Watch plating common sense

- Oct 23, 2017-

With a lot of metal products, in addition to the need to use the original color, the basic will use the plating process does not increase the appearance of the product properties, in the watch factory is no exception, often using electroplating process, the following is the watch factory used electroplating process introduced:

 Electroplating is the process of plating a thin layer of other metals or alloys on some metal surfaces by electrolysis. It is a process that uses electrolysis to adhere the surface of a metal or other material to a metal film. Corrosion, improve wear resistance, conductivity, reflective and enhance the role of aesthetics.

  Electroplating in the RoHS standard of six harmful substances: lead Pb, cadmium Cd, mercury Hg, hexavalent chromium Cr6 +, PBDE PBDE, PBB PBB, content can not exceed 100PPM, the US market Pb lead content can not exceed 70PPM.

RoHS is the abbreviation of "the Restriction of the use of certain hazardous substances in electrical and electronic equipment" in electrical and electronic equipment.


RoHS four tests:

1.RoHS single detection of cadmium (Cd)

2.RoHS single test lead (Pb)

3.RoHS single detection of mercury (Hg)

4.RoHS single detection of hexavalent chromium (Cr6 +)


ROHS six tests:

1.RoHS detection PBB polybrominated biphenyls

2.RoHS detection of PPBDE polybrominated diphenyl ether

3.RoHS detection PAHs polycyclic aromatic hydrocarbons (16PAK)

4.RoHS detection of phthalates

5.RoHS testing REACH-SVHC test


Electroplating mainly divided into water and vacuum plating.

First said that the water plating, water can be plated white steel color, gold, rose gold, gun color, brown and so on.

Water-plated white steel color has the following process:

1. Nickel-free white copper tin: Cu bottom + Ni bottom (EU market can not add) + CuSn (white copper tin)

2.PNP: Cu bottom + Pd + Ni (EU market can not add nickel)


3.PCP: Cu + Pd + Co (cobalt)

4.PDP: Cu bottom + Pd (pure palladium, 80% or more)


5. White Chrome: Cu Bottom + Cr3 + (Trivalent Chromium)


 Note: foreign friends like to say that silver color, we reported to the guests should be chrome color.


Water-plated gold has the following process:

1. imitation gold: Cu bottom + Ni bottom + imitation gold material

2. Acid: Cu bottom + Ni bottom + gold cyanide potassium (highly toxic)


Rose gold: Cu bottom + rose gold material + protect water

Nickel gun color: Cu bottom + Ni bottom + nickel cobalt + protected water (or lattice)

No nickel gun color: Cu bottom + tin cobalt + protective water (or lattice) Note: tin cobalt gun color than nickel cobalt gun color lighter

Brown: Cu bottom + lattice + material (not clear what kind of material)

Vacuum plating technology points:

White IPS: 1) alloy case / copper shell + Cu bottom + Ni bottom + CuSn (white copper tin) into the vacuum plating color, this method added Nickel can not enter the EU market.

       2) alloy case / copper shell + Cu bottom + Pd into the vacuum plating color.

       3) steel shell without plating, directly into the vacuum plating color.

    Gold IPG: 1) alloy case / copper shell + TiN (titanium nitride) + acid into the vacuum plating color.

        2) steel shell without plating, directly into the vacuum plating color.


In addition to the two are IP gun color, IP black, IP rose gold, IP brown