Metals & Chemicals

Anodising is the procedure by which the natural film on aluminium is very much increased in thickness. The metal is on the anodic side of the galvanic series. Its position is alike to zinc and magnesium, i.e. it is readily oxidised. This oxide on aluminium is physically corrosion resistant, abrasion resistant, very hard, an insulator and very tenacious. In its natural form the oxide film is less than 0.50 microns thick. Since the naturally occurring film is so thin and attached to a soft supple metal, it is easily damaged. So building up this coating will provide very useful properties for the aluminium anodising on Dallas. Preparation The very basis of every excellent coating is preparation. In anodising, good preparation is necessary. Oils and greases are removed in weak alkali solutions and the exterior is etched to remove heavy oxides. After rinsing, the aluminium metal is dipped into a desmut solution so as to remove the insoluble components of the aluminium which remains on t...

The extensive use of zinc, both as a sacrificial coating on steel and also as a stand-alone material, require a high level of corrosion resistance in order to increase the product life cycle and to avoid ecological pollution by metal ions. Zinc coatings and castings on steel can be anodized so as to produce a tough and stable coating. The corrosion resistance is said to be superb. Being used by the military immersed on the subs for high corrosion problem areas such as mooring cleats with good results. A special zinc anodizing handling is available for zinc castings. This coating is entirely different than that for aluminum alloys. Anodizing zinc is a practical coating providing maximum corrosion resistance in both atmospheric and marine environments. As the process uniformly coats deep recess and threaded areas, anodized zinc alloy castings could serve as an economical alternative when replacing traditional bronze, brass and stainless steel components. Steel items could be fabricat...

Chromate Conversion on Houston like Alodine or Iridite is a chemical treatment for aluminum used to present corrosion protection and also surface preparation for paint and other adhesives. Chromate is a superb treatment for paint or adhesives as it greatly enhances the product's ability inorder to form a bond with the aluminum. It is often used on electrical and electronic equipment as it provides increased corrosion resistance even as remaining electrically conductive. The oxide film formed by this process varies in color, depending on the aluminum alloy that is being treated, surface conditions, and type of chromate. The key benefits of alodine are. 1. It resists corrosion. It is indicated that the alodine treated surface withstands corrosion in a five percent of salt spray test for 168 hours. Results vary depending on the alloy of the material and surface finish. 2. Alodine is an outstanding paint base. As the coating is not applied electrically and could be applied quickly,...

Plating and anodizing chemicals includes metal salts, formula additives, anode materials and other consumables for the electrodeposition or electroplating of the metal films or anodized layer formation. Electrodeposition is the process which deposits a metal at the cathode from the solution of its ions. Plating and anodizing chemicals include chrome stripper solutions, immersion plating solutions, as well as brush plating accessories and platinized titanium anode meshes. Whereas for electroplating applications, plating and anodizing chemicals these include the electrode to be plated, a plating anode to complete the circuit, an electrolyte that contains the metal ions to be deposited, and direct current power source. Anodizing chemicals and supplies are widely used in electroplating, electrophoretic, electroless plating, metal spraying, and vacuum metallization processes. Electroplating places the substrate in pot of metallic salt solution and pass an electric current through the co...

The practice of anodizing, or the controlled oxidation, of aluminum and its alloys are more than seven decades old. The main intention behind anodizing aluminum and its alloy parts is to guard the highly reactive surface against corrosion in aqueous environments, like moist air and sea water. Since the anodic coating could be produced in a range of colors, the painted parts are generally used in architectural applications. Further, as the process of aluminum anodization on CA would produce a hard ceramic covering, harder than that of the substrate from which it is formed, the anodic coatings are also used to shield aluminum parts from abrasions, especially sand abrasion. Traditional anodizing process is electrochemical oxidation. The part which is to be anodized is then connected to the positive terminal of a Direct Current (DC) power source and a non reactive metal, like stainless steel, is coupled to the negative terminal. The aluminum anode, and the stainless steel cathode are...

Being an amazing metal, aluminum is one-third the weight of the steel, will not burn, is not magnetic, and has a high inherent resistance to corrosion, and will get stronger as it gets colder. Of the common metals, on the weight basis, aluminum is the most efficient thermal conductor. Since its introduction to the world, anodizing has been recognized as a valuable medium for extending the life of aluminum. Anodizing will enhance the use of this metal as a lightweight and attractive manufacturing component. While the science of anodizing aluminum is well known, the real practice of anodizing - and the resultant finished product - frequently varies between one anodizing company and other. So, the most important thing you all should know about this is how to choose the aluminum anodizing on CA Company that is most capable of delivering results that are acceptable to you and your firm. To understand the anodizing company selection process, a basic knowledge of the aluminum anodizing p...

In the chromate conversion process, part of the metal surface is converted to a superficial layer containing a complex combination of chromium compounds. The chromate film will be soft when freshly formed, but once it gets dried and aged, the layer becomes more rough resistant. Chromate conversion coatings provide excellent corrosion resistance. Paint, polish, and organic finishes will bond exceedingly well to chromate conversion coatings. Additionally, the chromate coatings will prevent loss of plain adhesion due to under film corrosion. The most common use for chromating is to impart corrosion resistance to zinc aluminium parts and zinc plated steel. These films will vary in color depending upon the chemicals being used and the bottom metal being coated. Colors vary from clear, to light shining, to gold. Greater corrosion protection is given with formulations that gives a golden color, since these coatings tends to be thicker. A multicolored appearance will be obtained when the b...

Chromate conversion on Chicago coatings are a type of conversion coating which is applied to passivate zinc, aluminum, cadmium, silver, copper, magnesium, tin and their alloys to slow corrosion. The process involves the use of various toxic chromium compounds which might include hexavalent chromium. The industry is now developing less toxic alternatives so as to comply with substance restriction legislation. One option is trivalent chromate conversion which is less environmentally damaging. Chromating is normally used on zinc-plated parts to defend the zinc from white corrosion, which is mainly a cosmetic issue. It can't be applied directly to steel or iron, and it does not enhance zinc's anodic protection of the underlying steel from brown corrosion. It is also most commonly used on aluminum alloy parts in the aircraft industry where it is often called as chemical film. It also has an additional value as a primer for subsequent organic coatings, as any untreated metal, esp...

Chrome is a metal, but it is not useful for solid or pure substance. Chrome really means that it has a thin layer and a plating of chrome on the object (the bulk of the object has steel, but sometimes brass, aluminium, copper, plastic or stainless steel). People generally think that any shiny finish is chrome even when it has nothing to do with chromium. For example, electro polished stainless steel boat rigging, shiny painted wheels, vacuum metallized balloons and helmets, brightly polished aluminum motorcycle parts, are sometimes called 'chrome' by the common person. Chrome plating is bluer, reflective and more specular than other finishes. If we put one end of the yardstick in a bright finish then the clouds reflection can be seen in the chrome plating.

There are two types of chromium plating; one is industrial and the other being decorative. Industrial chromium plating is divided into two such as hexavalent and the other being trivalent plating. The decorative plating is a mixture of chrome and nickel. It has a mirror finish. Its thickness range from 0.002 to 0.020 miles. In jewelry, plastic knobs, hardware and hard tools the decorative chrome is used. The process for hexavalent chromium is first the activation bath is done, and then chromium bath then it is rinsed twice. While using activation bath a separate tank of chromic acid is used. Occasionally the activation step takes place in the chromium bath itself. Other than bath the other important things that matter are temperature and current density. These two affects the brightness and coverage. Trivalent chromium plating process is divided into three such as the single electrolyte bath is done then sulfate based bath using shielded anodes and at last sulfate ba...