CN104764853A - Method for rapidly detecting continuity of refrigeration evaporator aluminum pipe oxide film - Google Patents
Method for rapidly detecting continuity of refrigeration evaporator aluminum pipe oxide film Download PDFInfo
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- CN104764853A CN104764853A CN201410003104.8A CN201410003104A CN104764853A CN 104764853 A CN104764853 A CN 104764853A CN 201410003104 A CN201410003104 A CN 201410003104A CN 104764853 A CN104764853 A CN 104764853A
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Abstract
The invention discloses a method for rapidly detecting the continuity of a refrigeration evaporator aluminum pipe oxide film. The method comprises alkali solution and copper sulfate-hydrochloric acid solution cross titration examination of the oxide film, and concretely comprises the following steps: 1, alkali solution titration; and 2, copper sulfate-hydrochloric acid solution titration. The alkali solution and copper sulfate-hydrochloric acid solution cross titration detection is adopted in the detection of the continuity of the oxide film, so the reliability of the detection result of the continuity of the oxide film is ensured; and the detection method has the advantages of wide application range, no restriction by the thickness of the oxide film, short detection period, simple operation, low cost, and easy popularization and use.
Description
Technical field
The invention belongs to refrigeration technology field, be specifically related to the successional method for quick of a kind of aluminum pipe oxidation film layer.
Background technology
Because aluminum pipe is oxidizable, for improving its decay resistance, refrigerator refrigeration evaporator aluminum tube surfaces needs by oxidation processes, makes aluminum tube surfaces form the oxide film of one deck densification, and thickness is 8-12um.Oxidation processes mode is generally anode oxidation process, and the aluminium after anodic oxidation, enhances corrosion resistance, does not corrode in neutral salt spray test through several thousand hours.
For judging aluminum tube surfaces oxide film formational situation and antiseptic effect, need to carry out salt spray test by salt spray test chamber, salt spray test uses according to 5% Nacl of quality than proportioning, and test period is 96 ~ 128 hours, if aluminum tube surfaces be judged to without spot and tubercular corrosion qualified.This detection method wastes time and energy, and round of visits is very long.
At present, the successional detection method of antianode oxidation film layer is chemical replacement detection method, and the national standard-GB/T8752 of such as China adopts copper sulfate method.Copper sulfate method principle is: when copper-bath drop in expose metallic matrix or oxide film cover bad Aluminum-aluminum alloy anode oxide film surface time, chemical replacement reactive deposition is there is in copper on aluminium surface, stain or red point can be observed at the discontinuous place of oxide film, thus judge that whether Aluminum-aluminum alloy anode oxide film is continuous.The method detects within the thickness of oxidation film layer is defined as 5 um, and refrigerator refrigeration evaporator aluminum pipe oxidation film layer thickness is 8-12um, thus cause judge inaccurate, affect testing result.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of efficient and convenient, successional method for quick of testing result reliable refrigeration evaporator aluminum pipe oxidation film layer.
To achieve these goals, the technical solution used in the present invention is as follows:
The successional method for quick of a kind of refrigeration evaporator aluminum pipe oxidation film layer, described detection method comprises Cross-titration inspection oxidation film layer being carried out to alkali lye and copper sulphate-hydrochloric acid solution, comprises the steps:
1), alkali-titration
At 25 DEG C, use buret by the NaOH drop of 10wt% on aluminum pipe oxidation film layer, record starts from titration the time t occurring bubble to aluminum pipe oxidation film layer titration region, as t < 13 seconds, can judge that the continuity of this evaporator aluminum pipe oxidation film layer is defective; When t >=13 second, then carry out next step and detect;
2), copper sulphate-hydrochloric acid solution titration
Get 20g cupric sulfate crystals and 20ml hydrochloric acid, prepare copper sulphate-hydrochloric acid solution with distilled water diluting to 1000ml; Again at 20 ~ 25 DEG C, buret is used to drop on aluminum pipe oxidation film layer by the copper sulphate-hydrochloric acid solution of preparation, titration time is more than 5 minutes, observe described aluminum pipe oxidation film layer titration region surface spot situation, when black and/or punctation do not appear in titration region surface, can judge that the continuity of this evaporator aluminum pipe oxidation film layer is qualified.
