Coating : Coated bolts

An in-house Hot Dip Galvanizing facility that functions 100% under BBI QC Department’s surveillance.

Baseline Bolting Industries features an exclusive “Electrolytic Zinc Plating” in-house facility that is equipped to facilitative e quicker deliveries. Besides, it comes completely under the surveillance of the in-house quality control.

The galvanic process involves making a zinc coating on the surface of the product using electrolysis. The process makes use of an aqueous solution combined with electrolysis resulting in a solid zinc deposit, thereby creating a bright and smooth layer. The thickness of the layer differs between 5 and 40 µm; it is probably determined by the density and immersion time at that particular time in the zinc bath.

Baseline Bolting Industries is fully equipped to supply a range of cadmium plated boltings to cater the varied requirements of the customer.

The process of Cadmium plating involves a thin layer of electro-galvanized Cadmium application to metals. It protects the metal against alkaline corrosion. The coating agent’s corrosion resistance is similar to that of a zinc coating. Achromatizing treatment is another method. As a result, Cadmium is still utilized in several special cases in industries like Aviation and Aerospace and Offshore and defense. However, in such cases legal permission is mandatory. For most of the application areas as far as Cadmium is concerned, decent alternatives like zinc plated and yellow passivated have been found.

The in-house Hot Dip Galvanizing facility at BBI is operated completely under the QC Department’s surveillance. All our products are hot dipped according to globally applicable ISO 1461 standard which can be easily compared to the ASTM A-153 standard.

Hot-dip galvanizing fasteners works by means of the centrifuge process supported by increased zinc bath temperature. In the process, the product is fully immersed in a molten zinc bath wherein a large zinc block is well heated to 400° C. In the course of the immersion process, the specific product is coated using a liquid zinc layer. This layer of liquid zinc solidifies the moment the product is lifted from the bath.

Xylan BBI LLC has Whitford, UK as the key supplier of fluoropolymer topcoat.

 Xylan happens to be a fluoropolymer topcoat that is manufactured by the Whitford Corporation. In the 1014 & 1070 coatings, Xylan is capable of high lubricity (friction co-efficient as low as .02) & corrosion resistance of around 1000 hours (ASTM B117) when it is applied over phosphate & up to about 2000 hours when it is applied over electroplating. And, the corrosion resistance of 1400 series is more or less 1500 hours, when it is applied over an appropriate basecoat like zinc electroplating.

This is a galvanic process wherein using electrolysis, a coating of zinc is being deposited on the surface of the product. An aqueous zinc solution is used in this electrolytic process which results in a bright and smooth layer. The thickness of the layer differs between 5 and 40 µm. This layer thickness is determined by the zinc bath’s immersion time and current density.

Dacromet provides exceptional protection when it comes to fastening items (small ones). The best part is that this centrifugation process is completely environmental friendly. First, the products are pre-treated chemically and mechanically. Later in an organic matrix, thin non-electrolytic layers comprising of aluminum and zinc lamellas are applied on the products. Minimal layer thickness is used in order to make ensure best protection.

It is also known as sherardising. This method is used to apply zinc coating to give fastening materials the needed corrosion protection. Products to be sherardised will be in a steel barrel along with the required amount of zinc dust. Later, the barrel is placed appropriately in an oven which is set to about 420° C. In the course of the process, a zinc-iron alloy layer that is approximately 15 – 25 µm thick is formed. The result is tremendous corrosion resistance.

An autocatalytic process, ENP involves depositing a hard & corrosion resistant alloy of phosphorus and nickel on a metallic surface. The yellowish colored metal – Nickel is used to offer a cosmetic finish as well as corrosion protection. In order to provide excellent corrosion resistance, the raw material’s nickel layer should be sealed off and hence, be porous free. In other words, the layer has to be at least 20 µm to maximum 40-50 µm to assure the expected corrosion resistance. Peroxidation of the material may lead to a much thinner nickel layer. The finish of the nickel layer to be applied could be bright, semi-bright or matt. After the process is over, the product can be subject to chrome plating depending on the need.

It is a tumbling barrel process. It involves applying a zinc coating of thickness 3 – 80 µm onto the pre-treated steel surface by tumbling the components using a mixture of zinc dust & tiny glass beads. Post the process, the zinc surface gets passivated or lubricated. Contrast to electrolytic plating, this mechanical plating process does not involve hydrogen embrittlement and hence weakening of the material is not noticed.

A bluish-white metal, Chromium is used to provide decorative finishes along with corrosion protection. In case of decorative chromium plating, a layer of nickel is always first applied. The chromium layer applied over this layer of nickel is thin and offers a different color to the product. For good corrosion resistance, the layer of nickel should be isolated from the environment; so, it should be porous free. In other words, the layer has to be at least 20 µm to maximum 40-50 µm to assure the expected corrosion resistance. Peroxidation of the material may lead to a much thinner nickel layer. In this process of chromium plating, it is the nickel layer that determines the shine of the end product.