CN104251814A - Atmospheric corrosivity assessment method based on aluminum wire-copper bolt galvanic corrosion - Google Patents
Atmospheric corrosivity assessment method based on aluminum wire-copper bolt galvanic corrosion Download PDFInfo
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- CN104251814A CN104251814A CN201310255050.XA CN201310255050A CN104251814A CN 104251814 A CN104251814 A CN 104251814A CN 201310255050 A CN201310255050 A CN 201310255050A CN 104251814 A CN104251814 A CN 104251814A
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Abstract
The invention provides an atmospheric corrosivity assessment method based on aluminum wire-copper bolt galvanic corrosion. The method includes the steps of: winding an aluminum wire on a copper bolt thread tightly to form an assessment galvanic couple; then exposing the assessment galvanic couple in the atmosphere of a target area, and conducting analysis to obtain aluminum wire corrosion weight loss percentage; then dividing the atmospheric corrosivity grades according to the aluminum wire corrosion weight loss percentage; and finally correcting the seasonal variation of grade dividing according to the exposure period wetting time and annual average wetting time, thus obtaining a final assessment result. According to the invention, galvanic corrosion is utilized to speed up aluminum wire corrosion, and the exposure test time only needs 90 days. At the same time, according to the influence of correction to seasonal variation by the wetting time and annual average wetting time during test, accuracy of the test result in a short time can be ensured. The assessment method provided by the invention can meet the demands for atmospheric corrosivity assessment of short-cycle engineering projects, effectively accelerates demonstration and construction, and can achieve good economic benefits.
Description
Technical field
The present invention relates to a kind of atmospheric corrosiveness appraisal procedure, specifically, relate to a kind of atmospheric corrosiveness appraisal procedure based on aluminium wire-copper bolt bimetallic corrosion.
Background technology
The atmospheric corrosiveness of different regions is because the difference of climate type and atmospheric pollution level also exists difference.Atmospheric corrosiveness assessment can be the corrosion prediction of metal product or engineering structure in target area, Material selec-tion and corrosion protection design and provides foundation, effective guarantee product quality and structural safety, simultaneously conservative control material and anticorrosion process cost.
Existing atmospheric corrosiveness appraisal procedure has standard metal method and environmental factor method.Standard metal method determines atmospheric corrosiveness according to the rate of corrosion of the metal testing plate exposure tests such as carbon steel, fine aluminium, pure zinc, fine copper.Environmental factor method is meteorology according to long term monitoring and corrosive medium factor determination atmospheric corrosiveness.For obtaining sufficient corrosive effect, consider the seasonal variety of environmental baseline simultaneously, these two kinds of methods all with 1 year for the minimum period.And a large amount of engineering project cycle request is shorter, be therefore badly in need of the method that exploitation can realize atmospheric corrosiveness rapid evaluation.
Bimetallic corrosion between dissimilar metal can accelerating anode corrosion of metal speed.For the even bimetallic corrosion behavior connecing metal material, many researchists develop all kinds of simulation experiment method and means of testing, but these Method means are all for the corrosive nature of research material self.Not yet favourable bimetallic corrosion realizes the method for atmospheric corrosiveness rapid evaluation, and one of them major reason fails effectively to get rid of the impact of seasonal variation on short time test findings.Wherein, seasonal variation is exactly the most significantly that the significantly change of temperature and humidity causes metal surface Various Seasonal wetting time fluctuation comparatively large, particularly at northern area and extremely frigid zones.
Summary of the invention
The object of the invention is to solve the existing atmospheric corrosiveness appraisal procedure long problem that can not meet short period engineering project needs consuming time, a kind of method utilizing bimetallic corrosion to realize atmospheric corrosiveness rapid evaluation is provided.
The present invention is achieved through the following technical solutions:
Based on an atmospheric corrosiveness appraisal procedure for aluminium wire-copper bolt bimetallic corrosion, comprise the steps:
(1) first aluminium wire is closely wrapped on brass bolt screw thread, forms assessment electricity consumption couple;
(2) then will assess electricity consumption couple and expose 90 days in the air of target area, and analyze and obtain aluminium wire corrosion weight loss number percent;
(3) atmospheric corrosiveness grade is divided according to aluminium wire corrosion weight loss number percent again;
(4) finally revise according to the seasonal variation of wetting time to atmospheric corrosiveness grade classification, obtain final assessment result.
