OPERATIONS AND MAINTENANCE
wetting phase is crucial for achieving adhesion. For liquid coatings to achieve good adhesion, they need both a clean surface and an optimal surface anchor profile. The anchor profile allows for the increase in total surface area and allows for mechanical bonding of the liquid coating within the peaks and valleys of the profile. With respect to industry standards, a near-white metal finish (SSPC-SP 10 or Sa 2 ½) is required to have a rust and debris- free substrate, while creating a profile sufficient for the liquid coating to penetrate and create a strong bond with the substrate.
MANAGING A CHALLENGING APPLICATION PROCESS With surface preparation being a key factor to the overall success of a coating, there would be a benefit to both contractors and end-users to specify and apply technology which is effective without the need for a long surface preparation and application checklist. PIB-based coatings do not age or degrade and stay in a viscous
Obvious corrosion on a boiler’s interior
state throughout their lifetime. A design feature of the coating system through the use of this coating technology is the inherent nature of the compound being non- curing, non-crystalline, and a fully amorphous low-viscosity material (ISO, 2016). The non-crosslinkable, liquid-like polymer with a low glass transition temperature offers key advantages, mainly in its ability to provide immediate and constant wetting of the surface, forming an instant barrier that blocks oxygen and water, thereby preventing corrosion. The non-crystalline nature, with a glass transition temperature below -60˚C (-76˚F), ensures that the corrosion protection adhesive compound maintains its fluid-like nature of wetting the surface at all times. This includes any movement with thermal expansion or contractions, pressure expansions and contractions, asset vibrations and movements.
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Condensing lines
A DEEP DIVE: THE STOPAQ SELF-HEALING
COATING Products like the Stopaq visco- elastic PIB-based coating, penetrate surface pores almost instantly and effectively, ensuring lasting adhesion. The PIB-based coating products offer compatibility to various substrates, often demonstrated with adhesion on steel, polyethene, polypropylene, and coal tar enamel, resulting in cohesive fractures which always leave a protective compound on the substrate, ensuring the coating’s robustness and longevity. In fact, the surface preparation requirements only require the removal of loose existing coating (if any), the removal of larger debris particles and oil or grease on the substrate. If applied to a metal substrate, the surface only needs to have a minimum hand tool cleaning SSPC-SP2 (St. 2) or power tool cleaning SSPC-SP3 (St. 3) finish. The reduction of stringent surface profile requirements also leads to the reduction of inspection points and steps required to achieve the necessary cleanliness and restrictions for the success of traditional coatings. The additional benefits of using simple tools for surface preparation include: reduction of workspace, access to hard-to-reach places, reduction in the need for complex and specific abrasive blasting equipment or media, reduction in energy requirements, reduction of waste, and no shutdown requirements or loss in productivity.
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