CN102252941B - The method for detecting chromic anhydride content in Cr-plating Bath - Google Patents
The method for detecting chromic anhydride content in Cr-plating Bath Download PDFInfo
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- CN102252941B CN102252941B CN201110161746.7A CN201110161746A CN102252941B CN 102252941 B CN102252941 B CN 102252941B CN 201110161746 A CN201110161746 A CN 201110161746A CN 102252941 B CN102252941 B CN 102252941B
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- chromic anhydride
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Abstract
The present invention relates to detection technique field, more particularly, to a kind of method for detecting chromic anhydride content in Cr-plating Bath.It solves prior art operation difficulty greatly, the not high technical problem of precision.This method comprises the steps：Chromic anhydride content and density relationship in A, measure Cr-plating Bath；B, measure Cr-plating Bath relationship between density and temperature；Chromic anhydride content in C, acquisition Cr-plating Bath.Compared with prior art, the advantage of the method for chromic anhydride content is in this detection Cr-plating Bath：It is easy to implement, can intuitively it measure very much, accuracy of detection is high, can easily be corrected, cost is relatively low.
Description
Technical field
The present invention relates to detection technique field, more particularly, to a kind of method for detecting chromic anhydride content in Cr-plating Bath.
Background technology
Chromic anhydride (CrO3) be chromium plating tank liquor main component, the control of chromic anhydride content is extremely important for the quality of chromium plating.
At present, the chromic anhydride content in detection Cr-plating Bath is measured usually using the redox titration in chemical analysis.This
The method of kind is complex, it is necessary to which preparing standard solution, process is longer, and the technical requirements to analysis personnel are very high.Usual identifier
What member can test to Cr-plating Bath at various temperatures, and the density of Cr-plating Bath can change with the change of temperature,
This will result in very big evaluated error.Therefore, people have carried out long-term exploration, it is proposed that various schemes, still
Fail to obtain relatively reasonable solution route.
The content of the invention
Regarding the issue above, the present invention provides a kind of easy to implement, accuracy of detection is high, lower-cost detection
The method of chromic anhydride content in Cr-plating Bath.
To reach above-mentioned purpose, present invention employs following technical proposal：The side of chromic anhydride content in this detection Cr-plating Bath
Method, it is characterised in that this method comprises the steps：
Chromic anhydride content and density relationship in A, measure Cr-plating Bath：In mutually synthermal and CrO3And H2SO4Weight is than constant
Under the conditions of, the density of Cr-plating Bath when measuring different chromic anhydride contents, so as to obtain mutually synthermal and CrO3And H2SO4Weight ratio is not
Chromic anhydride content and density relationship in Cr-plating Bath under conditions of change, described chromic anhydride content and density relationship are as follows：CCrO3=
1437.4d-1439.3, CrO in formula3Chromic anhydride content is represented, d represents Cr-plating Bath density, coefficient R1 2=0.9986；
B, measure Cr-plating Bath relationship between density and temperature：Chromic anhydride content is identical and CrO3And H2SO4Weight is than constant bar
Under part, the density of Cr-plating Bath during measurement different temperatures, so as to obtain, chromic anhydride content is identical and CrO3And H2SO4Weight is than constant
Under conditions of temperature correction facotor, described temperature correction facotor is as follows：Temperature correction facotor=3E-05T2+0.0016T+
0.9797,3E-05 is 3 minus 5 powers for being multiplied by 10 in formula, and T represents temperature, coefficient R2 2=0.9974；
Chromic anhydride content in C, acquisition Cr-plating Bath：Chromium plating before not corrected by densitometer directly according to step A is molten
Chromic anhydride content in liquid, then measures Cr-plating Bath temperature and obtains temperature correction facotor, the step A chromic anhydride contents measured are multiplied by into temperature
Correction coefficient is spent, the chromic anhydride content in corrected rear Cr-plating Bath is obtained.
