Our products: when only quality will do

Hockley Enterprises Essex Ltd is synonymous with first-class products. We have an extensive professional range of items, which all meet stringent manufacturing quality and safety standards. Our reputation is second to none. We always aim high, and we never miss!

 

 

Photo gallery: product catalogue

Just a few examples of our recent products

24 Carat Gold Plating

 

One of this metals greatest advantages is its non-reactive nature. Because of this, gold is immune to corrosion or being damaged by exposure to acids or other chemicals. This can be especially important for chemical or medical test equipment, where the non-reactive nature of gold plated components can ensure accurate test results. It will also help to protect old and precious objects especially silver ones that are much more susceptible to tarnish and chemical attack. When bonded with cobalt, the result is a wear-resistant material. These advantages make gold plating ideal for electrical switch contacts and connector pins where electrical contact occurs.

Silver Plating

 

Silver is a bright finish that has excellent electrical conductivity making it ideal for electrical applications.

Silver normally has either a Nickel or Copper undercoat.

It is resistant to most common acids.

Its conductivity makes it ideal for electronic contacts, other applications include light reflectors.

Cadmium Plating (with colour passivation)

 

Electroplated cadmium is a robust and versatile metallic coating. Cadmium is a soft white metal that, when plated onto steel, cast iron, malleable iron, copper, and powdered metal, functions as a "sacrificial coating," corroding before the substrate material. To enhance the corrosion protection of cadmium plating, chromate conversion coatings can be applied over the plated metal, yielding the familiar gold color.

Cadmium plating offers an exceptional bonding surface for adhesives, such as those increasingly used in aircraft manufacturing, and is the preferred coating for salt-water environments.

Clear Cadmium Plating

 

Electroplated cadmium is a robust and versatile metallic coating. Cadmium is a soft white metal that, when plated onto steel, cast iron, malleable iron, copper, and powdered metal, functions as a "sacrificial coating," corroding before the substrate material. To enhance the corrosion protection of cadmium plating, chromate conversion coatings can be applied over the plated metal, yielding the familiar gold color.

Cadmium plating offers an exceptional bonding surface for adhesives, such as those increasingly used in aircraft manufacturing, and is the preferred coating for salt-water environments.

Zinc Plating (with colour passivation)

 

Zinc is primarily used as a coating for steel and provides excellent corrosion protection, although it can be plated onto other metals.

 

Thicknesses of up to 25 microns are normal and passivation treatments make the plating resistant to finger marking, while also providing a good base for painting.

 

The passivation finishes include Clear, Colour (iridescent), Black and Olive drab.

Clear Zinc Plating

 

Zinc is primarily used as a coating for steel and provides excellent corrosion protection, although it can be plated onto other metals.

 

Thicknesses of up to 25 microns are normal and passivation treatments make the plating resistant to finger marking, while also providing a good base for painting.

 

The passivation finishes include Clear, Colour (iridescent), Black and Olive drab.

Copper Plating

 

The Copper plating process is suitable for plating on steel and Zinc die-castings.

Thicknesses can be in the range of 5microns to 75 microns, depending on the application Copper is normally used as an undercoat for Nickel, Silver or Tin.

Copper plating can be mirror polished, matte finish (dull), satin or have a graining finish.

Heat Treat Stop-off

Steel parts that are to be heat-treated are sometimes copper plated to allow for subsequent “selective” heat treating. After plating (and before heat treating), one or more areas of these parts may be machined to remove the copper plating. During heat treating, the areas of the part without copper will be heat treated while the areas with sufficient copper plating will not be heat treated and will remain more ductile.

 
After the heat treatment process is completed, it is then quite common for any remaining copper plating to be removed (by stripping) from the steel parts.

Chrome Plating

 

Chrome plating is sometimes called nickel-chrome plating because it always involves electroplating nickel onto the object before plating the chrome (it sometimes also involves electroplating copper onto the object before the nickel, too). The nickel plating provides the smoothness, much of the corrosion resistance, and most of the reflectivity. The chrome plating is exceptionally thin, measured in millionths of an inch rather than in thousandths.

