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Blistering is a common failure in marine coatings that can be caused by both physical, such as osmotic pressure and temperature gradients, and electrochemical forces like cathodic or anodic polarization. This paper/presentation will start by discussing the various mechanisms that lead to coating blistering, how blisters form, and how to prevent them.
Blistering is a common failure in marine coatings that can be caused by both physical, such as osmotic pressure and temperature gradients, and electrochemical forces like cathodic or anodic polarization. This paper/presentation will start by discussing the various mechanisms that lead to coating blistering, how blisters form, and how to prevent them. Next, the effects of blistering on coating performance and corrosion of the underlying substrate were investigated through creating blisters on coated test panels and inspecting them for coating failure and pitting corrosion after exposure. Additionally, several ship tanks were inspected for blistering before and after one to three-year service intervals. The inspection results showed a significant number of blisters broke in the time between inspections, typically forming cracks or pinholes through the coating. Performance of blisters from tank to tank varied, suggesting service type and time of wetness may play a role in the risk of blisters breaking. Blisters seen in varying services may form due to different mechanisms as well. Pitting corrosion measurements on the lab panels showed intact blisters do not provide adequate corrosion protection to the underlying steel in all cases, depending on the service and blistering mechanism. The data suggests an intact blistered coating is not equivalent to a boldly exposed, corroding substrate, but it is also not equivalent to a tightly adherent, intact coating.
Details of a new protocol for evaluating the effectiveness of coatings to reduce corrosion of steel structures is presented in this paper. Basic concepts of accelerated testing specified in American Society for Testing Materials (ASTM) standards and recent research investigations were used to develop a procedure that can provide conclusive results within 2400 hours of exposure as compared to more than 5000 hours in current practices.
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Surface conditioning is the first step in building efficient corrosion protection on a part or structure. Key concerns during this step include, how to create a stronger anchor-profile and how to efficiently remove previously coated, damaged, or corroded elements from a materials surface prior to coating. The ideal solution must consider three areas of the surface conditioning process: finish quality, cleaning efficiency and total cost.
Mineral abrasives such as glass bead and aluminum oxide have been traditionally used in the surface finishing industry. The general perception is that they offer acceptable cleaning at a low operating cost. Often dismissed is the potential of metallic alternatives that though seemingly higher in initial procurement cost, offer several differentiating advantages in terms of recyclability, consistency of finish, repeatable results and ultimately resulting in overall, reduced operating costs.