Above-mentioned steps 2) in greenhouse temperature affect the judgement of result, further, require as follows to titration time:
When titration temperature is 25 ~ 30 DEG C, the titration time of copper sulphate-hydrochloric acid solution is more than 3 minutes.
When titration temperature is more than 30 DEG C, the titration time of copper sulphate-hydrochloric acid solution is more than 2 minutes.
When titration temperature is 15 ~ 20 DEG C, the titration time of copper sulphate-hydrochloric acid solution is more than 8 minutes.
As titration temperature <15 DEG C, the titration time of copper sulphate-hydrochloric acid solution is more than 12 minutes.
Compared with prior art, beneficial effect of the present invention is:
The present invention is to the successional detection of oxidation film layer, the Cross-titration of alkali lye and copper sulphate-hydrochloric acid solution is adopted to detect, ensure that the reliability of oxidation film layer continuity testing result, this detection method is applied widely, the restriction of not oxidated thicknesses of layers, sense cycle is short, easy and simple to handle, and with low cost being easy to is promoted the use of.
Embodiment
For ease of understanding the present invention, it is as follows that the present invention enumerates embodiment.Those skilled in the art should understand, described embodiment only understands the present invention for helping, and should not be considered as concrete restriction of the present invention.
embodiment 1
The successional method for quick of a kind of refrigeration evaporator aluminum pipe oxidation film layer, comprises the steps:
1), alkali-titration
At 25 DEG C, use buret by the NaOH drop of 10wt% on aluminum pipe oxidation film layer, record starts from titration the time t occurring bubble to aluminum pipe oxidation film layer titration region, as t < 13 seconds, can judge that the continuity of this evaporator aluminum pipe oxidation film layer is defective; When t >=13 second, then carry out next step and detect;
2), copper sulphate-hydrochloric acid solution titration
Get 20g cupric sulfate crystals and 20ml hydrochloric acid, prepare copper sulphate-hydrochloric acid solution with distilled water diluting to 1000ml; Again at 20 ~ 25 DEG C, buret is used to drop on aluminum pipe oxidation film layer by the copper sulphate-hydrochloric acid solution of preparation, titration time is more than 5 minutes, observe described aluminum pipe oxidation film layer titration region surface spot situation, when black and/or punctation appear in titration region surface, can judge that the continuity of this evaporator aluminum pipe oxidation film layer is qualified.
embodiment 2
The successional method for quick of a kind of refrigeration evaporator aluminum pipe oxidation film layer, comprises the steps:
1), copper sulphate-hydrochloric acid solution titration
Titration method is same as the step 2 of embodiment 1), when black and/or punctation appear in titration region surface, can judge that the continuity of this evaporator aluminum pipe oxidation film layer is defective; When black and/or punctation do not appear in titration region surface, then carry out next step and detect.
2), alkali-titration
Titration method is same as the step 1) of embodiment 1, as t < 13 seconds, can judge that the continuity of this evaporator aluminum pipe oxidation film layer is defective; When t >=13 second, can judge that the continuity of this evaporator aluminum pipe oxidation film layer is qualified.
embodiment 3
The successional method for quick of a kind of refrigeration evaporator aluminum pipe oxidation film layer, compare with embodiment 2 with embodiment 1, difference is the step 2 of embodiment 1) or embodiment 2 step 1) in the titration temperature of copper sulphate-hydrochloric acid solution titration when being 25 ~ 30 DEG C, the titration time of copper sulphate-hydrochloric acid solution is more than 3 minutes.
embodiment 4
The successional method for quick of a kind of refrigeration evaporator aluminum pipe oxidation film layer, compare with embodiment 2 with embodiment 1, difference is the step 2 of embodiment 1) or embodiment 2 step 1) in the titration temperature of copper sulphate-hydrochloric acid solution titration when being more than 30 DEG C, the titration time of copper sulphate-hydrochloric acid solution is more than 2 minutes.
embodiment 5
The successional method for quick of a kind of refrigeration evaporator aluminum pipe oxidation film layer, compare with embodiment 2 with embodiment 1, difference is the step 2 of embodiment 1) or embodiment 2 step 1) in the titration temperature of copper sulphate-hydrochloric acid solution titration when being 25 ~ 30 DEG C, the titration time of copper sulphate-hydrochloric acid solution is more than 3 minutes.
