CN104677769A - Method for testing influence of flow velocities on corrosion inhibiting performance of metal corrosion inhibitor - Google Patents
Method for testing influence of flow velocities on corrosion inhibiting performance of metal corrosion inhibitor Download PDFInfo
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- CN104677769A CN104677769A CN201510136072.3A CN201510136072A CN104677769A CN 104677769 A CN104677769 A CN 104677769A CN 201510136072 A CN201510136072 A CN 201510136072A CN 104677769 A CN104677769 A CN 104677769A
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Abstract
The invention discloses a method for testing influence of flow velocities on the corrosion inhibiting performance of a metal corrosion inhibitor. The method comprises the following steps: processing a metal pipe into test pieces for later use; putting the test pieces into a vessel, removing dirt on the surfaces of the test pieces, and further cleaning; polishing, measuring the size, and recording; scrubbing, blowing the test pieces to be in a drying state, drying, weighing, and recording data; hanging the test pieces in corrosion inhibitors having different flow velocities, adjusting the pH values of the corrosion inhibitors to 4.0-10.0, and carrying out corrosion reaction for 8-12h; taking out and washing the test pieces, immersing by adding a rust remover for 3-5min, and cleaning; drying by scrubbing wiping and blowing, and weighing; and determining the corrosion rates and the corrosion inhibition rates of each set of test pieces according to initially measured mass numerical values and finally measured mass values, and simultaneously setting blank control. The method disclosed by the invention is capable of rapidly testing the influence of the flow velocities on the corrosion inhibiting performance of the corrosion inhibitor; furthermore, the method is accurate in test result, simple in test step and low in test cost; and thus, a theoretical basis is provided for applying the corrosion inhibitor.
Description
Technical field
The present invention relates to the method for testing of a kind of metal inhibitor corrosion inhibition by flow rate effect, belong to test chemical method field.
Background technology
When being present in environment (medium) with suitable concentration and form, can prevent or slow down chemical substance or the compound of material corrosion, therefore corrosion inhibiter also can be called corrosion inhibitor.Its consumption is very little, but Be very effective.The method of this protection metal claims corrosion inhibiter to protect.
In environmental protection, because corrosion inhibiter compounds has polar group, the sulphion atomic radius in this polar group is comparatively large, electronegative, is easy to and the metal cation Cheng Jian in waste water, generates the corrosion inhibiter of indissoluble, therefore, is commonly used for extraction intercalating agent.Be mainly used in two aspects.Precipitate flotation agent and solvent sublation collecting agent is made on the one hand, the complexing agent being separated the heavy metal ion in wastewater treatment and being used as in supercritical fluid chelating extraction with low-molecular-weight corrosion inhibiter.Moreover be amino two thiocarbonyls are introduced polystyrene polymethacrylate derivatives, containing in the high molecular polymer skeletons such as the polymkeric substance of polyethylene polyamine and polyethers, preparation has the chelate resin of certain physical strength or water miscible chelate resin.Water miscible corrosion inhibiter chelate resin is the novel oilfield sewage-treating agent grown up in the U.S. nineteen nineties, has efficient degreasing performance, also has the functions such as sterilization, antiscale, inhibition simultaneously.
At present, corrosion inhibiter and derivant thereof are widely used in the fields such as rubber, oil, agricultural, mining industry, medicine, environmental protection and analytical chemistry as degreaser, water quality cleansing agent, antisludging agent, film forming agent and resistance to compression adjuvant etc.After, the application of such material will expand further.The corrosion mitigating effect of corrosion inhibiter and the pH value, temperature, flow velocity etc. of its working concentration and medium closely related, therefore strictly should select according to protected object, environmental baseline.So, study a kind of method that suitable test corrosion inhibiter affects by flow speed value, seem particularly necessary.
Summary of the invention
The object of the invention is to for deficiency of the prior art, provide a kind of metal inhibitor corrosion inhibition by the method for testing of flow rate effect, test result is accurate, and testing procedure is simple, and testing cost is low, for the application of corrosion inhibiter provides theoretical foundation.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of metal inhibitor corrosion inhibition is by the method for testing of flow rate effect, and its innovative point is: it is for subsequent use metal pipe material to be processed into test piece; Get test piece and put into vessel, except strip dirt, and continuous wash; Polishing, measurement size, and record; Clean and dry up test piece, being dried, weigh and write down data; Test piece is suspended in the corrosion inhibiter of different in flow rate, and regulates the pH value of corrosion inhibiter to be 4.0 ~ 10.0, corrosion reaction 8 ~ 12h; Taking-up test piece is rinsed, and puts it into rust remover and soaks 3 ~ 5min, clean; Dry, dry up, weigh; According to beginning mass metering numerical value and whole mass metering value, obtain the corrosion rate and corrosion inhibition rate of often organizing test specimen, blank is set simultaneously.