 

When you look at a decorative chrome plated surface, such as a chrome plated wheel or truck bumper, most of what you are seeing is actually the effects of the nickel plating. The chrome adds a very slightly bluish cast (compared to the slightly yellowish cast of nickel), protects the nickel against tarnish, minimizes scratching, and symbiotically contributes to corrosion resistance. But the point is, without the brilliant leveled nickel undercoating, you would not have a rust-resistant, reflective, decorative surface.

Chemi-Black Coating (Black-oxide)

 

Black Oxide Coating or Hot Chemical Blacking as it is also known is a chemical conversion coating. Unlike other metal finishings such as Zinc Plating where the coating is applied to the surface of the steel Black Oxide Coating is the result of a chemical reaction between the ferrous metal and the oxidizing salts used in the black oxide solution. This means that where other finishes add to the surface of the metal and increase the dimensions causing for allowances to be made during manufacture, black oxide coating has a negligible effect on the dimensional tolerances of the parts. This is of great benefit where tolerances are quite critical such as screw threads, bearing fits, threaded holes or simply just internal machine parts. Black Oxide Coating offers a small corrosion resistance which is enhanced by the post treatment layer of dewatering oil that we apply. The main benefits of this finish are anti galling and enhanced lubricity for internal machine parts that contact. It also reflects less light than non coated parts which can avoid issues with glare whilst working under bright lights.

Nickel Plating

 

The Nickel plating process produces a ductile, semi-bright nickel deposit.

Nickel is widely used in decorative applications and in industry including the building up of worn or over machined parts.

The Nickel Finish provides a combination of protection against corrosion, resistance to wear, and a tolerance to high temperatures.

The Nickel coating is conductive and is the preferred undercoat to other plated finishes.

Manganese Phosphate

 

Maganese Phosphate is extensively employed to improve the sliding properties of engine, gear, and power transmission systems. The use of manganese phosphated coatings for improved corrosion resistance can be found in virtually all branches of the metal working-industry. Typical examples mentioned here include motor vehicle components in brake and clutch assemblies, engine components, leaf or coil springs, drill bits, screws, nuts and bolts, washers, anti-vibration washers, tools, magnet cores, casting interiors and many other small items.

Tin Plating

 

Our Bright Tin process produces a fully bright finish.

 

In addition to its pleasing appearance, it possesses remarkable corrosion resistance.

 

It has good solder ability, resistance to finger staining and has an excellent shelf life.

 

The Bright Tin process is used extensively in the electrical and electronics industries as well as on a wide variety of hardware, domestic and decorative articles.

Sulphuric Anodising (dyed)

 

The process takes place immediately after anodising when the anodic film is still fresh, uncontaminated and hygroscopic. At this point the piece is lowered into the colour where dye is encouraged to enter the pores, thus changing the film colour. All dyes are then sealed in Prefix and then the anodic film is sealed in a hot seal.

 

Sulfuric acid on aluminium, produce a porous surface which can accept dyes easily. The number of dye colors is almost endless; however, the colors produced tend to vary according to the base alloy. Though some may prefer lighter colors, in practice they may be difficult to produce on certain alloys such as high-silicon casting grades and 2000-series aluminium-copper alloys. Another concern is the "lightfastness" of organic dyestuffs some colors (reds and blues) are particularly prone to fading. Black dyes and gold produced by inorganic means (ferric ammonium oxalate) are more lightfast. Dyed anodising is prefixed and sealed to reduce or eliminate dye bleed out.

 

Sulphuric Anodising

 

The most common form of anodising is sulphuric acid anodising. An anodic film thickness of up to 30microns can be produced, depending on the grade of alloy and end use of the components.

The oxide film produced provides the surface of the aluminium with an extremely hard, durable, corrosion resistant and long lasting finish.


Sulphuric Acid Anodising provides a cost-effective way to enhance the performance and appearance of Aluminium.

Alocrom 1200 (Chromate Conversion)

 

A rapid, non-electrolytic dip process which forms a protective coating on aluminium and its alloys.

