CN102252941A - Method for measuring content of chromic anhydride in chromium plating solution - Google Patents
Method for measuring content of chromic anhydride in chromium plating solution Download PDFInfo
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- CN102252941A CN102252941A CN2011101617467A CN201110161746A CN102252941A CN 102252941 A CN102252941 A CN 102252941A CN 2011101617467 A CN2011101617467 A CN 2011101617467A CN 201110161746 A CN201110161746 A CN 201110161746A CN 102252941 A CN102252941 A CN 102252941A
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- Prior art keywords
- chromic anhydride
- plating solution
- chromium plating
- anhydride content
- temperature
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Links
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 title claims abstract description 161
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 64
- 239000011651 chromium Substances 0.000 title claims abstract description 64
- 238000007747 plating Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012937 correction Methods 0.000 claims description 77
- 238000001514 detection method Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 41
- 238000004458 analytical method Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
Landscapes
- Electroplating Methods And Accessories (AREA)
- Electroplating And Plating Baths Therefor (AREA)
Abstract
The invention relates to the technical field of measurement and in particular relates to a method for measuring the content of chromic anhydride in a chromium plating solution. The method can be used for solving the technical problems of the prior art such as high operational difficulty, low accuracy and the like. The method comprises the following steps: A) determining the relation between the content of the chromic anhydride in the chromium plating solution and the density of the chromium plating solution; B) measuring the relation between the density and temperature of the chromium plating solution; and C) obtaining the content of the chromic anhydride in the chromium plating solution. Compared with the prior art, the method for measuring the content of the chromic anhydride in the chromium plating solution has the following advantages: the method is easy to apply, is very intuitive to measure, has high measurement precision, is very convenient to correct and has lower cost.
Description
Technical field
The present invention relates to the detection technique field, especially relate to a kind of method that detects chromic anhydride content in the chromium plating solution.
Background technology
Chromic anhydride (CrO
3) be the principal ingredient of chromium plating tank liquor, the control of chromic anhydride content is extremely important for the quality of chromium plating.At present, the chromic anhydride content that detects in the chromium plating solution uses the redox titration in the chemical analysis to measure usually.This method is comparatively complicated, needs preparing standard solution, and process is longer, and is very high to analyst's technical requirement.Usually the reviewer can test to chromium plating solution at various temperatures, and the density of chromium plating solution can change along with variation of temperature, and this will cause very big error at measurment.For this reason, people have carried out long-term exploration, have proposed various schemes, but all fail to obtain comparatively reasonably solution route.
Summary of the invention
The objective of the invention is at the problems referred to above, provide a kind of easy to implement, accuracy of detection height, the method for chromic anhydride content in the lower-cost detection chromium plating solution.
For achieving the above object, the present invention has adopted following technical proposal: the method for chromic anhydride content in this detection chromium plating solution is characterized in that this method comprises the steps:
Chromic anhydride content and density relationship in A, the mensuration chromium plating solution: at uniform temp and CrO
3And H
2SO
4Under the constant condition of weight ratio, the density of chromium plating solution when measuring different chromic anhydride content, thus obtain uniform temp and CrO
3And H
2SO
4Chromic anhydride content and density relationship in the chromium plating solution under the constant condition of weight ratio, described chromic anhydride content and density relationship are as follows: CCrO
3=1437.4d-1439.3, CrO in the formula
3Represent chromic anhydride content, d represents chromium plating solution density, coefficient R
1 2=0.9986;
B, mensuration chromium plating solution density and temperature relation: identical and CrO at chromic anhydride content
3And H
2SO
4Under the constant condition of weight ratio, the density of chromium plating solution when measuring different temperatures, thus obtain the identical and CrO of chromic anhydride content
3And H
2SO
4Temperature correction facotor under the constant condition of weight ratio, described temperature correction facotor is as follows: temperature correction facotor=3E-05T
2+ 0.0016T+0.9797,3E-05 is 3 and multiply by 10 negative 5 powers, T representation temperature, coefficient R in the formula
2 2=0.9974;
Chromic anhydride content in C, the acquisition chromium plating solution: directly obtain to revise chromic anhydride content in the preceding chromium plating solution by densitometer according to steps A, measure the chromium plating solution temperature then and obtain temperature correction facotor, the chromic anhydride content that steps A is recorded multiply by temperature correction facotor, obtains the chromic anhydride content in the chromium plating solution after overcorrect.
In the method for chromic anhydride content, in above-mentioned steps A, the chromium plating solution temperature is 10 ℃, CrO in above-mentioned detection chromium plating solution
3And H
2SO
4Weight ratio is 100: 1, and chromic anhydride content is at 120 grams per liters～480 grams per liters.