Further, described specimen size size is 3 × 5cm.
Further, described test piece removes strip dirt by absolute ethyl alcohol.
Further, described corrosion inhibiter flow speed value is set to 60m/s, 50m/s, 40m/s, 30m/s, 20m/s, 10m/s respectively.
Further, described rust remover comprises the constituent of following parts by weight: sodium molybdate 0.5 ~ 10 part, phosphoric acid 5 ~ 20 parts, 45 ~ 70 parts, water, SI-1 adjuvant 5 ~ 10 parts.
Beneficial effect of the present invention is as follows:
(1) metal inhibitor corrosion inhibition of the present invention is by the method for testing of flow rate effect, can make the impact of corrosion inhibiter corrosion inhibition by flow speed value by Quick Measuring, and test result is accurate, testing procedure is simple, testing cost is low, for the application of corrosion inhibiter provides theoretical foundation.
(2) metal inhibitor corrosion inhibition of the present invention is by the method for testing of flow rate effect, and specimen size size is 3 × 5cm, effectively can ensure test result accurately simultaneously, reduces energy dissipation and reduces experimental cost.
(3) metal inhibitor corrosion inhibition of the present invention is by the method for testing of flow rate effect, and test piece removes strip dirt by absolute ethyl alcohol, can not cause test piece secondary pollution, and easily and effectively, decontamination is potent in decontamination process.
(4) metal inhibitor corrosion inhibition of the present invention is by the method for testing of flow rate effect, rust remover is consisted of the constituent of following parts by weight: sodium molybdate 0.5 ~ 10 part, phosphoric acid 5 ~ 20 parts, 45 ~ 70 parts, water, SI-1 adjuvant 5 ~ 10 parts, composition is simple, wide material sources, while not injuring strip, the rust cleaning time is short, general only needs 3 ~ 5min, and scrubbing rate reaches more than 98%.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is elaborated.
Embodiment 1
Metal inhibitor corrosion inhibition, by the method for testing of flow rate effect, is specially: it is for subsequent use metal pipe material to be processed into test piece, and specimen size size is 3 × 5cm; Get test piece and put into vessel, test piece removes strip dirt by absolute ethyl alcohol, and continuous wash; Polishing, measurement size, and record; Clean and dry up test piece, being dried, weigh and write down data; Test piece be suspended in the corrosion inhibiter of different in flow rate, corrosion inhibiter flow speed value is set to 60m/s respectively, 50m/s, 40m/s, 30m/s, 20m/s, 10m/s; And regulate the pH value of corrosion inhibiter to be 8.0, corrosion reaction 10h; Taking-up test piece is rinsed, and puts it into rust remover and soaks 3 ~ 5min, clean; Dry, dry up, weigh; According to beginning mass metering numerical value and whole mass metering value, obtain the corrosion rate and corrosion inhibition rate of often organizing test specimen, blank is set simultaneously.
Wherein, rust remover comprises the constituent of following parts by weight: sodium molybdate 0.5 part, phosphoric acid 5 parts, 45 parts, water, SI-1 adjuvant 5 parts.
The rust remover of the present embodiment is not while injuring strip, and the rust cleaning time is short, and the rust cleaning time is 5min, and scrubbing rate reaches more than 98%.
Embodiment 2
On the basis of embodiment 1, rust remover comprises the constituent of following parts by weight: sodium molybdate 10 parts, phosphoric acid 20 parts, 70 parts, water, SI-1 adjuvant 10 parts.
The rust remover of the present embodiment is not while injuring strip, and the rust cleaning time is short, and the rust cleaning time is 4.2min, and scrubbing rate reaches more than 98%.
Embodiment 3
On the basis of embodiment 1, rust remover comprises the constituent of following parts by weight: sodium molybdate 8 parts, phosphatase 11 6 parts, 68 parts, water, SI-1 adjuvant 8 parts.
The rust remover of the present embodiment is not while injuring strip, and the rust cleaning time is short, and the rust cleaning time is 3min, and scrubbing rate reaches more than 98%.