It can have either a golden appearance as in Alocrom 1200, or a clear finish as in Alocrom 1000.

Alocrom gives good protection against corrosion and provides an excellent foundation for paint.

Chromating is a chemical process, which does not use an electrical current and results in the surface of the aluminium being converted into a chromate film..

It is electrically conductive and inexpensive to produce; it is ideal for large quantities of small items.

Its uses include general industrial work, electrical components, domestic appliances, car bodies and aircraft parts.

Alocrom 1000 (Chromate Conversion)

 

A rapid, non-electrolytic dip process which forms a protective coating on aluminium and its alloys.

It can have either a golden appearance as in Alocrom 1200, or a clear finish as in Alocrom 1000.

Alocrom gives good protection against corrosion and provides an excellent foundation for paint.

Chromating is a chemical process, which does not use an electrical current and results in the surface of the aluminium being converted into a chromate film..

It is electrically conductive and inexpensive to produce; it is ideal for large quantities of small items.

Its uses include general industrial work, electrical components, domestic appliances, car bodies and aircraft parts.

Hard Anodising

 

Hard Anodising is an electrolytic process used to increase the thickness of the natural oxide film on the surface of Aluminium and its Alloys and produces a very hard corrosion resistant insulated surface.

 

Anodising thicknesses can range from 25 microns to 75 microns depending on the Alloy being processed.

 

The colour can vary from light to dark grey depending on thickness with the option of being dyed black, other colours can be made available upon request.

We can mask off areas where Anodising is not required.

 

A secure contact point is required due to the current needed to produce the Hard Anodised coating.

Chromic Anodising

 

The chromic anodising process is used where a high resistance to corrosion is required, where crack detection is a subsidiary requirement, for the treatment of aluminium assemblies where there must be no corrosion risk from trapped electrolyte (a common problem with sulphuric anodising) and for the production of opaque enamel-like self coloured grey/black finishes for decorative use.

 

 

Iridite Coating

 

The Iridite NCP process offers an environmentally safe, chrome-free passivation treatment designed specifically for aluminium alloys. It applies a highly corrosion resistant conversion coating ideally suited to be painted or left as a stand-alone corrosion resistant barrier.

Iridite NCP offers corrosion protection that rivals conventional chromate conversion coatings when tested in accordance with ASTM B 117, and provides an excellent base for primer or paint, or for other organic treatments when tested in accordance with ASTM D 3359.

Iridite NCP is ELV, RoHS and Weee compliant.

Surtec Coating

 

Provides an environmentally friendly coating that offers excellent corrosion resistance, low electrical resistance and provides an ideal base layer for paint.

Key features include: hexavalent chromium free passivation for aluminium, meets all RoHS test Criteria, it is a non toxic product, has excellent bare corrosion protection with or without paint, also works on alloyed, cast and extruded aluminium and is suitable as pretreatment before lacquering or powder coating.

Stainless Steel Passivation

 

Passivation is a chemical cleaning process that is designed to remove free iron and other ferrous contaminants from the surface of stainless steel parts. By removing the contamination from machining, stamping, etc., you are helping restore the material to the original mill condition and corrosion specifications.

Metal Polishing

 

This involves linishing and polishing the base material to a sufficiently flaw free and smooth surface so as to optimise the finish obtained using our high quality chrome.

Certain materials may be too rough or heavily corroded to enable us to obtain a suitable surface for obtaining the finish you desire and we will advise you of this when you bring it to us.

Linishing involves using rotating abrasive belts in varying grades from quite coarse to very fine as determined by the surface condition so as to obtain a smooth finish on a component.

Polishing uses large diameter mops made of cloth or sisal rotating at speed on a lathe like machine to produce a bright reflective surface.  This process is aided by coating the mops with suitable polishing compounds.

As both linishing and polishing involve high speed rotating machines they should only be done by skilled operatives for safety reasons.

The Stripping and Polishing services can be provided separately if the customer requires or as part of the re-chroming service.

Interested?

We're always happy to discuss our extensive range of products. Contact us on 01702 614067 or use our contact form.