In above-mentioned steps A, density is 1.086 gram/cm during chromic anhydride content 120 grams per liters
3Density is 1.098 gram/cm during chromic anhydride content 140 grams per liters
3Density is 1.112 gram/cm during chromic anhydride content 160 grams per liters
3Density is 1.127 gram/cm during chromic anhydride content 180 grams per liters
3Density is 1.142 gram/cm during chromic anhydride content 200 grams per liters
3Density is 1.154 gram/cm during chromic anhydride content 220 grams per liters
3Density is 1.167 gram/cm during chromic anhydride content 240 grams per liters
3Density is 1.182 gram/cm during chromic anhydride content 260 grams per liters
3Density is 1.196 gram/cm during chromic anhydride content 280 grams per liters
3Density is 1.210 gram/cm during chromic anhydride content 300 grams per liters
3Density is 1.225 gram/cm during chromic anhydride content 320 grams per liters
3Density is 1.242 gram/cm during chromic anhydride content 340 grams per liters
3Density is 1.252 gram/cm during chromic anhydride content 360 grams per liters
3Density is 1.262 gram/cm during chromic anhydride content 380 grams per liters
3Density is 1.274 gram/cm during chromic anhydride content 400 grams per liters
3Density is 1.292 gram/cm during chromic anhydride content 420 grams per liters
3Density is 1.315 gram/cm during chromic anhydride content 440 grams per liters
3Density is 1.324 gram/cm during chromic anhydride content 460 grams per liters
3Density is 1.331 gram/cm during chromic anhydride content 480 grams per liters
3
In above-mentioned detection chromium plating solution in the method for chromic anhydride content, in above-mentioned step B, chromic anhydride content 250 grams per liters in the chromium plating solution, H
2SO
4Content 25 grams per liters.
In above-mentioned step B, when temperature was 1 ℃, temperature correction facotor was 0.98133; When temperature was 2 ℃, temperature correction facotor was 0.98302; When temperature was 3 ℃, temperature correction facotor was 0.98447; When temperature was 4 ℃, temperature correction facotor was 0.98658; When temperature was 5 ℃, temperature correction facotor was 0.98845; When temperature was 6 ℃, temperature correction facotor was 0.99038; When temperature was 7 ℃, temperature correction facotor was 0.99237; When temperature was 8 ℃, temperature correction facotor was 0.99442; When temperature was 9 ℃, temperature correction facotor was 0.99653; When temperature was 10 ℃, temperature correction facotor was 0.9987; When temperature was 11 ℃, temperature correction facotor was 1.00093; When temperature was 12 ℃, temperature correction facotor was 1.00322; When temperature was 13 ℃, temperature correction facotor was 1.00557; When temperature was 14 ℃, temperature correction facotor was 1.00798; When temperature was 15 ℃, temperature correction facotor was 1.01045; When temperature was 16 ℃, temperature correction facotor was 1.01298; When temperature was 17 ℃, temperature correction facotor was 1.01557; When temperature was 18 ℃, temperature correction facotor was 1.01822; When temperature was 19 ℃, temperature correction facotor was 1.02093; When temperature was 20 ℃, temperature correction facotor was 1.0237; When temperature was 21 ℃, temperature correction facotor was 1.02653; When temperature was 22 ℃, temperature correction facotor was 1.02942; When temperature was 23 ℃, temperature correction facotor was 1.03237; When temperature was 24 ℃, temperature correction facotor was 1.03538; When temperature was 25 ℃, temperature correction facotor was 1.03845; When temperature was 26 ℃, temperature correction facotor was 1.04158; When temperature was 27 ℃, temperature correction facotor was 1.04477; When temperature was 28 ℃, temperature correction facotor was 1.04802; When temperature was 29 ℃, temperature correction facotor was 1.05133; When temperature was 30 ℃, temperature correction facotor was 1.0547; When temperature was 31 ℃, temperature correction facotor was 1.05813; When temperature was 32 ℃, temperature correction facotor was 1.06162; When temperature was 33 ℃, temperature correction facotor was 1.06517; When temperature was 34 ℃, temperature correction facotor was 1.6878; When temperature was 35 ℃, temperature correction facotor was 1.07245; When temperature was 36 ℃, temperature correction facotor was 1.07618; When temperature was 37 ℃, temperature correction facotor was 1.07997; When temperature was 38 ℃, temperature correction facotor was 1.08382; When temperature was 39 ℃, temperature correction facotor was 1.08773; When temperature was 40 ℃, temperature correction facotor was 1.0917; When temperature was 41 ℃, temperature correction facotor was 1.09573; When temperature was 42 ℃, temperature correction facotor was 1.09982; When temperature was 43 ℃, temperature correction facotor was 1.10397; When temperature was 44 ℃, temperature correction facotor was 1.10818; When temperature was 45 ℃, temperature correction facotor was 1.11245; When temperature was 46 ℃, temperature correction facotor was 1.11678; When temperature was 47 ℃, temperature correction facotor was 1.12117; When temperature was 48 ℃, temperature correction facotor was 1.12562; When temperature was 49 ℃, temperature correction facotor was 1.13013; When temperature was 50 ℃, temperature correction facotor was 1.1347; When temperature was 51 ℃, temperature correction facotor was 1.13933; When temperature was 52 ℃, temperature correction facotor was 1.14402; When temperature was 53 ℃, temperature correction facotor was 1.14877; When temperature was 54 ℃, temperature correction facotor was 1.15358; When temperature was 55 ℃, temperature correction facotor was 1.15845; When temperature was 56 ℃, temperature correction facotor was 1.16338; When temperature was 57 ℃, temperature correction facotor was 1.16837; When temperature was 58 ℃, temperature correction facotor was 1.17342; When temperature was 59 ℃, temperature correction facotor was 1.17853; When temperature was 60 ℃, temperature correction facotor was 1.1837.
