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The spread of disbondment or corrosion from a scribe or holiday in a coating film, for which the terms rust creepage or undercutting are used in this paper is an important mechanism of coating degradation. The mechanism of rust creepage has been well studied by several authors who concur that the mechanism is driven by electrochemical reactions15. The reactions occurring at the discontinuity in the coating (scribe or holiday) involve an anodic reaction in which iron is dissolved. Adjacent to the anodic region, under the coating, a cathodic reaction occurs in which oxygen is reduced to hydroxyl ions.
In new shipbuilding industries, conventional solvent-born coatings require longer curing period at low temperature season, which creates the needs for fast curing coatings to meet work schedule. In this study, several kinds of solvent free rapid cure epoxy coatings and polyurea coatings were evaluated in terms of feasibility for ship’s water ballast tanks (WBT).
Laser cleaning has been an effective tool in manufacturing and industrial applications for over 20 years. Cleaning, as well as cutting and welding, has shown vast improvements in repeatability and precision with the use of laser technology [4]. Previous bonding techniques such as mechanical fixturing and welding can be inconsistent and cause issues like increased structural weight, decreased structural integrity, galvanic corrosion, and many more potential failures [5]. Laser cleaning may propose a viable option for adhering materials to reduce weight and increase repeatability. Welding practices continue to develop to reduce both weld thickness and porosity. Porosity in welds is typically caused from failure to prepare the surface adequately [1]. Failures in both welding applications and adhesive bonding applications can be reduced with the use of laser technology.
BASF has developed a novel crosslinking isocyanate-free coating technology based on carbodiimide chemistry. A polycarbodiimide crosslinker with suitable functionality for coating applications and ultra-low free monomeric isocyanate has been introduced to the market. We formulated a 60% solids industrial primer using the new isocyanate-free coating technology and applied it on different metal substrates.
Until a few years ago, water tanks were always drained before exterior surfaces were painted because surface moisture, if found below the water line, would lead to a coating failure. But a coating technology borrowed from the bridge and highway industry and put to a new use is bringing changes to the water tank marketplace. This presentation introduces the original project, includes the coating evaluation after 6 years, and concludes with additional tank examples.
Composite repair systems’ performance relies heavily on the levels of adhesion between the initial layer of the composite system and the substrate. Enhanced adhesion translates to improved performance of the composite system since better bonding (whether mechanical or chemical) enhances the load transfer from the substrate to the composite layers as well as limit the porosity that would allow liquid or gas molecules to flow through. The aim of this study was to prove quantitatively how the APS atmospheric plasma surface preparation can improve the performance of composite repair systems whether on leaking or nonleaking defects.
Coatings are integral to a corrosion prevention strategy, especially with a multilayered system and cathodic protection. While these systems have redundancies and are designed with extended lifetimes, it is important to understand how each part of the system performs under stress. There are many coating chemistries out there for corrosion prevention, such as liquid epoxies and polyurethanes, but Fusion Bonded Epoxy systems have many favorable properties for scenarios that require the most cost-effective, resilient solution.