In above-mentioned detection Cr-plating Bath in the method for chromic anhydride content, in above-mentioned step A, Cr-plating Bath temperature is
10 DEG C, CrO3And H2SO4Weight ratio is 100: 1, and chromic anhydride content is at 120 g/l~480 g/l.
In above-mentioned step A, density is 1.086 grams/cm during 120 g/l of chromic anhydride content3；140 g/l of chromic anhydride content
Shi Midu is 1.098 grams/cm3；Density is 1.112 grams/cm during 160 g/l of chromic anhydride content3；Density during 180 g/l of chromic anhydride content
For 1.127 grams/cm3；Density is 1.142 grams/cm during 200 g/l of chromic anhydride content3；Density is during 220 g/l of chromic anhydride content
1.154 gram/cm3；Density is 1.167 grams/cm during 240 g/l of chromic anhydride content3；Density is 1.182 during 260 g/l of chromic anhydride content
Gram/cm3；Density is 1.196 grams/cm during 280 g/l of chromic anhydride content3；During 300 g/l of chromic anhydride content density be 1.210 grams/
cm3；Density is 1.225 grams/cm during 320 g/l of chromic anhydride content3；Density is 1.242 grams/cm during 340 g/l of chromic anhydride content3；Chromium
Density is 1.252 grams/cm during 360 g/l of acid anhydride content3；Density is 1.262 grams/cm during 380 g/l of chromic anhydride content3；Chromic anhydride content
Density is 1.274 grams/cm at 400 g/l3；Density is 1.292 grams/cm during 420 g/l of chromic anhydride content3；440 grams of chromic anhydride content/
Density is 1.315 grams/cm when rising3；Density is 1.324 grams/cm during 460 g/l of chromic anhydride content3；It is close during 480 g/l of chromic anhydride content
Spend for 1.331 grams/cm3。
In above-mentioned detection Cr-plating Bath in the method for chromic anhydride content, in above-mentioned step B, chromic anhydride in Cr-plating Bath
250 g/l of content, H2SO425 g/l of content.
In above-mentioned step B, when temperature is 1 DEG C, temperature correction facotor is 0.98133；When temperature is 2 DEG C, temperature school
Positive coefficient is 0.98302；When temperature is 3 DEG C, temperature correction facotor is 0.98447；When temperature is 4 DEG C, temperature correction facotor is
0.98658；When temperature is 5 DEG C, temperature correction facotor is 0.98845；When temperature is 6 DEG C, temperature correction facotor is 0.99038；
When temperature is 7 DEG C, temperature correction facotor is 0.99237；When temperature is 8 DEG C, temperature correction facotor is 0.99442；Temperature is 9 DEG C
When, temperature correction facotor is 0.99653；When temperature is 10 DEG C, temperature correction facotor is 0.9987；When temperature is 11 DEG C, temperature
Correction coefficient is 1.00093；When temperature is 12 DEG C, temperature correction facotor is 1.00322；When temperature is 13 DEG C, temperature correction system
Number is 1.00557；When temperature is 14 DEG C, temperature correction facotor is 1.00798；When temperature is 15 DEG C, temperature correction facotor is
1.01045；When temperature is 16 DEG C, temperature correction facotor is 1.01298；When temperature is 17 DEG C, temperature correction facotor is
1.01557；When temperature is 18 DEG C, temperature correction facotor is 1.01822；When temperature is 19 DEG C, temperature correction facotor is
1.02093；When temperature is 20 DEG C, temperature correction facotor is 1.0237；When temperature is 21 DEG C, temperature correction facotor is 1.02653；
When temperature is 22 DEG C, temperature correction facotor is 1.02942；When temperature is 23 DEG C, temperature correction facotor is 1.03237；Temperature is
At 24 DEG C, temperature correction facotor is 1.03538；When temperature is 25 DEG C, temperature correction facotor is 1.03845；When temperature is 26 DEG C,
Temperature correction facotor is 1.04158；When temperature is 27 DEG C, temperature correction facotor is 1.04477；When temperature is 28 DEG C, temperature school
Positive coefficient is 1.04802；When temperature is 29 DEG C, temperature correction facotor is 1.05133；When temperature is 30 DEG C, temperature correction facotor
