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WHAT IS THE INDUSTRIAL CHROME PLATING SAID WITH VARIETY OF POTENTIALITY …

CHROME PLATING

Chrome plating is generally classified into hard chrome plating and decorative chrome plating. The former applies hard and thick plating on raw material with steady adhesion. It is called industrial chrome plating in the Japan Industry Standard or JIS.
Generally in decorative chrome plating, copper or nickel plating is applied on raw material as a middle layer, on which thin chrome plating is applied. The intermediate layer (copper or nickel plating), with lower abrasion resistance and less adhesion than chrome plating, inclines easy to be peeled off. There are also cases where chrome plating is applied directly on material for decoration, however technically, it can be deemed as hard chrome plating except that the layer is thinner, and the purpose is different.
Chrome plating is said to have been initiated when Roberto Bunsen succeeded his electrolysis experiment for the first time in 1854, however, its applications have been available for more or less 70 years. Moreover in Japan, the technology had been monopolized for munitions during the world war II, its superior characteristics were not recognized in the civil world. After the war, prevailing in each industrial applications, it has been fully exerting its true value.

KOKA CHROME PLATING

The nature of hard chrome plating widely varies depending on the technology of the factory process, such as for plating solution, and pre/post plating processes.
The Koka chrome plating itself built on the patent, “the method to deposit hard and thick metal chrome plating, ” by Mr. Minoru Araki, the founder of our company. We have built on ever-progressing experience in the applications field, and have developed the technology with R&D for 70 years. Thereby its performance parameters including adhesion, abrasion resistance, and hardness are superior, and stable over time with little variance, and thus typically show superior characteristics over the same technology from other manufacturers.

METAL CHROME VS. HARD CHROME PLATING

Hardness of metal chrome made through melting is relatively soft, at around 200 HV, however, chrome applied by hard chrome plating is very hard. The cause of the intensified hardness said to be (1) some distortion existing in the crystal due to the inclusion of 0.02~0.05% of hydrogen and a little oxygen left in the chrome material which was precipitated from the electrolyte of chromic anhydride solution, and also (2) that the crystallite size is very fine. Since this feature heavily depends on technology, technological superiority is required to maintain it.

KOKA CHROME PLATING AND BASE MATERIAL

Koka chrome plating, without having intermediate plating like other type of plating, enlarges faults of the base material, which become conspicuous and even further intensified on its beautiful surface. Even a fault like a pin hole, a nest, or a crack of microscopic size if existed on the base material surface, it would become enlarged and visible. Therefore, any quality plating is only available with quality base material. Quality materials do not mean expensive materials but faultless of pin holes, nests, or cracks.
Koka chrome plating is applicable to processing almost all kind of metal material, including steel, copper, steel alloy, aluminum alloy, zinc alloy, tungsten, etc.

RESOURSE SAVING / RECYCLE

Industrial chrome/nickel plating can be re-processed as many times as required, and the plated product can be used as new one after reprocessing. This can be a unique resource saving/recycle type of technology, because precious machine parts can be recycled /re-used as many times as desired at low cost with less delivery time.

JAPANESE INDUSRIAL STANDARD FOR INDUSTRIAL CHROME PLATING

The Japanese Industrial Standard (JIS) for industrial chrome plating has been established as JIS8615. Immediately after the announcement, we applied and acquired the certification No. 367158 to indicate.

CHARACTERISTICS OF INDUSTRIAL CHROME PLATING

High Hardness 750 ~ 1,100HV
Abrasion Resistance Extremely high (low friction coefficient)
Friction Coefficient 0.16 (in combination w/ steel)
Friction Coefficient 0.16 (in combination w/ steel)
Corrosion Resistance Extremely high.
Bears almost all acids except for concentrated hydrochloric or hydrofluoric.
Heat Resistance Extremely good.
Hardness would not change for most part up to 400 °C.
Plating Thickness Adjustable from just-to-tint through several millimeters thick
Finish Polishing Super Mirror finishing
Super Mirror Polishing of Ra 0.002μm
Partial Plating Available to a certain extent
Re-plating Peel off old plating and plate again for reuse.
This process can be repeated as many times as required.
Influence on Base Material Not at all due to low temperature process (at around 50 °C)
Adhesion High adhesion available through extremely favorable process condition.
Restore Dimension of Base Material Padding Processing applicable on almost all metal surfaces.
CHARACTERISTICS OF INDUSTRIAL CHROME PLATING

PHYSICAL PROPERTY OF CHROME(CHROMIUM)

INDUSRIAL 3 VALENCE CHROME PLATING (NEW R&D)

Industrial 3 Valence Chrome on Aluminum Roll / Industrial 3 Valence Chrome on Iron Roll

Industrial chrome plating which has many excellent characteristics is electrically deposited in 6 valence chrome solution, however, our social trend is going towards the direction to expel this 6 valence chrome from the environmental protection point of view worldwide. For chrome plating having peerless superior performance, the research to replace the 6 valence chrome with 3 valence chrome has been taken place since before. And at present, 3 valence chrome is replacing 6 valence one in decorative chrome plating of thickness less than 1μm.

For thicker 3 valence chrome plating for industrial use, R&D is in progress worldwide. In Japan, the consortium organized by Musashi Institute of Technology, and participants from Japan Hard Chrome Platers Association, with a subsidy from Kanto Branch of METI, has carried out its basic research for practical application of 3 valence chrome plating using “HOSHINO BATH” developed by Prof. Emeritus Shigeo Hoshino.

Through further research and development initiatives, we are trying to realize the practical application of the environment compliance type of hard chrome plating, which is 6 valence chromium free (or industrial 3 valence chrome plating).

The research results up to now regarding 3 valence chrome plating show nearly equivalent characteristics as the industrial 6 valence chrome plating. Having succeeded in its small and medium scale applications, we are now targeting large-parts application and mass production.


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