The Need For Carriage Bolts With Galvanized Coating

Galvanized carriage bolts are designed for through bolting wherein the bolt's square

neck is then utilized to keep the bolt from spinning as a nut is securely tightened on the opposite end. Using a carriage bolt will clean up the appearance of the outdoor projects like deck appliance, decks and docks. Also available in marine grade 5 Hot Dipped Galvanized carriage bolts designed for corrosion resistance.

Galvanized carriage bolts were originally used to attach the wheels to axles of carriages during the 18th and 17th centuries. The best way to install galvanized carriage bolts is to insert it onto the pre-drilled hole and then tap the bolt so that the head is flushed with the surface. Fasten with a lock washer, flat washer, and a nut. The lock washer then stops the bolt from loosening; you can also add an extra nut and tighten the 2 nuts together.

Many pieces of flat pack fixtures come with galvanized carriage bolts which people can then use to bolt the furniture together. These bolts may be accompanied together with a small wrench used for fastening the nuts, people may need to use this wrench of their own. It is also a good idea to make the habit of counting fasteners prior to assembling furniture, in order to confirm that everything needed actually is present.

Hot dip galvanizing is the method of applying a zinc coating in order to fabricate iron or steel material by the immersion of the material in a bath which consists primarily of molten zinc. The simplicity of the galvanizing method is a distinct advantage over the other methods of providing protection against corrosion. The automotive industry depends heavily with this process for the reproduction of many components used in a car manufacturing. Galvanizing forms a metallurgical bond in between the zinc and underlying steel or iron, therefore creating a barrier that is a part of the metal itself.

During galvanizing, the molten zinc then reacts with the iron in steel to form a series consisting of zinc/iron alloy layers. The photomicrograph of a galvanized metal coating cross-section shows a general coating microstructure consisting of 3 alloy layers with a layer of purely metallic zinc.

Galvanizing can be found in close to every major application and industry wherein iron or mild steel is commonly used. The utilities, chemical process, paper and pulp, automotive, and transportation industries, are just a few, have historically made extensive utilization of galvanizing for corrosion control. The electro chemical protection provided for steel by zinc coatings is vital element in the effectiveness mainly of galvanized coatings in protecting metal from corrosion. All pre-galvanized products rely on cathodic protection provided by the zinc to prevent the corrosion of exposed steel at cutt edges.

While the potential difference in metals is the prime force providing the corrosion current, it's not a reliable guide to a rate and type of corrosion naturally occurring at a particular point. The severity of galvanic corrosion is also dependent on the ratio of the different areas of metals in contact, the duration of wetness and the conductivity of the particular electrolyte. The presence of oxide films in the surface of one or even both of the metals can then greatly inhibit galvanic corrosion.

This is the process that a regular bolt or carriage bolt undergoes in order to be more protected from corrosion. Galvanized carriage bolts are best use for marine and water applications.

by: Gary Hall

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