embodiment 6
The successional method for quick of a kind of refrigeration evaporator aluminum pipe oxidation film layer, compare with embodiment 2 with embodiment 1, difference is the step 2 of embodiment 1) or embodiment 2 step 1) in the titration temperature <15 DEG C of copper sulphate-hydrochloric acid solution titration time, the titration time of copper sulphate-hydrochloric acid solution is more than 12 minutes.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (5)
1. the successional method for quick of refrigeration evaporator aluminum pipe oxidation film layer, is characterized in that, described detection method comprises Cross-titration inspection oxidation film layer being carried out to alkali lye and copper sulphate-hydrochloric acid solution, comprises the steps:
1), alkali-titration
At 25 DEG C, use buret by the NaOH drop of 10wt% on aluminum pipe oxidation film layer, record starts from titration the time t occurring bubble to aluminum pipe oxidation film layer titration region, as t < 13 seconds, can judge that the continuity of this evaporator aluminum pipe oxidation film layer is defective; When t >=13 second, then carry out next step and detect;
2), copper sulphate-hydrochloric acid solution titration
Get 20g cupric sulfate crystals and 20ml hydrochloric acid, prepare copper sulphate-hydrochloric acid solution with distilled water diluting to 1000ml; Again at 20 ~ 25 DEG C, buret is used to drop on aluminum pipe oxidation film layer by the copper sulphate-hydrochloric acid solution of preparation, titration time is more than 5 minutes, observe the non-pimple situation in described aluminum pipe oxidation film layer titration region, when black and/or punctation appear in titration region surface, can judge that the continuity of this evaporator aluminum pipe oxidation film layer is qualified.
2. the successional method for quick of a kind of refrigeration evaporator aluminum pipe oxidation film layer as claimed in claim 1, is characterized in that: when described step 2) titration temperature when being 25 ~ 30 DEG C, the titration time of copper sulphate-hydrochloric acid solution is more than 3 minutes.
3. the successional method for quick of a kind of refrigeration evaporator aluminum pipe oxidation film layer as claimed in claim 1, is characterized in that: when described step 2) titration temperature when being more than 30 DEG C, the titration time of copper sulphate-hydrochloric acid solution is more than 2 minutes.
4. the successional method for quick of a kind of refrigeration evaporator aluminum pipe oxidation film layer as claimed in claim 1, is characterized in that: when described step 2) titration temperature when being 15 ~ 20 DEG C, the titration time of copper sulphate-hydrochloric acid solution is more than 8 minutes.
5. the successional method for quick of a kind of refrigeration evaporator aluminum pipe oxidation film layer as claimed in claim 1, is characterized in that: when described step 2) titration temperature <15 DEG C time, the titration time of copper sulphate-hydrochloric acid solution is more than 12 minutes.
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| CN201410003104.8A CN104764853A (en) | 2014-01-03 | 2014-01-03 | Method for rapidly detecting continuity of refrigeration evaporator aluminum pipe oxide film |
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| CN201410003104.8A CN104764853A (en) | 2014-01-03 | 2014-01-03 | Method for rapidly detecting continuity of refrigeration evaporator aluminum pipe oxide film |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106483247A (en) * | 2016-10-16 | 2017-03-08 | 合肥太通制冷科技有限公司 | A kind of oxide-film method for quick |
| CN108020546A (en) * | 2017-12-28 | 2018-05-11 | 吉林省电力科学研究院有限公司 | A kind of Chemical Cleaning and Passivation film quality check meter, test liquid and application method |
-
2014
- 2014-01-03 CN CN201410003104.8A patent/CN104764853A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106483247A (en) * | 2016-10-16 | 2017-03-08 | 合肥太通制冷科技有限公司 | A kind of oxide-film method for quick |
| CN108020546A (en) * | 2017-12-28 | 2018-05-11 | 吉林省电力科学研究院有限公司 | A kind of Chemical Cleaning and Passivation film quality check meter, test liquid and application method |
| CN108020546B (en) * | 2017-12-28 | 2020-11-06 | 吉林省电力科学研究院有限公司 | Quality tester for chemical cleaning passivation film, testing solution and using method |
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Application publication date: 20150708 |