Evaluation method for corrosion inhibitor used in alcohol ether alternative fuel system

A technology of corrosion inhibitor and alternative fuel, applied in the direction of material electrochemical variables, etc., can solve the problems affecting test accuracy, fuel alcohol phase separation, quantitative comparison, etc., to achieve the effect of fast test method, small relative error, and fast method

Active Publication Date: 2016-04-20
SHANGHAI RES INST OF CHEM IND
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Problems solved by technology

[0004] However, there are two main problems in the use of alcohol ether alternative fuels: first, the water content in fuel alcohol will cause phase separation problems; chemical corrosion problem
The disadvantage is that the working electrode spacing of 1.0mm can easily cause the problem of stable diffusion of the solution, that is, the dissolved metal ions at the solution/i

Method used

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  • Evaluation method for corrosion inhibitor used in alcohol ether alternative fuel system
  • Evaluation method for corrosion inhibitor used in alcohol ether alternative fuel system
  • Evaluation method for corrosion inhibitor used in alcohol ether alternative fuel system

Examples

Experimental program
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Embodiment 1

[0035] A rapid evaluation method for corrosion inhibitors of alcohol ether alternative fuel systems: the material of the electrochemical test sample is No. 45 carbon structural steel, and the sample size is 10mm×10mm. Before the test, ① the sample was polished step by step with 240#, 600#, 800#, 1000# metallographic water sandpaper to remove the surface oxide film and surface defects; ② the polished sample was rinsed repeatedly in running tap water, without Water ethanol dehydration, acetone degreasing. During the test, the sample is loaded into the electrolytic cell solution containing or containing no corrosion inhibitor and quantitative formic acid, the test sample is used as the working electrode, the metal platinum sheet is used as the auxiliary electrode, and the saturated calomel electrode is used as the reference electrode ( Among them, the Lujin capillary is a salt bridge), after the test system is stable ( change﹤1mV / min.), carry out the steady-state cathode and an...

Embodiment 2

[0043] A rapid evaluation method for alcohol ether alternative fuel system corrosion inhibitors:

[0044] Experimental method of electrochemical test: The material of the electrochemical test sample is No. 45 carbon structural steel, and the sample size is 10mm×10mm. Before the test, ① the sample was polished step by step with 240#, 600#, 800#, 1000# metallographic water sandpaper to remove the surface oxide film and surface defects; ② the polished sample was rinsed repeatedly in running tap water, without Water ethanol dehydration, acetone degreasing. During the test, the sample is placed in an electrolytic cell solution prepared with deionized water without or containing corrosion inhibitors and quantitative formic acid, the test sample is used as the working electrode, the metal platinum sheet is used as the auxiliary electrode, and the saturated calomel The electrode is a reference electrode (wherein, the Lujin capillary is a salt bridge), and after the test system is sta...

Embodiment 3

[0052] This embodiment is the same as embodiment 1 except that the test rate of the polarization curve is 20mv / min.

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Abstract

The invention relates to an evaluation method for a corrosion inhibitor used in an alcohol ether alternative fuel system. The method comprises the following steps: (1) placing a metal sample into a formic acid water solution which does not contain a corrosion inhibitor to be tested and a formic acid water solution which contains the corrosion inhibitor to be tested separately, using the metal sample as a working electrode to form a three-electrode electrochemical testing system, and performing steady state cathode and anode polarization curve testing through semi-logarithmic coordinates after a natural corrosion potential shown in the description is stabilized; (2) extrapolating a Tafel linear region of a cathode polarization curve to be intersected with a horizontal line of the stabilized natural corrosion potential shown in the description, and obtaining a natural corrosion current icorr. from the intersection point; (3) calculating a corrosion inhibition efficiency of the metal sample placed in the formic acid water solution which contains the corrosion inhibitor to be tested through the natural corrosion current icorr., so as to obtain the corrosion inhibition effect of the corrosion inhibitor to be tested. Compared with the prior art, the evaluation method has the advantages of being stable in data, fast, small in error and the like, and can realize rapid evaluation and screening of the corrosion inhibitor used in the alcohol ether alternative fuel system.

Description

technical field [0001] The invention relates to the field of alcohol ether alternative fuels, in particular to an evaluation method for alcohol ether alternative fuel system corrosion inhibitors. Background technique [0002] China's energy issues have become a major bottleneck restricting the sustainable development of the national economy, and directly affect the national energy strategy security. According to the data released by the General Administration of Customs on January 11, 2012, my country's dependence on imported crude oil reached 56.5% in 2011. Since becoming a net oil importer in 1993, my country's dependence on foreign crude oil has continued to increase, and will continue to increase for a long time to come. The National Development and Reform Commission has identified ten key energy-saving projects in the mid- and long-term special plans for energy conservation, one of which is to save and replace petroleum projects, develop alcohol-ether fuels, and promot...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N27/30
CPCG01N27/26G01N27/30
Inventor 彭东辉浦静雯李志刚吴向阳徐静安韩坤韩婕何建铧
Owner SHANGHAI RES INST OF CHEM IND
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