2, chemical plating chemistry is silver-gilt it is a kind of chemical and reductive process, the catalysis that relies on reducer is reductive and continuously deposit is silver-colored, it is report thereby silver-gilt creation condition.
(1) chemistry is silver-gilt solution of recipe silver-colored ammonia: Game Mei?1.6g/100m1;KOH:0.8g(100nml(ammonia water is moved clear) fluid of natrium of; tartaric acid Potassium: 1.5 young 00m1; temperature: 15-209C; time: 10-15 minute.
(The content of the ammonia in silvering solution of 2) influencing factor plating is high, the initial rate of chemical plating is reduced, the temperature that the stability of Dan Rong fluid and film add thick; solution crosses Gao Zeyin in fluid of many analyse Yu Rong, too low a deposition rate is too slow, influence work efficiency. Chemical plating time is lengthened theoretic can reduce plating resistor, but 10-15 minute already amounted to a requirement, increase resistor to reduce again finite.
3, eletroplate
(1) report;KCN65-80 of L35-40 of evil of A of plating silver-colored recipe needs silver-colored salt content passes low, the upper limit of cathode current density drops, content of silver-gilt speed slow; is exorbitant, although silver-gilt rate is rapidder, but film is coarser, also go against the stability of solution. The experiment chooses A evil L and KCN to eletroplate fluid advocate salt, pure board for positive pole, cathode current density is 0.1 one 0.5A/dm’ , at undertaking eletroplating below 25 ℃ .
(2) note
Chamfer of * electrified person, prevent to produce the phenomenon that show model.
* maintains very good conductivity, if the contact is undesirable, can produce the phenomenon that plating does not go up or chemical film corrodes.
* maintains solution cleanness, affect plating otherwise the surface is bright and clean degree.
* is forbidden pound with tall electric current, can produce stripe otherwise the film of piebald shape and destroy solution.
What dip shines or the method of electrochemistry passivation raises film can be use to fight after * eletroplates corrode ability.
Previous 1 2 3Next