing film solution, lacing film solution ph with the lacing film time variation, when determining best lacing film
Between；When it is implemented, being obtained according to aluminum amount, lacing film solution ph in aluminium test piece weight gain, lacing film solution with the variation of lacing film time
When lacing film solution ph amplitude of variation is greater than the first preset value and aluminium test piece weight gain greater than the second preset value when corresponding lacing film
Between, therefrom select the minimum lacing film time as the best lacing film time；The lacing film solution ph amplitude of variation, that is, lacing film solution
Current pH value and original pH absolute value of the difference, the first preset value and the second preset value are rule of thumb manually set；
Step 2, aluminium test piece is hung in the constant temperature lacing film solution of different quality condition, obtains aluminium under the best lacing film time
Aluminum amount in test piece weight gain and lacing film solution, to obtain influence of each water quality factors to aluminum amount in aluminium test piece weight gain and lacing film solution
Rule.
Sub-step 1.1 further comprises:
(a) a series of lacing film times are preset；
(b) it successively polishes, clean, dry aluminium test piece, and recording aluminium test piece quality m0；
(c) aluminium test piece is hung in the lacing film solution of constant temperature, aluminium test piece is taken out when reaching the default lacing film time, then into
The following measurement of row:
It successively cleans, dry aluminium test piece, and records aluminium test piece quality m1, aluminium test piece quality m1And m0Difference, that is, aluminium test piece increase
Weight；Using aluminum amount in spectrophotometry measurement lacing film solution；Measure the pH value of lacing film solution.
The temperature of lacing film solution selects in 30~80 DEG C in step 1 and step 2.
The initial pH value of lacing film solution selects in 6~10 in step 1 and step 2.
Step 2 further comprises:
2.1 change a water quality factors value, fix other water quality factors values, a series of lacing film for obtaining different quality conditions is molten
Liquid；
2.2 successively polishing, cleaning, dry aluminium test pieces, and record aluminium test piece quality m0；
2.3 hang on aluminium test piece in constant temperature lacing film solution, take out aluminium test piece when reaching the best lacing film time, successively wipe
It washes, dry aluminium test piece, and record aluminium test piece quality m1；
2.4 aluminium test piece quality m1And m0Difference, that is, aluminium test piece weight gain, using spectrophotometry measurement lacing film solution in aluminum amount；
Aluminum amount in aluminium test piece weight gain and lacing film solution under the conditions of 2.5 acquisition different qualities, analyzes the water quality being changed
The affecting laws that factor corrodes aluminium.
Two, a kind of design method of the condensed water of air cooling unit containing aluminium water-chemical regime, each water obtained using claim 1
Quality factor instructs the affecting laws of aluminum amount in aluminium test piece weight gain and lacing film solution the design of condensed water water-chemical regime.
Compared to the prior art, the invention has the advantages that and the utility model has the advantages that
1, can be real-time using conventional instrument, it is easy to operate.
2, test period is short, can quickly and accurately obtain the affecting laws that salt water quality factor corrodes aluminium, can be used for
Instruct the design of the condensed water water-chemical regime of the air cooling unit containing aluminium.
Detailed description of the invention
Fig. 1~2 are the variation relation that the aluminium test piece that embodiment 1 obtains was increased weight with the default lacing film time.
Specific embodiment
Technical solution of the present invention is further illustrated below in conjunction with specific embodiment.
Embodiment 1
The present embodiment is the specific embodiment determined the lacing film time.
(1) a series of lacing film times: 0.25h, 0.5h, 1h, 2h, 4h, 8h, 25h, 48h, 73h, 168h are preset.
(2) aluminium test piece is polished from coarse to fine to 800 mesh using abrasive paper for metallograph, aluminium specimen size be 50mm × 25mm ×
2mm dries after being cleaned with dehydrated alcohol, is placed in spare in drier.Record aluminium coupon weight m at this time0。
(3) different aluminum test piece is hung on respectively in the 300mL lacing film solution of different quality condition, keeps lacing film solution permanent
Temperature.Lacing film solution temperature is set as 50 DEG C, and pH value is respectively 6.0,7.0,7.5,8.5,9.5, and ammonium hydroxide can be used in lacing film solution ph
It adjusts.
