CN102383116A - Process method for treating zinc immersion before performing copper plating on surface of superfine aluminum wire - Google Patents

Abstract

The invention relates to a process method for treating zinc immersion before performing copper plating on the surface of a superfine aluminum wire. The process method comprises the following steps of: 1) alkaline leaching: at room temperature, putting the superfine aluminum wire into an alkaline leaching solution for 60 seconds, taking the superfine aluminum wire out and washing; 2) acid leaching: putting the superfine aluminum wire into an acid leaching solution for etching for 60 seconds, then putting the etched superfine aluminum wire into normal-temperature ionized water and washing by using ultrasonic waves for 60 seconds; 3) primary zinc immersion treatment: putting the superfine aluminum wire into a zinc immersion solution for 60 seconds under the condition of room temperature, performing ultrasonic wave treatment at the same time, and putting the aluminum wire into a nitric acid solution with a volume ratio of 1: 1 for partially dissolving; and 4) secondary zinc immersion treatment: putting the superfine aluminum wire into the same zinc immersion solution as that in the step 3) for 40 seconds under the condition of the room temperature and performing ultrasonic wave treatment at the same time. After the aluminum wire is subjected to zinc immersion by using the process method, the surface layer of the aluminum wire is uniform, delicate and compact; a zinc-immersion alloy layer is thinner, the appearance is flat and neat and the zinc-immersion alloy layer has a uniformly dispersed micrpore structure and is favorable for subsequent electrically-deposited metal; and the bonding force between base nickel and a copper-plated layer is increased.

Description

The process method that zinc is soaked in the pre-treatment of fine aluminium wire copper coating

Technical field

The present invention relates to the process method that zinc is soaked in the pre-treatment of a kind of fine aluminium wire copper coating, be used for the art breading of fine aluminium wire before copper facing.

Background technology

Pre-treatment is still generally adopted at present and soaked the zinc method before the plating of aluminium and alloy thereof, and this method has lot of advantages: do not need additional power source, dispersive ability, covering power are fine; Treatment time is short, and equipment is few, and cost is low; Process stabilizing, composition is simple, and is simple to operate; Addition to each composition in the zinc dipping solution also needn't strict be controlled, and coating and aluminium base bonding force are good, are applicable to aluminium and aluminum alloy machinery processing, punching press, diecast parts and batch process.

The staple of zinc dipping solution is NaOH and ZnO at present, and its concentration has very big influence to the zinc-impregnating layer quality, when concentration is hanged down, and the excessive velocities of displacement zinc, the zinc layer is gloomy, surface irregularity, bonding force is poor, and therefore, zinc dipping solution concentration is too low and bad; And concentration change is fast, needs frequently adjustment, and is unfavorable to operating.When concentration was high, the speed of displacement zinc was slower, zinc layer sallow, and glossy, crystallization is careful closely, and is applicable to that multiple duraluminum soaks zinc, and its shortcoming is that soltion viscosity is big, and it is many that the silk material is taken solution out of, increases the burden of cleaning, causes extra waste again.

Summary of the invention

The technical problem that the present invention will solve provides the process method that zinc is soaked in the pre-treatment of a kind of fine aluminium wire copper coating; After with process method aluminium wire being soaked zinc, the top layer is even, careful, tight, and it is thinner to soak zinc alloy layer; Flat appearance; Soak the microvoid structure that zinc alloy layer is even dispersion, favourable to follow-up electrodeposit metals, can strengthen bonding force with bottoming nickel and copper coating.

For overcoming the above problems, concrete technical scheme of the present invention is following: the process method that zinc is soaked in the pre-treatment of a kind of fine aluminium wire copper coating may further comprise the steps:

1) alkali soaks: at room temperature, fine aluminium wire is put into alkali soaked in the solution 60 seconds, take out and put into 60 ~ 70 ℃ of hot deionized waters, ultrasonic cleaning 60 seconds is with deionized water at normal temperature ultrasonic cleaning 60 seconds; Wherein to soak solution be by NaOH 2g, Na to alkali ₂CO ₃30g, Na ₃PO ₄12H ₂O 30g, C ₄H ₄KNaO ₆4H ₂O 5g, Na ₃C ₆H ₅O ₇2H ₂O 5g, sodium lauryl sulphate 0.5g, 1000ml is formulated altogether for water for all the other;

2) acidleach: put in the acid dip solution, etch 60 seconds is put into the normal temperature ionized water then with ultrasonic cleaning 60 seconds; Wherein acid dip solution is by H ₂SO ₄100g, H ₂O ₂1000ml is formulated altogether for water with all the other for 50ml;

3) once soaking zinc handles: put in the zinc dipping solution, room temperature condition was accomplished in following 60 seconds, carried out ultrasonication simultaneously, and then aluminium wire is put in the salpeter solution that volume ratio is 1:1 was partly dissolved processing; Wherein zinc dipping solution is by NaOH 200g, Na ₂CO ₃30g, ZnO 20g, NiSO ₄6H ₂O 30g, FeCl ₃6H ₂O 30g, NaNO ₃1g, C ₄H ₄KNaO ₆4H ₂O 60g, Na ₃C ₆H ₅O ₇2H ₂O 20g, EDTA 20g, 1000ml is formulated altogether for water for all the other;

4) secondary soaking zinc is handled: put in the zinc dipping solution with step 3, room temperature condition was accomplished in following 40 seconds, carried out ultrasonication simultaneously.

Adopt this fine aluminium wire copper coating pre-treatment to soak the step of the process method of zinc, the fine copper wire coating layer surfacing after the processing, thickness is even, and crystallization is careful closely.Simultaneously carry out the adhesion experiment based on GB2927-82 " metal wire rod twines, absent-mindedness experimental technique ", it is good to test surperficial zinc-impregnating layer and matrix bond, flawless, and nothing comes off, no skin effect phenomenon.

