Tinned copper wire for new energy automobile and production process thereof

Abstract

The invention discloses a production process of a tinned copper wire for a new energy automobile, and relates to the technical field of tinned copper wires. The production process of the tinned copper wire for the new energy automobile comprises the following steps of: annealing the copper wire, and putting the annealed copper wire into a cleaning solution for treatment, the cleaning solution comprises the following raw materials in parts by weight: 8-12 parts of calcium amino acid chelate, 5-10 parts of polyaspartic acid, 3-6 parts of amino trimethylene phosphine, 4-8 parts of polyethylene glycol oleate, 3-7 parts of dipropylene glycol butyl ether, 3-5 parts of cocoanut fatty acid diethanolamide, 6-10 parts of sodium dibutyl naphthalene sulfonate, 2-6 parts of sodium o-nitrophenolate, 3-6 parts of oxidized starch, 1-2 parts of nicotinic acid and 60-100 parts of water; and plating tin on the surface of the copper wire; drying the surface of the copper wire to obtain the tinned copper wire. The production process of the tinned copper wire for the new energy automobile has the beneficial effects that the copper wire is cleaned through the cleaning solution, so that an oxide layer and oil dirt on the surface of the copper wire can be removed at the same time, and the adhesiveness of a tin layer and the copper wire is improved; and as the cleaning liquid does not contain strong acid and strong alkali, pollution to the environment is reduced.

Description

technical field [0001] The invention relates to the technical field of tinned copper wires, in particular to a tinned copper wire for new energy vehicles and a production process thereof. Background technique [0002] Due to its excellent performance and low price, copper is widely used in the fields of electronic information, lubrication, catalysis and metallurgy. But copper is easily oxidized in the air, and the finer the particle size, the more serious the oxidation. In order to improve the oxidation resistance of copper, an inert metal can be coated on the copper surface. Coating the inert metal layer can not only significantly improve the oxidation resistance of copper, but also better maintain its conductivity. In the production of wire and cable, the most commonly used plated wire is tinned copper wire, which is mainly used for conductive cores of rubber-insulated mining cables, rolling stock cables, and marine cables. Although tin is not an inert metal and its pro...

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Problems solved by technology

[0003] The conductivity of copper is 100%, while the conductivity of tin is only 14%. In this way, the conductivity of copper wire with tin attached to it is lower than that of bare copper wire, generally 93-94%. Although it does not affect the use of copper wires, it is also a defect in theory. Therefore, this requires that the tin protective layer should have an appropriate and uniform thickness and a tight connection with copper.

[0004] In the prior art, the surface tin plating process of copper wire is generally divided into hot plating and cold plating. Since the surface of copper wire often has oil stains, water stains, oxidation and other phenomena, the surface of copper wire is not plated with tin or plated The thickness and density are not enough, so no matter the hot-dip or cold-plating process is used, the copper wire needs to be cleaned before the tin plating process to ensure good adhesion between the tin layer and the copper wire

In the prior art, the copper wire is generally cleaned with hydrochloric acid with a concentration of 3-5%, but due to the low concentration of hydrochloric acid and short cleaning time, the oxide layer on the surface of the copper wire cannot be removed well. Therefore, the oil stain on the copper wire cannot be removed, which will affect the subsequent copper wire tin plating process, resulting in a low plating rate

In the prior art, strong acid or strong alkali solution is also used to clean copper wire. Although cleaning with strong acid or strong alkali solution can improve the effect of removing oil and oxide layer, thereby improving the tinning effect of copper wire, it will produce many disadvantages. , such as polluting the surrounding air and environment, easily corroding equipment or raw materials, tinned wire conductors are easily oxidized and yellowed after pickling, etc.

In addition, when the copper wire enters the tin furnace during the hot-dip tinning process, the pickling solution on the surface of the copper wire encounters liquid tin in a high temperature state, causing tin to splash, which not only produces a large amount of tin slag, reduces the utilization rate of tin, but also affects Tin quality

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