RATTAN IRON WORKS (RIW) is a flagship Screws Manufacturers in Delhi, India. For best price call up today +91-9911251063. Platings and finishes affect not only how a Screw or Bolt looks, but also how it will withstand corrosion—deterioration of the metal—due to exposure to the weather or chemicals. Below You’ll find all of the popular platings and finishes in India at RATTAN IRON WORKS (RIW).
Electroplating, which is also commonly known as zinc plating, is a thinner (Normally 0.2 miles thick). Electroplated Screws/Bolts are typically plated in yellow or clear zinc. The yellow zinc produces a yellow/muted gold finish, while the clear zinc produces a bright, silver finish on the Screw/Bolt. Mostly the benefits is providing corrosion resistance. It is also less expensive than some other types of coatings.
To begin the process, workers clean the Screw/Bolt with alkaline detergent solutions before being treated with acid. This removes any rust, oils, or other impurities on the surface of the Screw/Bolt. Once cleaned, the electroplating process begins through electro deposition, or sinking the Screw/Bolt into a zinc bath. There, the direct current is sent through the chemical bath, creating a chemical reaction on the Screw/Bolt, thus electroplating it. For more technical details please feel free to contact at RATTAN IRON WORKS (RIW) the flagship screws manufacturers in Delhi, India.
HOT DIP GALVANIZING (HDG)
Hot Dip Galvanizing is among the most popular coating generally in Bolts because of its extended durability, having the strength and corrosion protection of the zinc-iron coating. The zinc saves the base metal by acting as a barrier to corrosive elements, and the sacrificial nature of the coating results in a long-lasting and high-quality steel product. The hot-dip galvanizing process consists of three steps: surface preparation, galvanizing, and inspection.
- Surface Preparation: For high quality hot-dip galvanizing, material must be properly prepared prior to being sinked in a bath of molten zinc. During the surface preparation stage, material going through degreasing/caustic cleaning, pickling, and fluxing.
- Galvanizing: Following surface preparation, the steel will be sinked in a bath of molten zinc. The zinc kettle contains at least 98% pure zinc and is maintained at a temperature between 815º-850º F (435º-455º C). While steel is sinked in the kettle, the zinc reacts with the iron in the steel to form a series of metallurgically bonded zinc-iron alloy layers with the final top layer 100% zinc.
- Inspection: The inspection process of galvanized steel is fairly simple. Zinc will not react with unclean steel, therefore a visual inspection of the product will provide a good assessments of the quality of the coating. Tests for coating thickness and adherence to ASTM standards will also be performed.
For more technical details please feel free to contact at RATTAN IRON WORKS (RIW) the flagship screws manufacturers in Delhi, India.
Nickel plating, also known as Nickel Electroplating, is growing popular process in Screws. Nickel is considered useful for electroplating metal because it provides superior ductility, corrosion resistance, and hardness. Nickel Electroplating can also improve a product’s brightness and external appearance. Nickel-plating chemicals deliver fully bright finish cosmetic effect.
To transfer nickel onto the surface of a screw properly, a negative charge must be applied to the base material. To achieve this, the product is typically attached to a rectifier, battery or other power supply via a conductive wire. Once attached, a rod made of nickel is connected in a similar fashion to the positive side of the rectifier or power source.
After this, the base material is sinked in a solution that consist a salt with a chemical makeup, including the electroplating metal. With Nickel Electroplating, this solution consists of water and nickel chloride salt. Due to the electric current present in the solution, the nickel chloride salt dissociates to negative chloride ions and positive nickel cat-ions. The negative charge of the base metal then attracts the positive nickel ions, while the positive charge of the nickel rod attracts the negative chloride anions. Through this chemical reaction, the nickel in the rod oxidizes and dissolves into the solution. Through this way, the oxidized nickel is attracted to the base material, and subsequently coats the Screws. For more technical details please feel free to contact at RATTAN IRON WORKS (RIW) the flagship screws manufacturers in Delhi, India.
BLACK OXIDE PLATING
Black oxide also known as Auto Black, delivers a deep black, stunning appearance to the Screws/Bolts. Although black oxide provides mild corrosion protection to Screws/Bolts, it is generally used because of its aesthetic properties. When black oxide is applied to the Screws/Bolts, a top layer of oil, which is generally dry to the touch, wax or lacquer, is applied to enhance the corrosion properties.
Black Oxide coating is done through, Hot baths of sodium hydroxide, nitrates and nitrites at 141 °C (286 °F) are used to convert the surface of the material into magnetite. Water must be added time to time to the bath, with proper controls to prevent a steam explosion. Auto Blackning involves sinking the part into various tanks. These tanks contain, in order, alkaline cleaner, water, caustic soda at 140.5 °C (284.9 °F) (the blackening compound), and finally the sealant, which is usually oil. The caustic soda bonds chemically to the surface of the material, creating a porous base layer on the part. Oil is then applied to the heated part, which seals it by “sinking” into the applied porous layer. It is the oil that prevents the corrosion. For more technical details please feel free to contact at RATTAN IRON WORKS (RIW) the flagship screws manufacturers in Delhi, India.
PTFE (Polytetrafluoroethylene) also known as XYLAN Plating. PTFE coated Screws/Bolts is an easy on/easy off properties which provide safe removal with wrenches. Lower the plant maintenance cost and increase safety by using PTFE coated Screws/Bolts. This coating offers a 2200 hour resistance to corrosion. PTFE coated fasteners are suggested by many engineers as a cost effective method of keeping corrosion under control, while not substituting for weaker alloys such as stainless steel. The durable, thin coatings and reliable performance of fluoropolymers make them ideal for chemical and abrasion resistance too.
PTFE coating is done through electrostatic coating process, the fluid is atomized, then negatively charged. The material to be coated is electrically neutral, making the material positive with respect to the negative coating droplets. The coating particles are attracted to the surface and held there by the charge differential until cured. With an electrostatic spray gun, the droplets pick up the charge from an electrically charged electrode at the tip of the gun. The charged particles are given their initial momentum from the fluid pressure/air pressure combination. Electrostatic spraying offers high transfer efficiency (65 % to 95 %) and excellent edge coverage. For more technical details please feel free to contact at RATTAN IRON WORKS (RIW) the flagship screws manufacturers in Delhi, India.
Mr. Vaibhav Jain