(4) the aluminium test piece for reaching the default lacing film time is taken out, is cleaned with dehydrated alcohol, filter paper is dried, and it is dry to be placed in drier
Weighing, is denoted as m after dry1.Using aluminium content in spectrophotometry measurement lacing film solution.
The relationship that gain in weight and default lacing film time under different pH value are obtained according to above-mentioned hanging test, is shown in Fig. 1~2, figure
Middle gain in weight is aluminium test piece weight gain.
By Fig. 1~2 it is found that when identical pH value, when the lacing film time is no more than 4h, as the lacing film time extends, aluminium corrosion plus
Weight is mainly reflected in gain in weight and increases as the lacing film time extends.The corrosion rate of aluminium reduces after 4h, has what is tended towards stability to incline
To the evident regularity not changed over time again.
In addition, it is contemplated that lacing film liquor capacity is smaller, and is difficult to accomplish to be absolutely sealed, as the lacing film time extends, by
In aluminium test piece burn into CO2Into and ammonia volatilization, will lead to pH and be changed significantly.Table 1 is lacing film solution ph with the lacing film time
Change, first row indicates lacing film solution original pH in table.
As shown in Table 1, under the conditions of variant original pH, when the lacing film time is 1h, lacing film solution ph amplitude of variation
It is smaller；As the lacing film time extends, pH value is changed significantly.In addition, gain in weight is smaller, is unfavorable for comparing when the lacing film time is less than 1h
Compared with, comprehensively consider both the above factor, select the lacing film time be 1h.
1 lacing film solution ph of table with the lacing film time changing rule
Embodiment 2
The relationship of the aluminium corrosion in demineralized water and lacing film solution temperature
(1) it takes having a size of 50mm × 25mm × 2mm aluminium test piece, is polished from coarse to fine using abrasive paper for metallograph to 800
Mesh dries after being cleaned with dehydrated alcohol, is placed in spare in drier.
(2) aluminium test piece is precisely weighed, is denoted as m0.Then the constant temperature 1h time in 300mL lacing film solution is hung on.Take out aluminium
Test piece is cleaned with dehydrated alcohol, and filter paper is dried, and is taken out weighing after being placed in drier drying, is denoted as m1.Calculating difference Δ m=m1-
m0, i.e. aluminium test piece weight gain.
(3) using aluminium content in spectrophotometry measurement lacing film solution.
Aluminium test piece weight gain and aluminum amount in lacing film solution under 2 different temperatures of table and pH value
Table 2 is lacing film solution when being 50 DEG C and 60 DEG C, aluminum amount in aluminium test piece weight gain and lacing film solution under different pH value.
As seen from the above table, 50 DEG C when, pH value be 7.0 or 8.5, aluminium test piece increase weight about 2.0mg, increase weight it is obvious.60℃
When, pH is 7.0 or 8.5, and aluminium test piece weight gain about 3.0mg or so increases weight obvious.At 50 DEG C or 60 DEG C, aluminium in lacing film solution
Ionic weight is 0.010mg~0.035mg, and content is larger.
Embodiment 3
The relationship of corrosion and pH value of the aluminium in demineralized water
(1) it takes having a size of 50mm × 25mm × 2mm aluminium test piece, is polished from coarse to fine using abrasive paper for metallograph to 800
Mesh dries after being cleaned with dehydrated alcohol, is placed in spare in drier.
(2) take 350mL lacing film solution, ammonium hydroxide be added and adjusts its pH value, take wherein 50mL be used to measure its conductivity and pH
Value, remaining 300mL are used to lacing film.Used ammonium hydroxide is to obtain concentrated ammonia liquor and water according to the volume ratio dilution of 1:1000.
(3) aluminium test piece is precisely weighed, is denoted as m0.Then the constant temperature 1h time in 300mL lacing film solution is hung on.Take out aluminium
Test piece is cleaned with dehydrated alcohol, and filter paper is dried, and is taken out weighing after being placed in drier drying, is denoted as m1.Calculating difference Δ m=m1-
m0, i.e. aluminium test piece weight gain.
(4) using aluminium content in spectrophotometry measurement lacing film solution.
