Except that the common points of different kinds of plating, chromium plating still has many special features.

1.   The main composition of chromium plating electrolyte is the chromic acid which has strong oxidizability, but not the metal chromium salt.

2.   Because of the low current efficiency, which generally is 13~16% and the highest efficiency can only reach about 23%, plenty of hydrogen will separate out with poisonous spray. In this case, good air suction device and chromium fog inhibitor will be needed. Our HN-701 chromium fog inhibitor has good effect on suppression of chromium fog and can reduce environmental pollution.

3.   A small amount of additional anion such as SO42-, F-, SiF62-, must be added into the solution and the trivalent chromium in solution must also be kept on a certain quantity.

4.   Because of low throwing power, for the parts which have complicated shapes, conformal anode and cathodic protection must be adopted to get good coating.

5.   The required current density is very high, sometimes is dozens of times higher than that of the normal plating process. The voltage of tank is also relatively high during chromium plating process, it usually reaches to 12V or higher, comparatively, others just require 6V.

6.   The temperature and current density are controlled strictly. When remaining the current density unchanged, the temperature can only be changed range from 1 to2℃; when keeping temperature unchanged, the current density just can be altered range from 2 to3A/d㎡.

7.   The anode of chromium plating is not chromium metal, but insoluble anode such as lead, lead-tin alloy or lead-antimony alloy.

8.   Because of the easy passivation of chromium layer, power outage during the plating process is not allowed normally.

The above are the particularities of chromium plating process and these special features make chromium plating process different from others. However, as a kind of plating processes, chromium plating process owns the general rules which are belong to plating processes. We shall get started from production and practice, research and study the whole chromium plating process gradually, learn and master the special and general rules of chromium plating process, so that to make better production. We will share more technology information on our WeChat platform, and looking forward to your attention.

According to the market demand, we have researched different kinds of chromium plating products, including hard chromium plating products, decorative chromium plating products, hexavalent black chromium plating products, trivalent chromium plating products and chromium fog inhibitor, etc. They can satisfy a variety of demands of clients.

Main product recommendations:

1.   HN-82 High speed decorative chromium plating process:

Adopting the solubility and mixed catalyst, it has high tolerance against impurities and easy to operate; has higher current efficiency of cathode and deposition velocity, can operate under high current density; components can be activated well and has wide brightening range; with excellent covering power and dispersive ability.

2.   HN-25 Hard chromium plating process:

Adopting unique formula, no fluoride, it won’t corrode the low current area of the component; it won’t corrode tin-lead alloy anode and is not require special anode material; the current efficiency of cathode is high, can reach 22~26%; has even, fine and bright deposit; has high micro hardness of deposit and good corrosion resistance.

3.   HN-09 Hexavalent black chromium plating process:

Adopting the solubility and mixed catalyst, it is easy to operate; use pb-sn-sb alloy anode to improve the quality of deposit and the stability of plating solution; the coating color is uniform and bright with good covering power and distribution ability; has good corrosion resistance and high-temperature resistance, the black chromium layer won’t change color and get crisp even when the temperature rises to about500℃, has good thermostability; be widely used in protective decorative chromium layer which work for deceasing reflectance or functional layer which has special demand, such as the applications in the area of light industry, instrument, aerospace.

4.   HN-701 Chromium fog inhibitor:

It is a chromium fog inhibitor specially designed for chromium plating. Adding it into tank, it is not only can eliminate the environmental pollution coming from chromium fog, reduce the maintenance costs of exhaust equipment and the dosage of chromic acid, but also can decrease the microcrack degree, improve the chromium layer hardness and promote adhesion.