Although static electricity can not cause as much harm to the human body as electricity, but it does not harm the electronic products, many electronic processing companies have come to a lot of conclusions in the work, but also because the static electricity is troubled, so many well-known Companies invest a lot of money in the anti-static improvement of production workshops and conduct ESD training for employees.
Static electricity comes from the following types:
(1) Contact-separation electrification—When two objects are in contact and the distance between them is less than 25×10-8cm, the electrons of different atoms have different energy levels because of the different ability of different atoms to lose electrons. . Therefore, two layers of charges of equal size and opposite polarity appear on both sides of the interface. These two charges are called double-layers, and the potential difference between them is called the contact potential difference. According to the theory of electric double layer and contact potential difference, it can be inferred that static electricity may be generated when two substances are closely contacted and separated.
Electrostatic sequence - according to the polarity of the electric double layer between two substances, when they are in contact with each other, they are positively charged, they are arranged in front, and they are negatively arranged. They are arranged in sequence and can be arranged in a long sequence. The sequence is called an electrostatic sequence or an electrostatic charge sequence.
(2) Breakage and electrification - After the material breaks, it can cause the separation of positive and negative charges within the macroscopic range, that is, the generation of static electricity. This kind of electrification is called breaking and electrification. The electrification of the solid crushing and liquid separation process is broken and electrified.
(3) Inductive electrification - Charged body A is negatively charged and conductor B is nearby.
Under the electrostatic induction of the electrified body A, positive charges appear at the ends of B;
Since the conductor B is connected to the ground conductor C, the potential of B to ground is still zero;
When B leaves the ground conductor C, B becomes a charged body.
(4) Charge migration - When a charged body comes in contact with a non-charged body, the charge is redistributed, ie, the charge migration occurs and the non-charged body is charged.
When charged droplets or dust impinge on the conductor, charge migration occurs; when gas ions flow on an uncharged object, charge migration also occurs.
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