Industrial Surface Preparation

Industrial surface preparation is the process of bringing a component or structure into the condition required for its next manufacturing, coating, maintenance or finishing stage. Depending on the application, that may involve removing corrosion or old coatings, cleaning away contamination, creating a controlled surface profile or chemically treating the substrate.

There is no single surface preparation method for every component. The substrate, existing surface condition, required outcome, production volume and next process all influence how the surface should be prepared.

Surface preparation means deliberately changing or conditioning a surface so that it meets the requirements of the next process.

For steelwork, that might mean using abrasive blasting to remove rust, mill scale or coatings and create a specified profile. Other components may require cleaning, degreasing or chemical pre-treatment before painting or powder coating.

The important point is that surface preparation should not be considered in isolation. The condition required afterwards determines the preparation needed beforehand.

Surface preparation can support a wide range of manufacturing and maintenance requirements, including:

• removing rust and corrosion
• stripping paint and coatings
• removing mill scale and surface contamination
• preparing components before painting or powder coating
• creating a controlled surface profile
• cleaning components before inspection or further processing
• improving the consistency of subsequent finishing operations

If the primary requirement is removal of corrosion, coatings or scale using abrasive media, see our guide to abrasive blast cleaning.

Where the prepared surface will subsequently be painted or powder coated, the requirements change again. See surface preparation before coating

Abrasive blasting is one of the principal methods used for mechanical surface preparation.

The abrasive impacts the substrate, removing unwanted material and, where required, creating a surface profile. The result is influenced by factors including abrasive type, particle size and shape, blast pressure, nozzle selection and the original condition of the substrate.

Portable blast machines, cabinets, blast rooms and automated blasting systems can all perform surface preparation, but they serve different production environments and component types.

The correct equipment should therefore be selected around the application rather than simply choosing a familiar machine type.

Mechanical preparation is not always the complete answer.

Where components are being prepared for paint or powder coating, the process may also incorporate cleaning, degreasing and chemical pre-treatment systems.

SurfacePrep supplies spray and automated wash systems that can incorporate multiple treatment and rinse stages. Depending on the substrate and coating specification, processes can include phosphating and other conversion treatments designed to condition the surface before coating.

Chemical pre-treatment and abrasive blasting should not automatically be viewed as alternatives. In some finishing systems they perform different jobs within the same production process.

A visually clean surface is not necessarily a correctly prepared surface.

For many protective coating applications, both cleanliness and surface profile need to meet a defined requirement. SurfacePrep's Standards of Surface Finish guidance explains how blasted steel can be assessed for cleanliness and surface profile.

The required condition should be determined from the coating specification, substrate and intended service environment rather than simply blasting until the component appears clean.

The abrasive itself is part of that decision. Abrasive media selection influences cleaning rate, profile, contamination risk, dust and process economics.

Surface preparation often sits between fabrication or maintenance and the final finishing process.

For coating operations, that can mean:

clean → prepare → inspect → coat → dry or cure

SurfacePrep works across both sides of this sequence. The business supplies abrasive blasting equipment, abrasives and preparation systems as well as complete finishing systems for powder coating and wet paint.

Considering preparation and coating together can reduce the risk of specifying individual pieces of equipment that perform well independently but do not create an efficient overall process.