ADDRESS
-
Address: 67/2, Sri Jaganath Industrial Estate, Athipalayam Road,, Chinnavedampatti(P.O),
Coimbatore, Tamil Nadu 641049. - Email: info@arunncoats.in, arunncoats@gmail.com
- Phone:+9194439 11225, +91 77082 22181
ZINC ELECTROPLATINGThe greatest enemy of all types of metal is rusting and corrosion. The corrosive effect of rust is very destructive. Reports from various institutes show that the cost of losses in the United States alone on rusting is about $276 billion each year and a global figure of about $1 trillion. The industries affected by this devastating effect of rusting includes manufacturing, production, transportation, etc. Zinc electroplating is used to stop rust and corrosion.
Zinc electroplating is made of several colours, but each colour is as a result of the methods of formation that is used which means that the effect of corrosion and rusting property differs from each other.
This zinc coating is generally useful in the automobile industry and produces a high level of resistance against rusting.
It is a black oxide and can be a greyish green colour, or as a natural black coating. The greyish green colour will usually produce rusting resistance that is slightly better.
This type of coating formulation tries to produce some amounts of rusting protection, although it is viewed as more efficient environmentally.
The acid zinc coating varies from other forms of zinc coating since cyanide is not added to the coating bath. Zinc acid has a significant edge that is useful when it is used on difficult substrates. A testing method the American society set up has a pattern for classifying zinc which is by corrosion level of resistance a zinc electroplating can provide to the underlying metal. This helps individuals and industries to determine the ideal and best zinc coating for metals. There are about four various levels of layer which ranges from mild indoor coating to very suitable coating for outdoor environments. The greater the zinc coating thickness, the higher the protection against corrosion.
There are two basic methods used for zinc electroplating, and they are rack and barrel zinc electroplating methods. In the use of the rack method, the parts are attached to a machine during electroplating to hold them and prevent them from being damaged. In the case of Barrel zinc electroplating, the elements are placed inside a unique vessel which contains the plating bath. During the plating process, the barrel is moved slowly as the parts are coated. Rack zinc plating is usually the best choice for little and delicate pieces that cannot hold the tumbling of a moving barrel. While a barrel zinc plating is often cheaper with less labour. It is better used when there are many parts to plate.
Alkaline non-cyanide zinc plating is popular with many of our customers because of its ability to produce cosmetically acceptable deposits and to plate with excellent distribution over complex geometry. We offer alkaline zinc plating in both rack and barrel parts. With increasing environmental restrictions, alkaline non-cyanide zinc will continue to grow, replacing cyanide processes.
This invention relates to a method of producing bright zinc electrodeposits over a wide current density range, which comprises passing current from a zinc anode to a metal cathode for a time period sufficient to deposit a bright zinc electrodeposit upon said cathode; the current passing through an aqueous acidic bath composition containing at least one zinc compound providing zinc cautions for electroplating zinc such as zinc chloride, zinc flu borate, zinc sulfamate and zinc sulphate; chloride, flu borate, sulfamate and/or sulphate anions may be added as salts of bath compatible cautions to provide better electrical conductivity, and containing as cooperating additives at least one bath soluble substituted or un-substituted polyether, at least one aliphatic unsaturated acid containing an aromatic or heteroaromatic group and at least one aromatic or N-heteroaromatic aldehyde.
Zinc is a shiny metal capable of being alloyed with various other metals. One of these is iron. Zinc-iron resembles zinc in colour and other characteristics and both are popular plating metals. Yet, although we perform both types of plating at DeKalb Metal Finishing, some clients actually prefer, zinc-iron plating. They select it more often than straight zinc plating because its properties are more advantageous in several ways including ease of further finishing.
Zinc-iron is an alloy of two metals: zinc and iron. It is the result of zinc plating with the addition of an iron alloy. The content of iron resides between 0.3 and 1.0%. At DeKalb Metal Finishing, our zinc-iron deposits typically contain 0.4 to 0.8% by weight.
The purpose of such product is to improve the existing properties of zinc. Zinc-iron plating works with the substrate metal component to further enhance and improve the properties of the base metal. This gives zinc-iron plated materials some advantages over a non-plated component.
Electro polishing is an electrochemical finishing process that removes a thin layer of material from a metal part, typically stainless steel or similar alloys. The process leaves a shiny, smooth, ultra-clean surface finish.
Also known as electrochemical polishing, anodic polishing or electrolytic polishing, electro polishing is especially useful for polishing and debarring parts that are fragile or have complex geometries.
The process of electro polishing is distinct from passivation, though it is easy to confuse the two processes. Both are non-mechanical, chemical processes, but only electro polishing uses electrical current. Both processes are intended to improve corrosion resistance, although there is some industry debate as to the effectiveness of electro polishing for corrosion resistance. For a detailed review of the distinctions, see Passivation vs. Electro polishing.
Electro polishing can be thought of as reverse electroplating. Instead of adding a thin coating of positively-charged metal ions, electro polishing uses electric current to dissolve a thin layer of metal ions into an electrolyte solution.
Pickling is the removal of any high temperature scale and any adjacent low chromium layer of metal from the surface of stainless steel by chemical means.
Where the steel has been heated by welding, heat treatment or grinding to the point where a colored oxide layer can be seen, there is a chromium depleted layer on the surface of the steel underneath the oxide layer.
The lower chromium content causes lower corrosion resistance. To restore the best corrosion resistant performance, the damaged metal layer must be removed, exposing a fully alloyed stainless steel surface.
Pickling time is longer with higher grades, lower temperatures or more severe heat tint, which is usually caused by poor gas purging.
Passivation is the treatment of the surface of stainless steels, often with acid solutions (or gels), to remove contaminants and promote the formation of the passive film on a surface that was freshly created, e.g., through grinding, machining or mechanical damage.
Passivation works by dissolving any carbon steel contamination from the surface of the stainless steel, and by dissolving out sulphide inclusions breaking the surface. Nitric acid (HNO3) may also enrich the proportion of chromium at the surface. Some chelants also claim to do this.
Common passivation treatments include HNO3 solutions or pastes which will clean the steel surface free of iron contaminants.
Formulations contain up to about 30% HNO3 and may also contain other oxidizers such as sodium dichromate. When used correctly, an HNO3 treatment should not affect the appearance of the steel.
Passivation does not usually result in a marked change in appearance of the steel surface, although mirror polished surfaces should be tested first.