At present, since the electroplating of ABS plastics, the basic technological methods used in plastic electroplating are as follows: except
Oil coarsening, hexavalent chromium reduction, pre-impregnation, palladium and tin activation, tin hydroxide removal and homogenization.
Learn to pre-plate and deposit nickel (or copper) by electroplating. The process has the following problems: (1) is adopted.
Palladium/tin precious metal; (2) Using HCHO as reducing agent has poor operating environment and is harmful to health.
Kang; (3) adopt copper-related ligands. It is difficult to treat wastewater;
In view of the process control and environmental protection of electroless copper plating, people have been developing it since the 20th century.
Since 1980s, direct electroplating technology has been developed to replace electroless copper plating.
The research departments of China, Japan, Germany and other countries have launched their own research results, mainly
Mainly based on patent reports. In particular, the United States has put forward many methods to omit activation and electroless plating.
Metallization process. This process does not need electroless plating, but electroplating directly.
Methods According to the different conductive substances used, it can be roughly divided into three types: (1 J adopts conductive.
Sexual polymer system; (2) Palladium/tin system of chestnut; (3) adopting carbon black suspension
System: In this paper, polypyrrole is a conductive polymer film, which is formed on the plastic surface.
Based on this, the direct electroplating on plastic surface was studied.
2 test
2 1 direct electroplating process
Workpiece pretreatment, degreasing, roughening, oxidation, neutralization, catalysis and electroplating;
2 2 process conditions
Alkaline solution degreasing: NaOH 10 L. OP5RRD/L, temperature 70℃, time 10min.
Coarsening: RD4 ~ O4 100— 150g/L, concentrated sulfuric acid 100 ~ 150l _ op, with moderate temperature.
7 days at 20-30 ft/min:
Oxidation: inq 70g/l, KOH10g/l, op3ml/l, temperature 80℃, hour.
10 n
Neutralization: Hydrazine Hydrate 6R L EDTA, H: 7, temperature 55-60℃.
5 nfin。
Catalysis: pyrrole 15 r L isopropanol10.50 r l _ sodium p-toluenesulfonate 0 g/l.
P-toluenesulfonic acid 30g/L, sodium fluoride 5g/L, calcium vanadium 5g/L, OP 10 RRD/LJ _ gelatin 2.
The length temperature is room temperature and the time is 10 min.
Electroplating: CuSO4 5h2075g/L H2SO4 (98%)120g/L, thiobenzamide.
0.05-0.01.05-0.020g/l of oxazole, 0.01.05-0.020g/l of sodium dipropyl sulfonate polysulfide,
Polyethylene glycol (6 000) 0.05 ~ 0. 10g/L, NAC 1004 ~ 0. 16g/L, time 20.
rilli]0
Note: (1 J From degreasing to electroplating, every step needs stirring; (2) In addition to the catalytic step
In addition, after each step, rinse with deionized water1-2 min; (3) In electroplating, nylon is used.
Cloth anode
2 3 determination method
Thickness is measured by HX. 2OO micro thickness gauge, and the hardness was measured by HX-2CO hardness tester.
Determination of microhardness tester. Measure the resistance several times with a digital multimeter and take the average value.
Thermal cycle test: heat 1 h at 80℃, quickly cool to 0℃, stand for h, and then.
After heating, cycle 5 times.
SEM surface observation: after cleaning and drying, the catalytic surface and electroplating surface are directly deposited on the surface.
Observe under scanning electron microscope