Embodiment

Embodiment one

The process method that zinc is soaked in the pre-treatment of a kind of fine aluminium wire copper coating, the diameter of this trickle aluminium wire is the metal wire that is equal to or less than 10mm, may further comprise the steps:

1) alkali soaks: at room temperature, fine aluminium wire is put into alkali soaked in the solution 60 seconds, take out and put into 60 ~ 70 ℃ of hot deionized waters, ultrasonic cleaning 60 seconds is with deionized water at normal temperature ultrasonic cleaning 60 seconds; Wherein to soak solution be by NaOH 2g, Na to alkali ₂CO ₃30g, Na ₃PO ₄12H ₂O 30g, C ₄H ₄KNaO ₆4H ₂O 5g, Na ₃C ₆H ₅O ₇2H ₂O 5g, sodium lauryl sulphate 0.5g, 1000ml is formulated altogether for water for all the other; Can remove the dirt and the sull on aluminium wire surface through caustic corrosion, the aluminium wire surface is corroded into Shamian Island simultaneously, and the machinery that helps forming coating and matrix is with regard to interlock, thus the raising bonding force, because the alkali etch rates is fast, so add C ₄H ₄KNaO ₆4H ₂O and Na ₃C ₆H ₅O ₇2H ₂Complexing agents such as O play corrosion inhibition, and prevent to get in the tank liquor Al (OH) ₃Deposition.Aluminium wire surface after alkali soaks is silvery white in color.

2) acidleach: put in the acid dip solution, etch 60 seconds is put into the normal temperature ionized water then with ultrasonic cleaning 60 seconds; Wherein acid dip solution is by H ₂SO ₄100g, H ₂O ₂1000ml is formulated altogether for water with all the other for 50ml; Metal or the nonmetallic impuritys such as copper, iron, manganese and silicon do not removed when removing dust that aluminium wire at its remained on surface and alkali cleaning through acidleach after alkali soaks expose the metallic crystal structure, prepare activating surface for chemistry soaks zinc.Sulfuric acid has weak etch ability to aluminium, and the wetting whole substrate of ability surface makes the natural oxide film dissolving of aluminium, and greasy dirt is loosening, uses ydrogen peroxide 50 to make oxygenant, the removal dust, and aluminium wire is silvery white in color low-light in the surface after acidleach is handled.

3) once soaking zinc handles: put in the zinc dipping solution, temperature was accomplished under 15～22 ℃ of conditions in 60 seconds, carried out ultrasonication simultaneously, and then aluminium wire is put in the salpeter solution that volume ratio is 1:1 was partly dissolved processing; Wherein zinc dipping solution is by NaOH 200g, Na ₂CO ₃30g, ZnO 20g, NiSO ₄6H ₂O 30g, FeCl ₃6H ₂O 30g, NaNO ₃1g, C ₄H ₄KNaO ₆4H ₂O 60g, Na ₃C ₆H ₅O ₇2H ₂O 20g, EDTA 20g, 1000ml is formulated altogether for water for all the other;

4) secondary soaking zinc is handled: put in the zinc dipping solution with step 3, temperature is completion in 40 seconds under 15～22 ℃ of conditions, carries out ultrasonication simultaneously.

Can find once to soak the zinc processing after accomplishing the foregoing description, it is thicker to soak zinc alloy layer, coarse, porous, and crystallization crystal grain is bigger, and is inhomogeneous.The crystal grain distribution that secondary soaking zinc processing gained soaks zinc alloy layer is than once soaking the more even, careful, tight of zinc processing; It is thinner to soak zinc alloy layer, and flat appearance soaks the microvoid structure that zinc alloy layer is even dispersion; Galvanic deposit to follow-up is favourable, can strengthen the bonding force with bottoming nickel and copper coating.

Claims (1)

1. the fine aluminium wire copper coating pre-treatment process method of soaking zinc is characterized in that may further comprise the steps:

1) alkali soaks: at room temperature, fine aluminium wire is put into alkali soaked in the solution 60 seconds, take out and put into 60 ~ 70 ℃ of hot deionized waters, ultrasonic cleaning 60 seconds is with deionized water at normal temperature ultrasonic cleaning 60 seconds; Wherein to soak solution be by NaOH 2g, Na to alkali ₂CO ₃30g, Na ₃PO ₄12H ₂O 30g, C ₄H ₄KNaO ₆4H ₂O 5g, Na ₃C ₆H ₅O ₇2H ₂O 5g, sodium lauryl sulphate 0.5g, 1000ml is formulated altogether for water for all the other;

2): put in the acid dip solution, etch 60 seconds is put into the normal temperature ionized water then with ultrasonic cleaning 60 seconds; Wherein acid dip solution is by H ₂SO ₄100g, H ₂O ₂1000ml is formulated altogether for water with all the other for 50ml;

3) once soaking zinc handles: put in the zinc dipping solution, room temperature condition was accomplished in following 60 seconds, carried out ultrasonication simultaneously, and then aluminium wire is put in the salpeter solution that volume ratio is 1:1 was partly dissolved processing; Wherein zinc dipping solution is by NaOH 200g, Na ₂CO ₃30g, ZnO 20g, NiSO ₄6H ₂O 30g, FeCl ₃6H ₂O 30g, NaNO ₃1g, C ₄H ₄KNaO ₆4H ₂O 60g, Na ₃C ₆H ₅O ₇2H ₂O 20g, EDTA 20g, 1000ml is formulated altogether for water for all the other;

4) secondary soaking zinc is handled: put in the zinc dipping solution with step 3, room temperature condition was accomplished in following 40 seconds, carried out ultrasonication simultaneously.