When table 3 is 50 DEG C of lacing film solution, aluminum amount in aluminium test piece weight gain and lacing film solution under different pH value.
Aluminum amount in aluminium test piece weight gain and lacing film solution under difference pH value at 3 50 DEG C of table
As shown in Table 3,50 DEG C when, under different pH value, aluminium test piece weight gain is 2.0mg or so, aluminium ion in lacing film solution
Amount is 0.01mg-0.10mg, and content is larger.
Claims (6)
1. a kind of method that quickly research aluminium corrodes in demineralized water characterized by comprising
Step 1, best lacing film time, this step are determined specifically:
1.1 hang on aluminium test piece in the constant temperature lacing film solution of different quality condition, obtain aluminium test piece under the different lacing film times and increase
Aluminum amount in weight and lacing film solution；Different quality condition by change lacing film solution at least one water quality factors obtain, water quality because
Element includes temperature, pH value and dissolved oxygen content；Lacing film solution, that is, demineralized water；
1.2 it is molten to obtain lacing film with the variation of lacing film time according to aluminum amount, lacing film solution ph in aluminium test piece weight gain, lacing film solution
Liquid pH value amplitude of variation is greater than the first preset value and aluminium test piece weight gain is greater than corresponding lacing film time when the second preset value, therefrom
Select the minimum lacing film time as the best lacing film time, the first preset value and the second preset value are empirical value；
Step 2, aluminium test piece is hung in the constant temperature lacing film solution of different quality condition, obtains aluminium test piece under the best lacing film time
Aluminum amount in weight gain and lacing film solution is advised to obtain influence of each water quality factors to aluminum amount in aluminium test piece weight gain and lacing film solution
Rule.
2. the method that quickly research aluminium as described in claim 1 corrodes in demineralized water, it is characterised in that:
Sub-step 1.1 further comprises:
(a) a series of lacing film times are preset；
(b) it successively polishes, clean, dry aluminium test piece, and recording aluminium test piece quality m0；
(c) aluminium test piece is hung in the lacing film solution of constant temperature, takes out aluminium test piece when reaching the default lacing film time, then carries out such as
Lower measurement: it successively cleans, dry aluminium test piece, and records aluminium test piece quality m1, aluminium test piece quality m1And m0Difference, that is, aluminium test piece increase
Weight；Using aluminum amount in spectrophotometry measurement lacing film solution；Measure the pH value of lacing film solution.
3. the method that quickly research aluminium as described in claim 1 corrodes in demineralized water, it is characterised in that:
The temperature of lacing film solution selects in 30~80 DEG C in step 1 and step 2.
4. the method that quickly research aluminium as described in claim 1 corrodes in demineralized water, it is characterised in that:
The initial pH value of lacing film solution selects in 6~10 in step 1 and step 2.
5. the method that quickly research aluminium as described in claim 1 corrodes in demineralized water, it is characterised in that:
Step 2 further comprises:
2.1 change a water quality factors value, fix other water quality factors values, obtain a series of lacing film solution of different quality conditions；
2.2 successively polishing, cleaning, dry aluminium test pieces, and record aluminium test piece quality m0；
2.3 hang on aluminium test piece in constant temperature lacing film solution, take out aluminium test piece when reaching the best lacing film time, successively clean, is dry
Dry aluminium test piece, and record aluminium test piece quality m1；
2.4 aluminium test piece quality m1And m0Difference, that is, aluminium test piece weight gain, using spectrophotometry measurement lacing film solution in aluminum amount；
Aluminum amount in aluminium test piece weight gain and lacing film solution under the conditions of 2.5 acquisition different qualities, analyzes the water quality factors being changed
To the affecting laws of aluminium corrosion.
6. a kind of design method of the condensed water of air cooling unit containing aluminium water-chemical regime, it is characterised in that:
Each water quality factors obtained using claim 1 instruct the affecting laws of aluminum amount in aluminium test piece weight gain and lacing film solution solidifying
Bear water the design of water-chemical regime.
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| CN113970515B (en) * | 2020-07-24 | 2023-11-14 | 宝山钢铁股份有限公司 | Method for accurately measuring corrosion weight gain of metal material and application thereof |
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