Described aluminium wire material is material 1100 fine aluminium, and length is 1m, and diameter is 3mm.
Described aluminium wire goes forward need remove oxide film and weigh being wound in described brass bolt.
Described brass bolt material is T2 fine copper, diameter of bolt 25mm, and screw thread is 6mm STRTHD.
Described brass bolt is provided with through hole and groove, for fixing described aluminium wire at screw thread head and the tail two ends.
Described brass bolt is designed with M10 × 1.5 standard thread at root, for coordinating fixing described assessment electricity consumption couple with insulated leg.
Described brass bolt needs to remove oxide film before the described aluminium wire of winding.
Described assessment electricity consumption couple exposure chamber in the air of target area is outdoor exposure, and position is 1.5m overhead, and direction is that bolt is axially perpendicular to ground, and open-assembly time is 90 days.
Described aluminium wire corrosion weight loss number percent is that the aluminium wire after exposing is weighed after removing corrosion product, and its mass loss accounts for the number percent of initial mass.
Described atmospheric corrosiveness grade is divided into very low, low, medium, high, very high, superelevation six grades.
During temperature, the humidity of described wetting time according to target area meteorological station, Value Data carries out statistical computation, and with temperature higher than 0 DEG C, relative humidity is wetting conditions higher than 80%.
The seasonal variation of described atmospheric corrosiveness grade classification is revised with comparing of wetting time between exposure period according to average annual wetting time.
Invention effect
The present invention utilizes the potential difference (PD) between aluminium wire and brass bolt, accelerates aluminium wire corrosion, by the exposure test time by now methodical at least one year foreshortens to 90 days, reach the object of rapid evaluation by bimetallic corrosion.Meanwhile, utilize the temperature of meteorological station, humidity duration data statistics goes out wetting time, according to duration of test wetting time and average annual wetting time correction seasonal variation on the impact of assessment result, ensure the accuracy of short time test assessment.
Accompanying drawing explanation
Fig. 1 is the machining sketch chart of brass bolt.
Fig. 2 is the machining sketch chart of the insulated leg of fixed copper bolt.
Fig. 3 is pretreated aluminium wire coil schematic diagram.
Fig. 4 is assessment electricity consumption couple manufacturing process schematic diagram.
Fig. 5 is assessment electricity consumption couple exposure frame schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, describe embodiments of the present invention in detail.
Fig. 1 is the brass bolt that present embodiment adopts, and brass bolt screw thread is 6mm pitch STRTHD.Be provided with the through hole of diameter 3.2mm at head end, afterbody is provided with wide 3mm, the groove of dark 5mm, for the two ends of fixing aluminium wire, from through hole to the reach of groove be 1m.Be M10 × 1.5 standard external in head end coupling part, fixing for coordinating with the insulated leg shown in Fig. 2.The brass bolt that present embodiment adopts can utilize the T2 copper bar material of diameter 25mm to process.
Adopt degreaser fully to clean brass bolt, remove the surface and oil contaminant processed and cause, the hydrochloric acid solution pickling of employing 1.095mg/ml 3 minutes, dry after removing brass bolt surface oxide layer.
Fig. 2 is the insulated leg that present embodiment adopts, and there is M10 × 1.5 standard female this insulated leg one end, fixing for coordinating with the brass bolt shown in Fig. 1.There is M10 × 1.5 standard external one end, is fixed in specimen holder by whole assessment electricity consumption couple for coordinating with standard nut.
The aluminium wire of diameter 3mm is cut into the segment that length is 1.2m, this segment aluminium wire is wound on the rigid cylinder that diameter is about 10cm, then takes off, form the aluminium wire coil shown in Fig. 3.
