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Speaking of electrodes, I believe everyone will not feel unfamiliar. Although it is just a physical concept in the eyes of most people, it is widely used in industrial production and life. For example, sacrificial anodes and aluminum anodes are widely used, but not many people really understand them. Let's take sacrificial anodes as an example, and experts in the industry will give you a detailed introduction.
According to experts in the region who are specialized in the research and development and application of aluminum alloy anodes, if you want to really understand what sacrificial anodes are, you should first start with their performance and performance, and understand some related issues.
From a professional point of view, the anode is gradually consumed with the outflow of current, so it is called a sacrificial anode. This anode is consumed quickly, and the installation location and method must be easy to replace. Low-potential metal materials include magnesium, magnesium alloys, pure zinc, zinc alloys, aluminum alloys, etc. Electrochemical oxidation of metals or alloys. The metal or alloy parts are used as anodes, and an oxide film is formed on their surface by electrolysis.
The metal oxide film changes the surface state and properties, such as surface coloring, improving corrosion resistance, enhancing wear resistance and hardness, and protecting the metal surface. Cathodic protection method of sacrificial anode - primary cell; Cathodic protection method of impressed current - electrolytic cell; How to prepare Fe(OH)2 by electrolysis, Fe connected to the positive pole of the power supply, Fe connected to the negative pole of the power supply, NaOH, NaCI, NaCO3 as electrolyte solution, the anode releases Fe2+, the cathode releases H2 to promote the ionization of water, water cannot be used as electrolyte solution because the conductivity of water is too weak; in the primary cell, NaCI is used as electrolyte solution, Fe absorbs oxygen and corrodes.
The introduction of some issues about sacrificial anode is mainly reflected in the following points:
(1) What is the role of the power supply?
The role of the power supply is to provide uninterrupted current to the cathodic protection system. The power supply mainly includes constant current, constant voltage rectifier, and constant potentiostat.
(2) What is the sacrificial anode cathodic protection system?
The sacrificial anode method is a method of using a metal or alloy with a potential more negative than the metal to be protected to electrically connect with the metal to be protected, relying on the current generated by the continuous corrosion and dissolution of the metal with a more negative potential to protect other metals.
(3) What are the components of the forced current cathodic protection system?
The forced current cathodic protection system mainly consists of power supply, control cabinet, auxiliary anode, coke (carbon) filler, cable, control reference electrode, potential test pile, current test pile, protection effect test piece, electrical insulation device, electrical insulation protection device.
(4) What are the main types of power supply?
In terms of rectification form, there are mainly thyristor, magnetic saturation, and CNC high-frequency switch. Thyristor and magnetic saturation constant potentiostat are large in size, large in ripple coefficient, poor in control accuracy, low in efficiency and difficult to digitize. In addition to the above shortcomings, the output of the magnetic saturation constant potentiostat cannot be controlled below 20% of the rated power. The CNC high-frequency switch constant potentiostat is small in size, small in ripple coefficient, high in control accuracy and high in efficiency.