Compared with prior art, the advantage of the method for chromic anhydride content is in this detection chromium plating solution: easy to implement, can measure very intuitively, and the accuracy of detection height can be proofreaied and correct easily, and cost is lower.
Embodiment
The method of chromic anhydride content comprises the steps: in this detection chromium plating solution
Chromic anhydride content and density relationship in A, the mensuration chromium plating solution: at uniform temp and CrO
3And H
2SO
4Under the constant condition of weight ratio, the density of chromium plating solution when measuring different chromic anhydride content, thus obtain uniform temp and CrO
3And H
2SO
4Chromic anhydride content and density relationship in the chromium plating solution under the constant condition of weight ratio, described chromic anhydride content and density relationship are as follows: CCrO
3=1437.4d-1439.3, CrO in the formula
3Represent chromic anhydride content, d represents chromium plating solution density, coefficient R
1 2=0.9986.The chromium plating solution temperature is 10 ℃, CrO
3And H
2SO
4Weight ratio is 100: 1, and chromic anhydride content is at 120 grams per liters～480 grams per liters.
B, mensuration chromium plating solution density and temperature relation: identical and CrO at chromic anhydride content
3And H
2SO
4Under the constant condition of weight ratio, the density of chromium plating solution when measuring different temperatures, thus obtain the identical and CrO of chromic anhydride content
3And H
2SO
4Temperature correction facotor under the constant condition of weight ratio, described temperature correction facotor is as follows: temperature correction facotor=3E-05T
2+ 0.0016T+0.9797,3E-05 is 3 and multiply by 10 negative 5 powers, T representation temperature, coefficient R in the formula
2 2=0.9974; Chromic anhydride content 250 grams per liters in the chromium plating solution, H
2SO
4Content 25 grams per liters.
Chromic anhydride content in C, the acquisition chromium plating solution: directly obtain to revise chromic anhydride content in the preceding chromium plating solution by densitometer according to steps A, measure the chromium plating solution temperature then and obtain temperature correction facotor, the chromic anhydride content that steps A is recorded multiply by temperature correction facotor, obtains the chromic anhydride content in the chromium plating solution after overcorrect.
Among the above-mentioned steps A, at 10 ℃, CrO
3: H
2SO
4=100: 1, chromic anhydride content is in 120 grams per liters～480 grams per liter scopes, and the practical measurement data of chromium plating solution density and chromic anhydride content relation are as follows:
Among the above-mentioned steps B, temperature correction facotor at each temperature such as following table:
According to steps A, making can detect the densitometer of the chromic anhydride content in the chromium plating solution, uses this densitometer can measure chromic anhydride content in the chromium plating solution extremely simply.Utilize temperature correction facotor then, eliminate and measure the error of bringing under the different temperatures.
For example, during measurement, recording chromium plating solution content with the direct-reading densitometer is 234, and is 35 ℃ with the temperature that thermometer records chromium plating solution, actual chromic anhydride content=234 * 1.07245=251 grams per liter.
Specific embodiment described herein only is that the present invention's spirit is illustrated.The technician of the technical field of the invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used term morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; They are construed to any additional restriction all is contrary with spirit of the present invention.