Adopt phosphoric acid and the 20g chromium trioxide adding distil water of 50g1.69g/ml to be configured to 1000ml solution, by the pickling 5 to 10 minutes in this solution being heated to 80 DEG C of described aluminium wire coil, after removal surface film oxide, drying is weighed.
See Fig. 4, the step that present embodiment makes assessment electricity consumption couple is as follows:
(1) aluminium wire coil head end is penetrated in through hole, along hand of spiral, aluminium wire is wound around wherein, avoids the formation of knuckle.
(2), when aluminium wire is wound to groove, aluminium wire end is snapped in wherein, cuts off remainder, and remainder is weighed.
(3) brass bolt is tightened on insulated leg, forms assessment electricity consumption couple.
Fig. 5 is for assessing the schematic diagram of electricity consumption couple exposure test described in present embodiment.Exposure chamber is that position is 1.5m overhead in target area outdoor exposure, and direction is that bolt is axially perpendicular to ground, and open-assembly time is 90 days.For ensureing accuracy, general employing 3 assessment electricity consumption couples do parallel experiment.
Expose after 90 days, pulled down by described assessment galvanic couple to upper aluminium wire, pickling is weighed after removing corrosion product.According to the weighing data exposing front and back, calculate its corrosion weight loss number percent.
Present embodiment, according to the aluminium wire rate of corrosion of WO village test specimen, carries out Preliminary division according to the atmospheric corrosiveness grade of table 1 to test area.Corrosion class is divided into very low, low, medium, high, very high, superelevation six ranks from low to high.
Table 1 atmospheric corrosiveness grading range
Present embodiment calculates wetting time according to Value Data when target area meteorological station temperature, humidity, and with temperature higher than 0 DEG C, relative humidity is wetting conditions higher than 80%.Year, profit Time Calculation formula was shown in formula 1, and the wetting time between exposure period can adopt same computing method.
In formula: T
w---year wetting time (h);
T
w(i, j)---this moment wetting time, when this moment temperature higher than 0 DEG C and RH>80% time,
T
w(i, j)=1, otherwise T
w(i, j)=0.
Present embodiment is revised assessment result according to duration of test wetting time and average annual wetting time, and modification method is in table 2.Correction later evaluation result is the highest is no more than 6 grades, and minimum is 1 grade.
Table 2 reassessment method
The present invention utilizes aluminium wire-copper bolt bimetallic corrosion, by the atmospheric corrosiveness evaluation time by now methodical at least one year foreshortens to 90 days.Simultaneously according to wetting time correction seasonal variation on the impact of assessment result.Show in the evaluate application of the different regions such as Forests in Wanning, Hainan Islands (coastal), Jiangjin, Chongqing (manufacturing district), Heilungkiang Mo River, Lhasa, Dunhuang, Gansu Province, the present invention is when the evaluation time significantly shortens, and assessment result is consistent with existing standard metal method and environmental factor method.Application of the present invention can meet the needs of short period engineering project atmospheric corrosiveness assessment, and effectively accelerate demonstration construction, economic benefit is good.
Above-described embodiment is just described preferred implementation, not limits scope of the present invention.Under not departing from the present invention and designing the prerequisite of spirit, those of ordinary skill in the art, to the various distortion of technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.
Claims (9)
1., based on an atmospheric corrosiveness appraisal procedure for aluminium wire-copper bolt bimetallic corrosion, it is characterized in that, comprise the steps:
1) first aluminium wire is closely wrapped on brass bolt screw thread, forms assessment electricity consumption couple;
2) then expose certain hour by assessment electricity consumption couple air, analyze and obtain aluminium wire corrosion weight loss number percent;
3) atmospheric corrosiveness grade is divided according to aluminium wire corrosion weight loss number percent again;
4) finally revise according to the seasonal variation of wetting time to atmospheric corrosiveness grade classification, obtain final assessment result.
2. atmospheric corrosiveness appraisal procedure as claimed in claim 1, is characterized in that: described assessment electricity consumption couple adopts A1100 aluminium wire as anode, adopts T2 brass bolt as negative electrode.
