Thursday, July 4, 2019

Nickel Plating

Nickel is one of the most important metals applied by electrodeposition. The plate is used principally as a bright coating underneath a much thinner chromium electroplate to provide a highly lustrous and corrosion-protective finish for articles of steel, brass, zinc die castings, chemically metallized plastics, and, to a much smaller extent, for coatings on aluminum alloy and magnesium alloys. The protection of the underlying metal depends primarily on the nickel plate, with the thin chromium overlay conferring a permanently nontarnishing, hard, wear-resistant surface. To a far lesser extent, and only for mild exposures, thin gold or brass electroplate with a clear lacquer finish is used as a decorative coating on thin bright nickel deposits. Nickel coating alone are also used industrially to afford corrosion protection to prevent contamination of a product. Because of favorable mechanical properties, nickel electrodeposits are used for electroforming of printing plates, phonographs record stampers’, foil and tubes, screens, and many other articles.

The history of the electrodeposition of nickel goes back more than 125 years. It began in 1843 that describe the first apparently sound nickel plate, which obtained from a bath containing nickel and ammonium sulfates. The first do nickel plating on a truly commercial basis used double salt baths, including both sulfate and chloride, and was probably the first to recognize the importance of impurities in the plating bath. He employed cast soluble anode which contained silicon, iron, and carbon. The only early developments that have survived, however, are Weston’s introduction of boric acid into the bath, the use of chlorides and promote anode corrosion, and the discovery about 1912, that cadmium salt act as brighteners. Electrolytic nickel refining profited by the experience of the nickel platter and has made use of warm nickel sulfate-boric acid solution since 1894.


Chromium Alloy Plating

Chromium alloy plating can be considered a subheading under trivalent bath, there is almost no alloy plating possible from hexavalent chromium solutions. There has been a great deal work, and some reviews are available, but nothing of commercial importance seems to have been developed. It appears likely that some fundamental problems of depositing chromium from trivalent baths remain to be solved, and that these are probably not made appreciably easier by introducing the added factor of alloy deposition. Alloy steel is one of good material as base plating metal for chromium electroplating.

One exception to the rule of no alloy plating from chromic acid baths is the work of Vagramyan and his collaborators. Alloys of up to 37% selenium, 15% manganese, 2% molybdenum, and 1 % rhenium were obtained with cold chromium deposits at about 20oC. These alloys are on the whole no longer obtained as the temperature is raised, so presumably they are alloys with the dull hexagonal hydride produced at low temperatures, and not with the bee deposits which form ordinary bright plate.

Much work has been done, mainly in France, to investigate claims of improved wear resistance of chromium-molybdenum alloys produced from chromic acid solutions. It appears that bright deposits generally contain less than 1% molybdenum, and this could possibly result from solution contamination of the deposit instead of alloying. Hard chromium plating baths are frequently a little low in catalyst due to too strict adherence to the 100:1 ratio of chromic acid to sulfate, and the improved wear resistance of deposits from solutions containing molybdenum compounds might be due to an effect on the catalyst balance of the solution.

Other Special Types of Chromium Plate

A "frosty" or satin-finish plate in between cold chromium and bright plate was found desirable for press plates. Such smooth-bubbly or natural rounded nodular plate has been found useful for handling textile materials. Some people used a special cold chromium plate produced in refrigerated electrolytes for printing plates. Black chrome plating can be obtained from immersing chromium deposits in molten cyanide acid.

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Monday, November 12, 2018

The most important step on Electroplating is Preparation

The successful of electroplating process in on the preparation:

Preparation itself can involve on the object that will be treated into the metal plating, the chemical will use to process, the place of doing process and the source of electric to do this process.

Each of matter must be prepare accurately, any problem on the running process can effect to the final result of electroplating process. Preparation of basis metal should be done as the procedure to get perfect result, such as the metal use and the pretreatment to the basis metal before electroplating run.

For using new apparatus should be tested first before do a big project, small piece and many object forms can be tried by electroplating to make sure that the process of electroplating can result a perfect finish object.

Have a nice trial.

Friday, December 1, 2017

Hard Chrome Plating Service

Hard chrome plating applied to many kind of part and use by many customers. Hard chrome plating can be customize to the customer requirements and specifications. Different requirement of hard chrome plating may be vary because each of part have been used in different application that for some customer may need very high spect of hard chrome because of their application need that special treatment like in military plating specifications. Military requirement sometimes difficult to fulfill like chrome in long hollow material like pipe, because electroplating can’t plate in the long hollow. Chrome plating just can do on the near of the end edge of the pipe, this is may need special treatment and special tools to make chrome plating in the hollow pipe can do. Hard chrome plating requirement sometime is not just hard, but also need smooth and bright, and can overcome or avoid of any corrode on surface of chrome plating.

For service company that should meet every requirement of their customer request, must doing continuous training for their customer in order can follow the development of their service and can develop and sometimes need to modify of their process. This improvement can be started by their researcher that usually try on small laboratory for experiment of their new kind of plating process operations. Continuous research and development may need to do in order to meet the requirement of their customers. For old company that don’t doing improvement on their process can be left by their customers because can’t fulfill their requirement that always increase. New innovation and new technology should develop in order can catch all customer requirement and win on the competition of their service. Electroplating service company is already born everyday and high competition will happened to find the winner of this competition, service company that don’t follow the new higher qualification of the product result will be the looser on this competition and finally died.
Chrome Plating (responsive)

Hard chrome customer is very wide and very huge money turn on this business. Almost all Industry need hard chrome plating, tools steel is usually being chrome plated, every shaft of turning equipment is need to coat by hard chrome plating, every hydraulic of certain part big and small is need to coat by hard chrome plating in order can move with smooth and don’t leakage. This is very high market demand on hard chrome plating if you can catch them.

Hard Chrome Plating Product

hard chrome in hollow material
Hard chrome in hollow material

Saturday, November 25, 2017

Chrome Plating over Nickel Plating

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.