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Comprehensive analysis method of electrochemical impedance spectrum for metal material surface characteristics

A technology of metal materials and surface properties, applied in the direction of material electrochemical variables, etc., can solve the problems that hinder the efficiency and clarity of research and development work, and the lack of adjustment basis in the production process.

Inactive Publication Date: 2007-03-28
SHAOGUAN COLLEGE
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above reasons, in the industrial production related to metal materials such as forming foil, battery, electroplating, metal pretreatment, etc., there is a lack of technology for on-site tracking and detection of surface performance changes of metal materials in each process link, usually only according to a certain process. The quality of the finished product or semi-finished product guesses whether the process conditions are appropriate or not, and there is a lack of appropriate adjustment basis for some key production links, which has considerable blindness
In the research and development process of related products, the lack of suitable, objective and sensitive evaluation methods to provide reliable detailed information on the changes in the wettability and electrochemical properties of metal surfaces also hinders the efficiency and clarity of research and development work.

Method used

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  • Comprehensive analysis method of electrochemical impedance spectrum for metal material surface characteristics
  • Comprehensive analysis method of electrochemical impedance spectrum for metal material surface characteristics
  • Comprehensive analysis method of electrochemical impedance spectrum for metal material surface characteristics

Examples

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example 1

[0044] Example 1, the present invention can be used to evaluate the impact of the medium and process conditions used to clean the metal surface on the wettability and electrochemical activity of the metal surface. For example, the A 3 Steel, and after being heated in an oven at different temperatures for a certain period of time, it is cooled to room temperature in a desiccator. After soaking in 3% NaCl aqueous solution, the impedance spectra of different soaking times were measured immediately at the open circuit potential. The specific measurement conditions are: use Solartron 1280Z electrochemical instrument, the disturbance amplitude is 5mV, the frequency range is 0.1Hz-10kHz, the stainless steel sheet is used as the auxiliary electrode, the saturated calomel electrode is used as the reference electrode, and the apparent measurement area is about 12cm 2 , fitting the data with the mCRR transmission line model. Figure 2 shows the discrete parameter C i with the character...

example 2

[0048] Example 2, the effect of silane pretreatment on the metal surface is greatly affected by the process conditions. Among them, it is of great significance to accurately determine the appropriate aging temperature and time. Now an example is given to illustrate the application of this method in this respect. A washed with acetone 3 Soak the steel in an ethanol solution containing 1% KH-550 for 30-60 seconds, take it out, dry it at room temperature, and then put it in an oven for aging under different conditions (140°C, 0.5h, five-pointed star; 140°C, 1h, upper triangle ; 160°C, 1h, solid circles), and finally cooled to room temperature in a desiccator. The measurement conditions and data analysis method of the impedance spectrum are the same as Example 1, and 4 parallel samples are measured for each condition, and the analysis results are shown in Fig. 5 and Fig. 6 . Visible parallel samples of C * and R 0 The parameter value distribution is relatively concentrated, and...

example 3

[0049] Example 3, the hydrolysis conditions of silane have a great influence on the pretreatment effect of metal materials. This example illustrates that this method can be used to evaluate and screen the optimal conditions for silane hydrolysis. Take the aqueous solution containing 0.6% KH-550 and hydrolyze it for different time and act on A under the same pretreatment condition 3 The surface of the steel, measuring the change of its impedance spectrum with the immersion time (2.5% Na 2 SO 4 The aqueous solution is a corrosive medium, at room temperature, and the impedance spectroscopy measurement conditions are the same as example 2), and then analyzed by this method. Different hydrolysis time corresponds to the characteristic frequency of discrete element extremum (f *min) is shown in Figure 7 (measured after soaking in a corrosive medium for 4 minutes), the dotted line in the figure indicates the sample without silane treatment. It can be seen that the silane film forme...

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Abstract

This invention relates to surface properties of metallic materials EIS analysis. mCRR the transmission line model is firstly used to fit the electrochemical impedance spectrum measured under the conditions of satisfying causality, stability and linear, where m is a positive integer, C and R represents respectively pure capacitance and pure resistance; then the characteristic frequency f* of every Ci and Ri parallel branch is calculated respectively according the formula f*=1 / (2 pi CiRi) and the logarithmic chart of discrete parameters Ci and Ri distribution variable along to characteristic frequency under different serial research conditions and the chart of Ro variable to research condition. Finally, the characteristics difference of surface properties of metallic materials is determined according to chart characteristic.

Description

【Technical field】 [0001] The present invention relates to an electrochemical impedance spectroscopy comprehensive analysis method for analyzing the surface properties of metal materials under the influence of different factors, so as to identify the differences in the surface states of metal samples. These different influencing factors include pretreatment conditions, corrosion potential, dielectric concentration and composition , system temperature and sample immersion time, and the differences in sample performance include cleanliness, wettability, corrosion activity, dielectric properties of surface oxide film or pretreatment film, film integrity and compactness. 【Background technique】 [0002] In many cases, a convenient and fast method is needed to comprehensively evaluate the surface properties of metal materials, such as various links in the production process of formed foil, the monitoring and control of the effect and quality of metal material surface pretreatment in...

Claims

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Application Information

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IPC IPC(8): G01N27/26
Inventor 孙秋霞
Owner SHAOGUAN COLLEGE
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