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Protective coating systems provide the primary corrosion protection for assets in sea water. Protective coating systems are defined as a specific combination of surface preparation and coating material applied under specified conditions to a specific structure. Over the past many years, the paint industry has focused considerable resources toward the formulation, performance testing and fine tuning of coatings materials.
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Dimensional Profiling is a new prospective of applying sustainable non-slip characteristics to the surface of polymeric flooring and coating systems. Over the last three decades, it has been commonplace in the industry to provide a single nonslip media profile.
The hot-dip galvanizing on steel components is a very reactive material that is often given a surface treatment to inhibit oxidation from exposure to moisture and other constituents in the atmosphere. These treatments are referred to as “passivation treatments” and are applied to the zinc surfaces during the quenching process or soon after and before the surfaces begin to oxidize.
Many times, concrete coating projects are approached similarly to those of other paintable substrates, like steel or wood. The primary and sometimes only, focus is to provide a visibly clean and sound surface. More experienced design professionals will ensure that voids are filled, protrusions are ground to plane, and the correct surface profile is achieved. Once prepared, a serviceable coating system is applied (always as per the manufacturer’s recommendations) and no one looks back… unless there is a failure.
Neptune Bulk Terminals in Vancouver, British Columbia needed to re-coat two of its ocean-going Potash Ship Loader conveyors within a 27-day window to prevent interruption of international ship loading schedules. The contractor elected to use ultra high pressure water jetting (UHPWJ) for the steel surface preparation rather than the sand blast medium used on the previous loader conveyors. This required innovative desiccant dehumidification equipment to facilitate rapid drying of the steel upon completion of the UHPWJ work due to an increased moisture load.
The 2014 US bridge inventory lists over 610,000 highway bridges. Industry experts believe that the cost of maintaining those bridges for repairs due to corrosion is at least $30 billion annually. Bridge owners do not have the resources to maintain bridges in good condition. New bridges are being constructed, at the rate of approximately 3,000 nationally each year. Those new bridges must not pose additional maintenance burdens on the already inadequate bridge maintenance budgets.
According to the international surface preparation standard for welds (ISO8501-3), the preparation grades before the application of paints are divided into 3 levels, P1, P2 and P3. These grades are described with rough qualitative representations, not description of surface treatment methods or measurable conditions. Because of the ambiguous wordings on the standard, there have been a lot of arguments for the surface preparation grades and abraded condition during the construction.
The objective of surface preparation is to create proper adhesion of a coating over the substrate. Proper surface preparation is vital to the long life and effectiveness of a coating applied in corrosive service. In some projects, the owners ask for the additional water jet cleaning prior to blasting work.
Feathering is the process of tapering or blending-in an existing intact coating in preparation of applying a new repair coating. This industry common practice is intended to ensure good adhesion of the repair coating to the legacy coating, and to provide a seamless aesthetic transition for areas where maintenance painting is performed. There are no industry standard requirements for performing feathering, resulting in most specifications having their own unique definition.
Coating performance and longevity is highly dependent on the quality of substrate surface preparation. The effect of profile height, profile type (e.g., type of tool used to perform the prep, angularity of profile, etc.), extent of cleanliness, and amount of chloride contamination on coating performance were all studied to determine the correlation between these factors in an attempt to identify the primary factor in coating failure due to improper surface preparation.
Substrate preparation which includes the removal of contaminates, abrading or etching to create a surface profile via mechanical or chemical methods have a major impact on the adhesion performance of applied coatings. For coatings, a primary performance characteristic is adhesion after exposure to corrosive environments. One of the consequences of corrosion forming under a coating is the loss of adhesion or delamination of the coating.
This research paper describes the various predicaments and issues to enhance the effectiveness of environmentally responsible food grade paint, which helps in maximizing safety and reducing the risk of corrosion. The presentation of this report will consider the characteristics of food grade paint as well as enumerates the companies that produce food grade paint.