Find other method of Chrome plating Process:
Bright chrome plating is the final chrome on the surface layer, while beneath of chrome plating can be other kind of plating like copper plating, nickel plating, semi bright nickle plating, micro porous nickel and the final coat is chrome plating. But the usual plating is use nickel plating as base of chrome plating because chrome easier to coat on the nickel plating and easier to be a bright plating.
Other reason of using nickel plating beneath of chrome plating because nickel have better characteristic of stand to corrode and can be plated in thick plating compare with chrome plating. The ratio of thickness and measurable difference in electrochemical potential of semibright nickel layer to bright nickel layer is designed to improve the corrosion resistance. By using a chrome brightener the end result of bright chrome plating can be in perfect result.
Bright chrome plating over the nickel plating can result a mirror bright chrome plating, the appearance can reflect like a mirror. More bright of chrome plating then more reflective the surface of chrome plating of the surface finished. Nickel plating has a white finish and the chrome plating which deposits chromium has a clear translucent finish which is hard and scratch resistant.
The thickness of chrome plating is driven by current electricity so the metal deposit can vary in thickness depend on the electric current. Nickel plating beneath the chrome plating make the thickness of chrome is no need to make thick, usually the thickness of chrome plating is setting in thin thickness because if chrome plating is too thick usually easily to crack. Beside bright chrome plating, the piece can be made for hard chrome plating and decorative plating or black chrome plating over nickel plating. This make the finished object can be vary depend on the purpose of plating on the base metal.
Showing posts with label chrome plating. Show all posts
Showing posts with label chrome plating. Show all posts
Saturday, November 25, 2017
Sunday, November 19, 2017
Corrode on Chrome Plating
Chrome Plating (responsive)
Even chrome plating is stand to corrode but this stand is not forever, there is a limited time of chrome plating can stand to corrode. After long time no use the surface of chrome plated can be corroded by the reaction with the air in atmosphere. How long it can stand to corrode, depend on the atmosphere environment, if your atmosphere contain many corrosive substance like in around chemical plant, chrome plating may can’t stand for long, it may only 6 months the surface already have many spot of corrode or rust. As on my experience that chrome plating in the room with bad environment surround the house, the surface of chrome plating can only stand for a year, and the surface of chrome already spot yellowish and brown.
When the surface begin to corrode, actually it can happen on the surface of chrome layer or can be corrode on the base metal, because of the chrome layer already scratch make base metal of chrome layer become corrode. If rust happend on the base metal it can’t be removed permanently and need totally clean off the surface and re coating again. If only chrome layer become rust it can be removed by several method using:
The rust surface is washing with water first then with soap to clean any oil mater on the surface, and the rust will be seen more clear. Use chrome polish paste for the rust area evenly, then rubbing with steel wool to rubbed all the surface especially to the rust surface. Then clean the polished paste with satin cloth to make bright surface and removed all polished paste on the surface. Clean paste with water and check again if spots already gone, if not yet repeat again with polished paste on the spot surface.
Even chrome plating is stand to corrode but this stand is not forever, there is a limited time of chrome plating can stand to corrode. After long time no use the surface of chrome plated can be corroded by the reaction with the air in atmosphere. How long it can stand to corrode, depend on the atmosphere environment, if your atmosphere contain many corrosive substance like in around chemical plant, chrome plating may can’t stand for long, it may only 6 months the surface already have many spot of corrode or rust. As on my experience that chrome plating in the room with bad environment surround the house, the surface of chrome plating can only stand for a year, and the surface of chrome already spot yellowish and brown.
How to clean the rust on chrome plating
When the surface begin to corrode, actually it can happen on the surface of chrome layer or can be corrode on the base metal, because of the chrome layer already scratch make base metal of chrome layer become corrode. If rust happend on the base metal it can’t be removed permanently and need totally clean off the surface and re coating again. If only chrome layer become rust it can be removed by several method using:
- Chrome cleaner/polished paste
- Fine steel wool
- Rubber gloves
- Water
- Soft cloths
The rust surface is washing with water first then with soap to clean any oil mater on the surface, and the rust will be seen more clear. Use chrome polish paste for the rust area evenly, then rubbing with steel wool to rubbed all the surface especially to the rust surface. Then clean the polished paste with satin cloth to make bright surface and removed all polished paste on the surface. Clean paste with water and check again if spots already gone, if not yet repeat again with polished paste on the spot surface.
Example of Corroded on chrome surface
Tuesday, November 7, 2017
Power for electroplating
Electroplating need DC power source that can supply DC electric current in stable flow. For industrial company this may can supply by high power system that already make with perfect electric circuit, so DC electric current is not a problem anymore. For small uses like home industry this can be problem because their electric circuit sometimes is not perfect so that the current flow is not stable, in our country this always problem because electric source that supply from government still don’t stable the range is too far for example from 170 volt to 210 volt, this can make difficult to arrange even use current controller.
The quality of deposit coated metal such as in chrome plating is very dependent on the electric stability. The brightness and the regularity of thickness can be not even if the electric source is not stable flow. For small part may can result in evenly coated thickness but for wide part this can be problem if electric current flow is not high enough or less from the limitation. The DC current electric source should be able to supply electric current 5 A per sq ft of object to coat by chrome ion. If the electric current up and down to wide span, this can be difficult to arrange.
So the problem on chrome plating itself is not just from the preparation of base metal such as electropolishing but also from the DC current electric flow also should be stable. If any certain disturbance while running process the chromium deposit can be very brittle or too soft, out of the standard quality.
The quality of deposit coated metal such as in chrome plating is very dependent on the electric stability. The brightness and the regularity of thickness can be not even if the electric source is not stable flow. For small part may can result in evenly coated thickness but for wide part this can be problem if electric current flow is not high enough or less from the limitation. The DC current electric source should be able to supply electric current 5 A per sq ft of object to coat by chrome ion. If the electric current up and down to wide span, this can be difficult to arrange.
So the problem on chrome plating itself is not just from the preparation of base metal such as electropolishing but also from the DC current electric flow also should be stable. If any certain disturbance while running process the chromium deposit can be very brittle or too soft, out of the standard quality.
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