Cleaning, coating, and the nondestructive testing (NDT) of corrosion-susceptible surfaces requires extensive manual labor, often at heights that can create dangerous occupational environments. Drones, also known as uncrewed/unmanned aerial vehicles or systems (UAVs, UASs), can be leveraged to perform some of these tasks, including cleaning and coating, while keeping workers safely on the ground.
Since the 1980s, fluoropolymer resin technologies have offered the possibility of a quantum improvement in topcoat decorative properties- gloss and color retention- compared to conventional acrylic and polyester resins. Specifiers of both protective and architectural restoration coatings systems have expressed a need for a new SSPC standard for field-applied fluoropolymer topcoats, particularly for bright and saturated colors.
A continuing problem with coatings applied to sharp edges of a structure is the corrosion that
often develops at the apex of the edge. The conventional wisdom is that the reduction of film
thickness, due to coating pulling away at the edge during the curing of the coating, is the primary
cause for the onset of corrosion. This theory, however, is not necessarily correct, both from a
mechanistic and practical point of view.
Zinc rich coatings have long been used in the protective coatings industry as one of the primary means of steel substrate protection against corrosion. The primary protection mechanism has historically been galvanic sacrificial loss of zinc metal and the simultaneous formation of protective zinc oxides and salts. Various standards and customer specifications exist to ensure that the coating will provide the necessary corrosion protection for the life of the asset.
We studied the corrosion resistance for topcoat systems made using a solvent-borne 2K fluoroethylene vinyl ether (FEVE) polyol blended with different acrylic resins. The topcoats were applied over primed steel substrates. The primers consisted of zinc-rich (for 2-coat) and zinc-rich/epoxy mid-coat (for 3-coat) systems. Standard, salt fog (ASTM B 117), cyclic Prohesion (ASTM G85 Annex A5) and EIS (electrochemical impedance spectroscopy) test methods were used to determine corrosion resistance. The blended system performance was compared against FEVE, acrylic, polyurethane, and polysiloxanes controls.
Cementitious repair mortars are commonly used to rehabilitate deteriorated wastewater concrete infrastructure prior to the application of high-performance lining systems. These repair mortars occasionally receive a broom finish creating a “profiled” surface prior to the application of a trowel- or spray-applied protective lining system. Other recommendations require that that the cementitious mortars receive a blasted surface to impart a mechanical profile prior to topcoating with a similar lining system. In the following paper the author summarize the results of an investigation to quantitatively assess adhesion of a protective lining when applied to a broom finish surface verses a blasted surface.
The author will present on the various generic coatings technologies available for lining concrete and discuss the advantages and disadvantages of each one. Discussion will include epoxy, polyurethane and polyurea technologies. The goal of the presentation will be to provide some guidance to the attendees on when is the right application to select each technology as part of a specification.
With coating and lining of concrete, while it may seem like a simple, novel task, there are always challenges. Even though concrete may be one of the largest construction materials used today, it is a complex structural matrix that can be ever changing even in a single placement. The need for coating concrete to either waterproof, or extend the life of the structure is not new to our industry.
Inspection has always been a hot topic when it comes to coatings projects. There are some substrates that can be harder to specify due to not knowing without knowing which testing is relevant to specify and properly inspect the substrate and surface after it is coated. Concrete is probably the number one substrate that is confusing. This paper will dive into the testing that is relevant when specifying coatings for concrete tanks and structures. Whether it is how to properly check film build or whether or not an ASTM test is relevant, this paper will clear the waters and make specifying coatings for concrete tanks and structures easier.
Asbestos-containing textured surfacing materials, as well as other types of asbestos containing materials, were historically applied in significant quantities to concrete bridges and other structures built as late as the early 1990’s. During renovation (surface preparation for overcoating or total coating removal and replacement) or demolition of bridges, just like buildings, there are specific regulatory requirements such as licensure, inspections, procedures and notifications that must be followed to avoid compliance violations, litigation and to avoid unwanted asbestos exposure to employees and the environment.
The Paint Industry is a Sustainable Solution Provider to Several Industries.
Like Construction, Boating, Aero, Furniture, Sports, infrastructure projects,
and so on. Anything to which Paint touches, it increases, the life and beauty
by several times. This longer life of objects and structures save millions of
man-hours, extractions of resources, time, energy, and carbon footprint
during the process.
As global environmental regulations continue to tighten restrictions on VOC-containing coatings, the need for hydrolytically stable additives in waterborne coatings has never been greater. Alkoxysilanes are a class of widely used additives in the coatings industry, as they act as adhesion promoters between organic coatings and inorganic substrates. Given the high moisture sensitivity of alkoxysilanes, most silane additives rapidly undergo condensation in waterborne coatings, leading to gelling of waterborne coatings within the first few weeks or months on the shelf.