3. atmospheric corrosiveness appraisal procedure as claimed in claim 2, it is characterized in that: described aluminium wire diameter is 3mm, brass bolt diameter is 25mm, and screw thread is pitch 6mm STRTHD.
4. the atmospheric corrosiveness appraisal procedure as described in claims 1 to 3 any one, is characterized in that: before being wound assessment electricity consumption couple, carrying out pickling, remove oxide on surface to aluminium wire and brass bolt.
5. the atmospheric corrosiveness appraisal procedure as described in Claims 1 to 4 any one, it is characterized in that: described assessment electricity consumption couple exposure chamber in the air of target area is outdoor exposure, position is 1.5m overhead, and direction is that bolt is axially perpendicular to ground, and open-assembly time is 90 days.
6. as claimed in any one of claims 1 to 5, wherein atmospheric corrosiveness appraisal procedure, is characterized in that: described aluminium wire corrosion weight loss number percent be aluminium wire after exposing after removing corrosion product, its mass loss accounts for the number percent of initial mass.
7. the atmospheric corrosiveness appraisal procedure as described in claim 1 ~ 6 any one, is characterized in that: with aluminium wire corrosion weight loss number percent from low to high, is very low, low, medium, high, very high, superelevation six grades by atmospheric corrosiveness grade classification.
8. the atmospheric corrosiveness appraisal procedure as described in claim 1 ~ 7 any one, it is characterized in that: during temperature, the humidity of described wetting time according to target area meteorological station, Value Data carries out statistical computation, with temperature higher than 0 DEG C, relative humidity is wetting conditions higher than 80%.
9. the atmospheric corrosiveness appraisal procedure as described in claim 1 ~ 8 any one, is characterized in that: the seasonal variation of described atmospheric corrosiveness grade classification is finally revised with comparing of wetting time between exposure period according to average annual wetting time.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111141661A (en) * | 2019-10-29 | 2020-05-12 | 中国电器科学研究院股份有限公司 | Method for evaluating galvanic corrosion of mechanical connection structure of dissimilar metal plates in automobile |
| CN114264591A (en) * | 2021-12-23 | 2022-04-01 | 中国兵器工业第五九研究所 | Device and method for evaluating corrosion appearance of metal standard part |
| CN117250146A (en) * | 2023-11-20 | 2023-12-19 | 中汽数据(天津)有限公司 | Evaluation method for galvanic corrosion reversal of automobile metal plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2365977B (en) * | 2000-07-19 | 2005-01-19 | Acm Instr | Corrosion monitoring device for multiple phase solutions |
| CN101738365A (en) * | 2008-11-06 | 2010-06-16 | 北京有色金属研究总院 | Accelerated test method for simulating atmospheric corrosion of metal materials |
| CN101782499A (en) * | 2009-01-21 | 2010-07-21 | 中国科学院金属研究所 | Method for predicting atmospheric corrosion rate of metal material |
| CN101608996A (en) * | 2009-07-22 | 2009-12-23 | 中国兵器工业第五九研究所 | The assay method of inland non-industrial atmospheric corrosiveness |
| PL213916B1 (en) * | 2010-06-21 | 2013-05-31 | Politechnika Wroclawska | Method for testing corrosion resistance of galvanic couples and sample for testing corrosion resistance of galvanic couples |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111141661A (en) * | 2019-10-29 | 2020-05-12 | 中国电器科学研究院股份有限公司 | Method for evaluating galvanic corrosion of mechanical connection structure of dissimilar metal plates in automobile |
| CN114264591A (en) * | 2021-12-23 | 2022-04-01 | 中国兵器工业第五九研究所 | Device and method for evaluating corrosion appearance of metal standard part |
| CN117250146A (en) * | 2023-11-20 | 2023-12-19 | 中汽数据(天津)有限公司 | Evaluation method for galvanic corrosion reversal of automobile metal plate |
| CN117250146B (en) * | 2023-11-20 | 2024-04-09 | 中汽数据(天津)有限公司 | Evaluation method for galvanic corrosion reversal of automobile metal plate |
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