Claims (3)
1. a method that detects chromic anhydride content in the chromium plating solution is characterized in that this method comprises the steps:
Chromic anhydride content and density relationship in A, the mensuration chromium plating solution: at uniform temp and CrO
3And H
2SO
4Under the constant condition of weight ratio, the density of chromium plating solution when measuring different chromic anhydride content, thus obtain uniform temp and CrO
3And H
2SO
4Chromic anhydride content and density relationship in the chromium plating solution under the constant condition of weight ratio, described chromic anhydride content and density relationship are as follows: CCrO
3=1437.4d-1439.3, CrO in the formula
3Represent chromic anhydride content, d represents chromium plating solution density, coefficient R
1 2=0.9986;
B, mensuration chromium plating solution density and temperature relation: at the identical CrO of chromic anhydride content
3And H
2SO
4Under the constant condition of weight ratio, the density of chromium plating solution when measuring different temperatures, thus obtain the identical and CrO of chromic anhydride content
3And H
2SO
4Temperature correction facotor under the constant condition of weight ratio, described temperature correction facotor is as follows: temperature correction facotor=3E-05T
2+ 0.0016T+0.9797,3E-05 is 3 and multiply by 10 negative 5 powers, T representation temperature, coefficient R in the formula
2 2=0.9974;
Chromic anhydride content in C, the acquisition chromium plating solution: directly obtain to revise chromic anhydride content in the preceding chromium plating solution by densitometer according to steps A, measure the chromium plating solution temperature then and obtain temperature correction facotor, the chromic anhydride content that steps A is recorded multiply by temperature correction facotor, obtains the chromic anhydride content in the chromium plating solution after overcorrect.
2. the method for chromic anhydride content is characterized in that in the detection chromium plating solution according to claim 1, and in above-mentioned steps A, the chromium plating solution temperature is 10 ℃, CrO
3And H
2SO
4Weight ratio is 100: 1, and chromic anhydride content is at 120 grams per liters～480 grams per liters.
3. the method for chromic anhydride content is characterized in that in the detection chromium plating solution according to claim 1, in above-mentioned step B, and chromic anhydride content 250 grams per liters in the chromium plating solution, H
2SO
4Content 25 grams per liters.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110161746.7A CN102252941B (en) | 2011-06-16 | 2011-06-16 | The method for detecting chromic anhydride content in Cr-plating Bath |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110161746.7A CN102252941B (en) | 2011-06-16 | 2011-06-16 | The method for detecting chromic anhydride content in Cr-plating Bath |
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| CN102252941B CN102252941B (en) | 2017-09-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568658A (en) * | 2014-12-24 | 2015-04-29 | 正大青春宝药业有限公司 | Method for quickly detecting content of volatile matter in traditional Chinese medicinal steam distillate |
| CN114152664A (en) * | 2021-12-21 | 2022-03-08 | 南通醋酸纤维有限公司 | Method for testing concentration of magnesium acetate aqueous solution |
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| EP1359404A1 (en) * | 2001-07-26 | 2003-11-05 | Matsushita Electric Industrial Co., Ltd. | SOLUTION DENSITY MEASURING METHOD, SAMPLE CELL USED FOR THE METHOD, AND SOLUTION DENSITY MEASURING DEVICE |
| CN201311383Y (en) * | 2008-11-20 | 2009-09-16 | 江汉大学 | Device for on-line detecting alum concentration during tap water production |
| CN101685057A (en) * | 2008-09-27 | 2010-03-31 | 宝山钢铁股份有限公司 | Non-contact solution concentration detection method and device thereof |
| CN101776559A (en) * | 2010-01-28 | 2010-07-14 | 东风汽车有限公司 | Method for detecting concentration of urea aqueous solution |
| CN101782492A (en) * | 2010-03-24 | 2010-07-21 | 天津三星电机有限公司 | Method for determining volume fraction of single component in two-component mixed solution through density detection |
-
2011
- 2011-06-16 CN CN201110161746.7A patent/CN102252941B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1359404A1 (en) * | 2001-07-26 | 2003-11-05 | Matsushita Electric Industrial Co., Ltd. | SOLUTION DENSITY MEASURING METHOD, SAMPLE CELL USED FOR THE METHOD, AND SOLUTION DENSITY MEASURING DEVICE |
| CN101685057A (en) * | 2008-09-27 | 2010-03-31 | 宝山钢铁股份有限公司 | Non-contact solution concentration detection method and device thereof |
| CN201311383Y (en) * | 2008-11-20 | 2009-09-16 | 江汉大学 | Device for on-line detecting alum concentration during tap water production |
| CN101776559A (en) * | 2010-01-28 | 2010-07-14 | 东风汽车有限公司 | Method for detecting concentration of urea aqueous solution |
| CN101782492A (en) * | 2010-03-24 | 2010-07-21 | 天津三星电机有限公司 | Method for determining volume fraction of single component in two-component mixed solution through density detection |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568658A (en) * | 2014-12-24 | 2015-04-29 | 正大青春宝药业有限公司 | Method for quickly detecting content of volatile matter in traditional Chinese medicinal steam distillate |
| CN114152664A (en) * | 2021-12-21 | 2022-03-08 | 南通醋酸纤维有限公司 | Method for testing concentration of magnesium acetate aqueous solution |
| CN114152664B (en) * | 2021-12-21 | 2023-12-19 | 南通醋酸纤维有限公司 | Method for testing concentration of magnesium acetate aqueous solution |
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