For 1.0547；When temperature is 31 DEG C, temperature correction facotor is 1.05813；When temperature is 32 DEG C, temperature correction facotor is
1.06162；When temperature is 33 DEG C, temperature correction facotor is 1.06517；When temperature is 34 DEG C, temperature correction facotor is 1.6878；
When temperature is 35 DEG C, temperature correction facotor is 1.07245；When temperature is 36 DEG C, temperature correction facotor is 1.07618；Temperature is
At 37 DEG C, temperature correction facotor is 1.07997；When temperature is 38 DEG C, temperature correction facotor is 1.08382；When temperature is 39 DEG C,
Temperature correction facotor is 1.08773；When temperature is 40 DEG C, temperature correction facotor is 1.0917；When temperature is 41 DEG C, temperature correction
Coefficient is 1.09573；When temperature is 42 DEG C, temperature correction facotor is 1.09982；When temperature is 43 DEG C, temperature correction facotor is
1.10397；When temperature is 44 DEG C, temperature correction facotor is 1.10818；When temperature is 45 DEG C, temperature correction facotor is
1.11245；When temperature is 46 DEG C, temperature correction facotor is 1.11678；When temperature is 47 DEG C, temperature correction facotor is
1.12117；When temperature is 48 DEG C, temperature correction facotor is 1.12562；When temperature is 49 DEG C, temperature correction facotor is
1.13013；When temperature is 50 DEG C, temperature correction facotor is 1.1347；When temperature is 51 DEG C, temperature correction facotor is 1.13933；
When temperature is 52 DEG C, temperature correction facotor is 1.14402；When temperature is 53 DEG C, temperature correction facotor is 1.14877；Temperature is
At 54 DEG C, temperature correction facotor is 1.15358；When temperature is 55 DEG C, temperature correction facotor is 1.15845；When temperature is 56 DEG C,
Temperature correction facotor is 1.16338；When temperature is 57 DEG C, temperature correction facotor is 1.16837；When temperature is 58 DEG C, temperature school
Positive coefficient is 1.17342；When temperature is 59 DEG C, temperature correction facotor is 1.17853；When temperature is 60 DEG C, temperature correction facotor
For 1.1837.
Compared with prior art, the advantage of the method for chromic anhydride content is in this detection Cr-plating Bath：It is easy to implement, energy
Enough intuitively to measure very much, accuracy of detection is high, can easily be corrected, cost is relatively low.
Embodiment
The method of chromic anhydride content comprises the steps in this detection Cr-plating Bath：
Chromic anhydride content and density relationship in A, measure Cr-plating Bath：In mutually synthermal and CrO3And H2SO4Weight is than constant
Under the conditions of, the density of Cr-plating Bath when measuring different chromic anhydride contents, so as to obtain mutually synthermal and CrO3And H2SO4Weight ratio is not
Chromic anhydride content and density relationship in Cr-plating Bath under conditions of change, described chromic anhydride content and density relationship are as follows：CCrO3=
1437.4d-1439.3, CrO in formula3Chromic anhydride content is represented, d represents Cr-plating Bath density, coefficient R1 2=0.9986.Chromium plating
Solution temperature is 10 DEG C, CrO3And H2SO4Weight ratio is 100: 1, and chromic anhydride content is at 120 g/l~480 g/l.
B, measure Cr-plating Bath relationship between density and temperature：Chromic anhydride content is identical and CrO3And H2SO4Weight is than constant bar
Under part, the density of Cr-plating Bath during measurement different temperatures, so as to obtain, chromic anhydride content is identical and CrO3And H2SO4Weight is than constant
Under conditions of temperature correction facotor, described temperature correction facotor is as follows：Temperature correction facotor=3E-05T2+0.0016T+
0.9797,3E-05 is 3 minus 5 powers for being multiplied by 10 in formula, and T represents temperature, coefficient R2 2=0.9974；In Cr-plating Bath
250 g/l of chromic anhydride content, H2SO425 g/l of content.
