To prevent the oxidation of the metal terminal material, reduce the contact resistance, increase the solder resistance, increase the wear resistance, impact line electric conduction, the service life of the connector, hardware terminal generally after plating.
The effect of different plating specification, on the terminal, do you understand?
Here is to introduce you to the role of each plating specification: one, the role of the gilded gold plating is a kind of ideal contact material, it not only has good electrical conductivity and thermal conductivity, and in almost any environment, have good corrosion resistance.
Because of these features, the gold in the high reliability used frequently in the use of the electric connector.
But gold is very expensive, because the reason to consider alternative materials.
Second, the role of gold alloy gold alloy has kept many of the features of pure gold at the same time, its price is much lower than the pure gold.
The use of gold alloy has been all kinds of success.
The degree of success is dependent on its fusion agent (
合金剂)
Characteristics and electric connector of working conditions.
Alloy processing will increase resistivity and hardness and reduce the thermal conductivity and corrosion resistance of gold.
Its overall effect,
净效应)
The rise of resistance is small.
But have potential stability in the environment of important.
Gold hardness increase makes the contact of the durability of the coating have been improved, however, gold alloy performance in a range of acceptable use, so they are constantly use.
Three, the role of palladium palladium is also a kind of precious metals, however, in addition to the hardness, its gold with described above many of the important features are not the same.
Compared with gold, palladium has high resistivity and low thermal conductivity, and poor corrosion resistance.
In addition to the lively sex, or polymer formed by palladium catalyst (
catalyst）
The presence of organic vapor, the enrichment of organic vapor (
有机蒸汽)
Set in the palladium surface by friction movement.
The friction polymer or brown powder (
棕色粉末)
Will lead to contact impedance increase.
Palladium hardness is higher than gold, thus improve the durability of the palladium plating contact.
Palladium and price advantages have been extensively used in electric connector, so particularly columnar terminals (
post)
。
But in most cases, the surface of the palladium plating layer thickness is about 0.
1 -
0.
6 microns thickness of gold (
一枚闪光)
。
Four, the role of the palladium alloy palladium alloy used in electric connector there are two.
The first is a palladium nickel alloy, palladium 80% 20% nickel, it is a kind of alloy plating, usually its surface to be coated with a layer of a text.
The second is palladium silver alloy, palladium silver 40% 60%, it is used as a coating metal is also used as the underlying metal contact, its surface is usually coated with a layer of thin solid gold, palladium silver alloy is a kind of Mosaic five spraying material, plating coating contact is in constant cycle (
卷,
-
卷)
Process in order to make full use of the cost effectiveness of this process.
In the seventy s and early eighty s, a lot of efforts are in order to reduce the use amount of electric connector plating cicc, because the price of gold is expensive.
To reduce the area of the gold plating thickness and control of the gold plating and made a great success in the position of the contact point, at minimum cost.
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Want to know more hardware terminal plating?
Please look at hardware terminal plating effect (
Next)
。
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