cathode

[yīn jí]

Terminology of electrochemical reaction

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The cathode is electrochemical reaction A term for. It refers to the pole of the electron, that is Reduction reaction The pole of. stay Primary battery Medium, cathode is positive electrode ； Electrons are negative pole The current flows from positive to negative. In solution cation Move to the positive pole, and the anion moves to the negative pole. stay Electrolytic cell The middle cathode is connected with the negative pole of the power supply. The cathode is always connected with anode (Anode) exists correspondingly.

Chinese name: cathode

Foreign name: cathode
Role: One pole in galvanic cell/electrolytic cell

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three Concept and measures of cathodic protection

Composition of negative pole of primary battery

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Negative pole: oxidation reaction occurs

The electrons are released from the negative pole External circuit Flow into the positive pole along the wire, electrolyte Cations in the solution move to the positive electrode, and electrons on its surface are reduced to form a Closed loop 。^[1]

a. Metals with different activity. The metal with strong activity is the negative electrode - zinc copper primary battery, zinc As negative pole, copper As positive pole; b. Metal and non-metal (non-metal must be able to conduct electricity), and metal is the negative pole—— Zinc manganese dry battery , zinc as negative electrode, graphite As positive pole;

c. Metal and compound, metal is negative electrode—— Lead storage battery ， Lead plate As negative pole, Lead dioxide As positive pole;

d. Inert electrode , in essence, hydrogen is negative pole —— Oxyhydrogen fuel cell The electrodes are all platinum.

Composition of negative electrode of electrolytic cell

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electrolysis : Make the current pass through electrolyte solution However, the process of redox reaction is caused at the yin and yang levels.

Electrolytic cell : With Redox reaction , device that converts electric energy into chemical energy, such as electrolytic saturation Salt water 。

Cathodogenesis Reduction reaction

The electrons flow from the negative pole of the external power supply to the cathode of the electrolytic cell, and then flow back from the anode to the positive pole of the power supply.^[2]

Cathode: connected to the negative pole of the power supply. The cation in the solution is responsible for the reduction reaction on the cathode. When there are many kinds of cation When, press Metal mobility The more inactive the metal is, the more cationic Oxidizability The stronger it is, the easier it will be restored. stay aqueous solution The cations of the metal before aluminum cannot be reduced.

Concept and measures of cathodic protection

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Definition 1: By reducing corrosion potential Obtaining anti-corrosion effect Electrochemical protection method. Applied discipline: ship engineering (first-class discipline); Corrosion and Protection of Ships (Secondary Discipline)

Definition 2: Use the protected metal as cathode and apply external current Cathodic polarization , or with Electrochemical sequence Low corrosive metal sacrificial anode To reduce or prevent Metal corrosion Method. Applied discipline: marine science and technology (first-class discipline); Marine technology (Secondary discipline); Seawater resources development technology（ Tertiary discipline ）

Definition 3: By reducing corrosion Potential. Applied discipline: mechanical engineering (first-class discipline); Corrosion and protection (secondary discipline); electrochemical corrosion (Third level discipline)

Cathodic protection technology It is a kind of electrochemical protection technology. Its principle is to apply an impressed current to the surface of the corroded metal structure, and the protected structure becomes the cathode, so that Metal corrosion Occurring Electron migration It can be inhibited to avoid or weaken corrosion.^[3]

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