Chromic anhydride content in C, acquisition Cr-plating Bath：Chromium plating before not corrected by densitometer directly according to step A is molten
Chromic anhydride content in liquid, then measures Cr-plating Bath temperature and obtains temperature correction facotor, the step A chromic anhydride contents measured are multiplied by into temperature
Correction coefficient is spent, the chromic anhydride content in corrected rear Cr-plating Bath is obtained.
In above-mentioned steps A, in 10 DEG C, CrO3∶H2SO4=100: 1, chromic anhydride content is in 120 g/l~480 g/l scopes
Interior, the practical measurement data of Cr-plating Bath density and chromic anhydride content relation are as follows：
In above-mentioned steps B, temperature correction facotor such as following table at each temperature：
According to step A, the densitometer for the chromic anhydride content that can be detected in Cr-plating Bath is made, can pole using the densitometer
It simply determines the chromic anhydride content in Cr-plating Bath.Then temperature correction facotor is utilized, measuring band under different temperatures is eliminated and comes
Error.
For example, during measurement, it is 234 that Cr-plating Bath content is measured with direct-reading densitometer, and measures Cr-plating Bath with thermometer
Temperature be 35 DEG C, actual chromic anhydride content=234 × 1.07245=251 g/l.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology neck belonging to of the invention
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Although more having used term herein, the possibility using other terms is not precluded from.Use these terms
Just for the sake of more easily describing and explaining the essence of the present invention；Be construed as any additional limitation be all with
What spirit of the present invention was disagreed.
Claims (1)
1. a kind of method for detecting chromic anhydride content in Cr-plating Bath, it is characterised in that this method comprises the steps：
Chromic anhydride content and density relationship in A, measure Cr-plating Bath：In mutually synthermal and CrO3And H2SO4Weight is than constant condition
Under, the density of Cr-plating Bath when measuring different chromic anhydride contents, so as to obtain mutually synthermal and CrO3And H2SO4Weight is than constant
Under the conditions of chromic anhydride content and density relationship in Cr-plating Bath, described chromic anhydride content and density relationship be as follows：CCrO3=
1437.4d-1439.3, C in formulaCrO3Chromic anhydride content is represented, d represents Cr-plating Bath density, coefficient R1 2=0.9986；
B, measure Cr-plating Bath relationship between density and temperature：In the identical CrO of chromic anhydride content3And H2SO4Weight than under conditions of constant,
The density of Cr-plating Bath when measuring different temperatures, so as to obtain, chromic anhydride content is identical and CrO3And H2SO4Weight is than constant condition
Lower temperature correction facotor, described temperature correction facotor is as follows：Temperature correction facotor=3E-05T2+ 0.0016T+0.9797, formula
Middle 3E-05 is 3 minus 5 powers for being multiplied by 10, and T represents temperature, coefficient R2 2=0.9974；
Chromic anhydride content in C, acquisition Cr-plating Bath：In Cr-plating Bath before not corrected by densitometer directly according to step A
Chromic anhydride content, then measures Cr-plating Bath temperature and obtains temperature correction facotor, the step A chromic anhydride contents measured are multiplied by into temperature school
Positive coefficient, obtains the chromic anhydride content in corrected rear Cr-plating Bath；
In above-mentioned step A, Cr-plating Bath temperature is 10 DEG C, CrO3And H2SO4Weight ratio is 100: 1, and chromic anhydride content is 120
G/l~480 g/l；In above-mentioned step B, 250 g/l of chromic anhydride content, H in Cr-plating Bath2SO425 g/l of content.
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| 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 |
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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 |
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