In Canada, industrial coating is a vital part of the solution for steel and concrete and other surfaces to find protection from corrosion, abrasion, chemicals, moisture and harsh operating environments. Industrial coating services integrate surface preparation, selection and application of the coating material so as to maximize the asset life and ensure functional performance. Proper substrate pre-treatment, preparation, and application quality are crucial to the success of the coating. The quality of the final coating will rely heavily on the quality of both preparation and application.
Changing Priorities across Canadian Coating Operations
Infrastructure and equipment are increasingly operating in harsh environments, with increased focus on long-lasting surface protection in Canada's industrial facilities. Steel structures that are exposed to moisture, road salts and industrial contaminants must be coated with systems that are known to stay adhered to the steel and resist corrosion for long periods of service.
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Exposure profile is now being used to a growing extent, not just a standard coating specification, to define the selection. Epoxy systems can offer good adhesion and chemical resistance, and polyurethane finishes can offer weather resistance and protection from ultraviolet exposure if there is significant exposure to the outdoors.
Surface preparation still plays a key role in the performance of coatings. Contaminants, corrosion products, mill scale and inadequate bonding of existing coatings can cause insufficient adhesion. Industrial coating contractors are thus paying more attention to abrasive blasting, mechanical preparation and surface cleanliness prior to coating. It is always useful to measure surface profile and to monitor environmental factors to achieve improved control of the coating process and minimize the chances of early deterioration.
Different sectors have specific requirements for coatings. For instance, processing facilities require coatings that can withstand chemical exposure and frequent cleaning. In contrast, transportation infrastructure needs coatings that resist abrasion, moisture, and de-icing materials. Friction or particle impact can cause wear to industrial equipment and require protection. A more suitable protection can be achieved by using a coating system designed based on the actual operating environment than by a generic coating specification.
Solving Coating Challenges through Better Application Practices
Applying a new coating system over an existing corroded substrate can present challenges in corrosion control. The solution starts by conducting a condition assessment that will establish the level of corrosion and pinpoint those areas that need a more thorough preparation or repair treatment.
Localized treatment can be undertaken to restore a damaged area before the application of the coating process, and helps to form a sound surface in order to provide protection. Good preparation enables coating specifications to be based on the actual status of the asset and not assumptions based on the appearance of the asset.
Curing, adhesion, and coating quality may be influenced by temperature and humidity during application. Canadian industrial projects require extensive environmental variation monitoring for quality control. Surface temperature measurements, humidity readings and dew-point calculations by the contractor can be utilized to decide if the ambient atmosphere is suitable for the application. Timed up or down to conditions or controlled application environments may help to increase curing consistency.
Getting access to large structures may cause practical issues, especially where elevation steelwork, tanks and complex equipment are located. The solution is a combination of access planning and application techniques where coating personnel can safely access the areas of interest without compromising coverage and can maintain a consistent coverage area.
Depending on the work area and structure, scaffolding, lifts and special equipment can be chosen. The planning of access also gives greater assurance of avoiding missed surfaces that may serve as starting points for corrosion.
Advancing Surface Protection and Stakeholder Value
Progress is being made in coating formulation, which is leading to the development of systems for specific performance goals, not as one-size-fits-all. High-solids coatings can deliver a significant coating thickness in relatively few coats, and certain epoxy and polyurethane coatings can be used to protect against chemical exposure, abrasion and weathering.
For conditions of high temperatures, where traditional systems would lose performance, thermal-resistant coatings can help equipment maintain its performance. Coating selection is now becoming more and more dependent on the matching of the coating properties for the actual service conditions.
Coating quality can also be improved by the improvement of inspection technology. Digital thickness gauges can help measure thickness quickly over large areas, and adhesion testing can be used to help determine the strength of the bond as needed. Holiday detection can detect any discontinuities in the protective coating system on tanks, pipelines and other assets where even minor discontinuities might expose the asset. Consistency of application of protective systems can be assured by better inspection, which provides asset owners with greater confidence.
Another area of opportunity for industrial coating management is condition-based maintenance. Operators of facilities can determine coating condition and prioritize areas based on corrosion development, coating breakdown and operating exposure rather than fixed recoating intervals. Inspection records may be used to indicate where further protection or design alterations may be warranted and may highlight areas of concern where they are not. This can aid in more efficient spending of maintenance and making sure that avoidable deterioration is avoided.
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