CN104792692A - Corrosive working electrode - Google Patents

Abstract

A corrosive working electrode. It includes a casing, electrodes, wires and filling layers; the casing is made of PVC pipe, and an opening is formed on its peripheral surface; the electrode is arranged inside the casing; one end of the wire is fixed on the outer surface of the electrode by surrounding welding, and the other end penetrates the outer surface of the electrode. The hole is opened to extend to the outside of the shell; the filling layer is located in the space between the shell and the electrode, which is formed by curing the epoxy resin. The corrosive working electrode provided by the invention can be widely used in a large number of experiments, has good electrical conductivity, sealing and testability, stable shell material, and has no influence on the environment in the test process. It has played a key role in corrosive experiments such as stray current corrosion, electrochemical corrosion, and cathodic protection. In addition, the device is not affected by environmental climate and geographical location, and can use different types of electrodes, so it has good versatility.

Description

A corrosive working electrode

technical field

The invention belongs to the technical field of electrochemical corrosion testing, in particular to a corrosive working electrode.

Background technique

At present, the corrosion problem is a major issue, which is related to the development of the national economy. Although the country and relevant departments attach great importance to such problems, some problems such as pipeline explosions still sometimes occur. One of the most important reasons for such problems is Pipe corrosion. Therefore, corrosion research has always been a very important issue, and the research and development of electrodes is an important basis for this research.

The corrosive working electrodes currently on the market have high prices, poor performance, and few types, and cannot meet the needs of various researches. For this reason, it is very necessary to independently develop and manufacture working electrodes.

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a corrosive working electrode.

In order to achieve the above object, the corrosive working electrode provided by the present invention includes a shell, an electrode, a lead and a filling layer; wherein the shell is made of a PVC pipe, and an opening is formed on its circumferential surface; the electrode is arranged inside the shell; one end of the lead is wrapped around The welding method is fixed on the outer surface of the electrode, and the other end extends through the opening to the outside of the casing; the filling layer is located in the space between the casing and the electrode, and is formed by curing epoxy resin.

The electrodes are X70 steel, X80 steel or AL-Mg alloy electrodes, which are cylindrical and arranged concentrically with the casing.

The corrosive working electrode provided by the invention can be widely used in a large number of experiments, has good electrical conductivity, sealing and testability, stable shell material, and has no influence on the environment in the test process. It has played a key role in corrosive experiments such as stray current corrosion, electrochemical corrosion, and cathodic protection. In addition, the device is not affected by environmental climate and geographical location, and can use different types of electrodes, so it has good versatility. In addition, the filling layer formed by curing epoxy resin has good physical and chemical properties, and it has excellent bonding strength to the surface of metal and non-metal materials, good dielectric properties, small deformation shrinkage rate, and product dimensional stability Good, high hardness, good flexibility, stable in acid and alkali and most solvents.

Description of drawings

Fig. 1 is a perspective view of the structure of the corrosive working electrode provided by the present invention.

Fig. 2 is a three-dimensional view of the shell structure in the corrosive working electrode provided by the present invention.

Fig. 3 is a perspective view of the structure of electrodes and wires in the corrosive working electrode provided by the present invention.

Detailed ways

The corrosive working electrode provided by the present invention will be described in detail below with reference to the accompanying drawings and specific examples.

As shown in Figures 1-3, the corrosive working electrode provided by the present invention includes a casing 1, an electrode 2, a lead 3 and a filling layer 4; wherein the casing 1 is made of a PVC pipe, and an opening 5 is formed on its peripheral surface; The electrode 2 is arranged inside the shell 1; one end of the wire 3 is fixed on the outer surface of the electrode 2 by surrounding welding, and the other end passes through the opening 5 and extends to the outside of the shell 1; the filling layer 4 is located in the space between the shell 1 and the electrode 2 , which is formed after curing of epoxy resin.

The electrode 2 is an electrode of X70 steel, X80 steel or AL-Mg alloy, which is cylindrical and arranged concentrically with the casing 1 .

Now the corrosive working electrode method provided by the invention is set forth as follows:

Now take the electrochemical corrosion experiment of jet fuel microorganism as an example to illustrate:

The experimental medium solution is the electrolyte of aviation kerosene and water layer structure, and the electrode is immersed in the water phase under the oil-water interface for research. Take 12 250mL beakers, respectively add 150mL of pure jet fuel and 50mL of distilled water to form a medium solution. Under the conditions of three different temperature gradients of 4°C, 15°C, and 30°C, X70 steel and AL-Mg alloy electrodes were soaked in bacteria-containing and aseptic medium solutions for one week at constant temperature, and the electrochemical test experiment was carried out.

The electrochemical test adopts CHI660D electrochemical system, and the measurement adopts a three-electrode system: the auxiliary electrode is a platinum electrode with an area of 1cm ² , the reference electrode is a saturated calomel electrode (SCE), and the research electrode is X70 steel electrode and AL-Mg alloy electrode. The frequency range of the AC impedance test is 1Hz-100000Hz, the amplitude is 5mV, and the ZSimpWin software is used to fit and analyze the impedance spectrum. Before the electrochemical measurement, the measurement system was stabilized for about 20 minutes, so that the measurement was carried out under the corrosion potential.

Claims (2)

1. A corrosive working electrode is characterized in that: it comprises shell (1), electrode (2), lead (3) and filling layer (4); Wherein shell (1) is made by PVC pipe, and on its circumference surface An opening (5) is formed; the electrode (2) is arranged inside the casing (1); one end of the wire (3) is fixed on the outer surface of the electrode (2) in a surrounding welding manner, and the other end extends through the opening (5) To the outside of the casing (1); the filling layer (4) is located in the space between the casing (1) and the electrode (2), which is formed by curing epoxy resin. 2. The corrosive working electrode according to claim 1, characterized in that: the electrode (2) is X70 steel, X80 steel or AL-Mg alloy electrode, which is cylindrical and concentric with the shell (1) set up.