Summary of the invention
The object of this invention is to provide a kind of process of surface treatment improving Copper Foil corrosion resistance nature.
Based on above-mentioned purpose, this invention takes following technical scheme:
Improve a process of surface treatment for Copper Foil corrosion resistance nature, comprise the steps:
(1) preparation of electrolytic solution: after complexing agent potassium pyrophosphate, tin protochloride, zinc sulfate and additive A being mixed, water-solublely obtain settled solution, and K in solution
4p
2o
7concentration is 40g/L ~ 55g/L, Zn
2+concentration is 0.6g/L ~ 1.5g/L, Sn
2+concentration is 0.5g/L-0.8g/L, and additive A concentration is 1g/L-1.8g/L, and wherein, additive A adopts at least one in SPS, Trisodium Citrate, Mo, Fe, volatile salt; The chemical name of SPS: sodium polydithio-dipropyl sulfonate (molecular formula C
6h
12o
6s
4na
2).
(2) Copper Foil plating: pretreated Copper Foil is put into the plating tank containing (1) electrolytic solution in steps and electroplate.
Preferably, when electroplating in step (2), the pH of electrolytic solution is 9-12, and temperature is 35-45 DEG C, and passing into galvanic current density on positive plate is 1.2-2.6A/dm
2.
The present invention mainly forms Zn-Sn composite deposite in copper foil surface plating, thus improves the corrosion resistance nature of Copper Foil.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described, but protection scope of the present invention is not limited thereto.
Embodiment 1
Improve a process of surface treatment for Copper Foil corrosion resistance nature, comprise the steps:
(1) preparation of electrolytic solution: after complexing agent potassium pyrophosphate, tin protochloride, zinc sulfate and additive A being mixed, water-solublely obtain settled solution, and K in solution
4p
2o
7concentration is 50g/L, Zn
2+concentration is 1.2g/L, Sn
2+concentration is 1.2g/L, and additive A concentration is 1.5g/L, and additive A is made up of Trisodium Citrate, Fe and volatile salt, and amount of substance is than being 1:2:5.
(2) Copper Foil plating: micron electrolytic copper foil of 18 after alligatoring, solidification treatment is put into the plating tank containing (1) electrolytic solution in steps and electroplate, Copper Foil through the speed of a motor vehicle of electrolytic solution be 35m/min, during plating, electrolytic solution pH is 10.5, and temperature is 40 DEG C, and current density is 1.8A/dm
2, electroplating time is 4s.
The sample room temperature of embodiment 1 is put into corrosive medium (concentration is the NaCl aqueous solution of 5wt%) to test, and record the rust time.
Embodiment 2
Improve a process of surface treatment for Copper Foil corrosion resistance nature, comprise the steps:
(1) preparation of electrolytic solution: after complexing agent potassium pyrophosphate, tin protochloride, zinc sulfate and additive A being mixed, water-solublely obtain settled solution, and K in solution
4p
2o
7concentration is 55g/L, Zn
2+concentration is 1.5g/L, Sn
2+concentration is 0.5g/L, and additive A concentration is 1.8g/L, and wherein, additive A adopts SPS and volatile salt, and amount of substance is than being 7:3;
(2) Copper Foil plating: micron electrolytic copper foil of 18 after alligatoring, solidification treatment is put into the plating tank containing (1) electrolytic solution in steps and electroplate, Copper Foil through the speed of a motor vehicle of electrolytic solution be 25m/min, during plating, electrolytic solution pH is 9, and temperature is 45 DEG C, and current density is 1.2A/dm
2, electroplating time is 7s.
The sample room temperature of embodiment 2 is put into corrosive medium (concentration is the NaCl aqueous solution of 5wt%) to test, and record the rust time.
Embodiment 3
Improve a process of surface treatment for Copper Foil corrosion resistance nature, comprise the steps:
(1) preparation of electrolytic solution: after complexing agent potassium pyrophosphate, tin protochloride, zinc sulfate and additive A being mixed, water-solublely obtain settled solution, and K in solution
4p
2o
7concentration is 40g/L, Zn
2+concentration is 0.6g/L, Sn
2+concentration is 0.6g/L, and additive A concentration is 1.0g/L, and wherein, additive A adopts Trisodium Citrate;
(2) Copper Foil plating: micron electrolytic copper foil of 18 after alligatoring, solidification treatment is put into the plating tank containing (1) electrolytic solution in steps and electroplate, Copper Foil through the speed of a motor vehicle of electrolytic solution be 30m/min, during plating, electrolytic solution pH is 12, and temperature is 35 DEG C, and current density is 2.6A/dm
2, electroplating time is 6s.
The sample room temperature of embodiment 3 is put into corrosive medium (concentration is the NaCl aqueous solution of 5wt%) to test, and record the rust time.
Copper foil sample made by embodiment 1 to 3, test through corrosion resistance nature, the rust time is 350h, 370h and 320h respectively, the rust time is all greatly improved than the Copper Foil (150h) without composite deposite process, adopt the process of surface treatment of the present invention's research and development, form Co and Zn-Sn composite deposite, effectively improve Copper Foil corrosion resistance nature.