Grit blasting is the most commonly used method of preparing surfaces for metal spraying. It removes rust, mill scale and other surface contaminants and produces a suitably roughened surface by projecting a highly concentrated stream of relatively small abrasive particles at high velocity against the surface to be cleaned. It has also been shown to be effective in reducing the loss of fatigue strength.
Surface preparation is the essential first stage treatment of a steel substrate before the application of any coating, and is generally accepted as being the most important factor affecting the total success of a corrosion protection system.
The performance of a coating is significantly influenced by its ability to adhere properly to the substrate material. Residual millscale on steel surfaces is an unsatisfactory base to apply modern, high performance protective coatings and is therefore removed by abrasive blast cleaning. Other surface contaminants on the rolled steel surface, such as oil and grease are also undesirable and must be removed before the blast cleaning process.
The surface preparation process not only cleans the steel, but also introduces a suitable profile to receive the protective coating.
At Caldercote Steel grit is used for Carbon Steel, Mild Steel and Cast Iron. Aluminum Oxide is used for Stainless Steel, Duplex Steel, 316 Steel-Aluminium and Aluminium Bronze. We Grit Blast to all surface preparation grades.
SA 1 Light Blast
SA 2 Thorough Blast
SA 2.5 Very Thorough Blast
SA 3 Blast Cleaning to Pure Metal
Subsea structures are designed to withstand lifetime exposure of up to 25 years or longer to provide an uninterrupted service life. Our coating systems are therefore designed and tested according to internationally acclaimed standards such as NORSOK and we are accredited to NACE LEVEL 3