Advantages Of Different NDT Techniques

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What Do You Understand By Coating?


In the realm of welding and corrosion, coating can be defined as the sparse layers of any covering substance applied or deposited on the surface of an object, primarily for enhancing its properties. It also helps in forming a protective barrier to prevent the surface from deteriorating because of reaction with the external environment.

The surface onto which any coating is added, is known as a substrate. And the layers of protection keep it from undergoing electrochemical reactions with elements in the open atmosphere. As such, coating aids in ensuring good quality as well as increasing the lifespan of pipelines, structures and other important equipment. It even removes some critical and life threatening flaws, thereby saving millions in terms of financial resources pertinent to premature replacements and repairs.

According to experts offering the service of coating inspection in Melbourne, corrosion coating is usually:

  • A thin layer of some metal
  • Inorganic lining such as that of porcelain and glass
  • Organic coating like paint, varnish, polymeric materials, etc
  • Printed or etched covering or optical film layer

A typical coating might be applied for providing:

  • Resistance against scratches and abrasions
  • Protection from extremely high temperatures as well as fires
  • Wettability and capacity to seal
  • Insulation against the flow of static electric charge
  • Enhanced aesthetics and physical appearance
  • Resistance against corrosion
  • Non-stick or release property
  • Safety from cavitation, erosion, pitting and general wear & tear

Let’s take a look at some fine instances of coating in order to comprehend it better:

  • Components of jet engine covered with cermet
  • Fabrics provided with waterproof lining
  • Components having extrusion coating
  • Layers of anti corrosion and anti rust paint
  • Adhesive tapes
  • Varnish and polymeric material applied on pipelines & structures

There are a wide range of materials out there which act as substrates for coating. The most common ones include steel, various non-metals as well as other metals, paper, wood, plastics and fabric. In the modern times, coatings serve a primary purpose of offering protection to structures & pipes that are either buried deep into the ground or immersed under the surface of water, such as oil platforms & rigs.

In Melbourne, coating inspection is generally carried out by qualified coating inspectors in order to ensure the standard quality necessary for compliance with environmental, safety, operational and economic issues. The inspections are carried out with strong emphasis on industry standards, training and practices. Comprehensive downtime for re-coating and repairs are extensively minimised during these procedures.