Wherein, the computing formula of the corrosion speed in embodiment 1,2,3:
Vcorr-corrosion rate in formula, mm/a; C-conversion constant, its value is 8.76 × 104; Of poor quality before and after Δ M-test piece experiment, g; S-strip amasss, cm
2; T-etching time, h; ρ-steel lacing film material density, g/cm
3
The computing formula of corrosion inhibition rate:
V
1- V
2
μ=------------
V
1
μ-corrosion inhibition rate in formula, %;
V
1the corrosion speed of the test piece of-Jia corrosion inhibiter, mm/a;
V
2-blank sample (not adding corrosion inhibiter) test piece corrosion speed, mm/a.
The embodiment of the present invention is tested when flow speed value is 60m/s, 50m/s, 40m/s, 30m/s, 20m/s, 10m/s respectively, and experimental result is as shown in the table:
| Sequence number | Flow speed value | V 2 | Strip situation |
| 1 | 60m/s | 1.6547 | Uniform corrosion |
| 2 | 50m/s | 0.5436 | Uniform corrosion |
| 3 | 40m/s | 0.1389 | A small amount of corrosion |
| 4 | 30m/s | 0.0721 | A small amount of corrosion |
| 5 | 20m/s | 0.0539 | As before bright and clean |
| 6 | 10m/s | 0.0067 | As before bright and clean |
As seen from the above table: this corrosion inhibiter is greater than in the environment of 20m/s at flow speed value, test piece seriously corroded, possible cause is that flow velocity is too fast, the adsorption rate of corrosion inhibiter is reduced, thus exacerbate corrosion of metal, along with flow speed value reduces to 10m/s, test piece is no corrosion almost, system liquid is as clear as crystal, has no impurity and sediment generation.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (5)
1. metal inhibitor corrosion inhibition is by the method for testing of flow rate effect, it is characterized in that: it is for subsequent use metal pipe material to be processed into test piece; Get test piece and put into vessel, except strip dirt, and continuous wash; Polishing, measurement size, and record; Clean and dry up test piece, being dried, weigh and write down data; Test piece is suspended in the corrosion inhibiter of different in flow rate, and regulates the pH value of corrosion inhibiter to be 4.0 ~ 10.0, corrosion reaction 8 ~ 12h; Taking-up test piece is rinsed, and puts it into rust remover and soaks 3 ~ 5min, clean; Dry, dry up, weigh; According to beginning mass metering numerical value and whole mass metering value, obtain the corrosion rate and corrosion inhibition rate of often organizing test specimen, blank is set simultaneously.
2. metal inhibitor corrosion inhibition according to claim 1 is by the method for testing of flow rate effect, it is characterized in that: described specimen size size is 3 × 5cm.
3. metal inhibitor corrosion inhibition according to claim 1 is by the method for testing of flow rate effect, it is characterized in that: described test piece removes strip dirt by absolute ethyl alcohol.
4. metal inhibitor corrosion inhibition according to claim 1 is by the method for testing of flow rate effect, it is characterized in that: described corrosion inhibiter flow speed value is set to 60m/s, 50m/s, 40m/s, 30m/s, 20m/s, 10m/s respectively.
5. metal inhibitor corrosion inhibition according to claim 1 is by the method for testing of flow rate effect, it is characterized in that: described rust remover comprises the constituent of following parts by weight: sodium molybdate 0.5 ~ 10 part, phosphoric acid 5 ~ 20 parts, 45 ~ 70 parts, water, SI-1 adjuvant 5 ~ 10 parts.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105158102A (en) * | 2015-06-04 | 2015-12-16 | 天津亿利科能源科技发展股份有限公司 | Method for evaluating vapor phase inhibitor effects |
| CN107917854A (en) * | 2017-11-21 | 2018-04-17 | 国网福建省电力有限公司 | The quantitatively characterizing method of sulfur corrosion degree in a kind of transformer oil |
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| CN103808622A (en) * | 2012-11-13 | 2014-05-21 | 叶媚 | Method for testing influence on corrosion inhibition performance of corrosion inhibitor caused by pH value |
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2015
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Cited By (2)
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| CN105158102A (en) * | 2015-06-04 | 2015-12-16 | 天津亿利科能源科技发展股份有限公司 | Method for evaluating vapor phase inhibitor effects |
| CN107917854A (en) * | 2017-11-21 | 2018-04-17 | 国网福建省电力有限公司 | The quantitatively characterizing method of sulfur corrosion degree in a kind of transformer oil |
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Application publication date: 20150603 |