Products tagged with 'coating failures'

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Comparative Study of the Effect of Sulfate-Reducing Bacteria on Cathodic Protection under Simulated Blisters

Product Number: 51324-21195-SG

Author: Lisseth Ocando; Oladis Troconis de Rincón; Matilde F. de Romero; Antonio De Turris

Publication Date: 2024

$40.00

This work presents a comparison of the effect generated by a mixed culture of sulfate-reducing bacteria (SRB) isolated from a natural estuary in western Venezuela, on the cathodic protection (CP) of carbon steel under simulated blisters. The laboratory study was carried out simultaneously measuring attack morphology, polarized potential, pH, and sessile growth, inside a simulated blister in a special cell arrangement, using two types of coatings: one 100% solids epoxy, and the other one, a tape type, which consists of the combination of a geo mesh-polypropylene textile and tarred rubber. A potential of -3.2 V vs. Copper Sulfate Electrode (CSE) was applied, which allowed to reach polarized potentials more negative than -950 mV Vs. CSE without the presence of coatings. Various conditions were considered for the study: A) sterile medium, B) sterile medium inoculated with SRB only outside the blister, and C) sterile medium inoculated outside and inside the blister. The correlation of the results for each case allowed the establishment of different comparative tables that could help to improve corrosion management methods of buried or submerged pipelines in presence of SRB. In all cases, a decrease in CP efficiency under the blister was demonstrated.

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Evaluating the Flash Rust Protection of Water-Based Cleaners and Their Role in Surface Preparation

Product Number: 51324-20745-SG

Author: Lisa Marston; Luke Stone

Publication Date: 2024

$40.00

In metalworking processes, contaminants can interfere with future processing steps and may accelerate corrosion on metal parts. As such, a cleaning step is often implemented prior to coating or packaging finished parts. Industrial cleaners are typically water-based with blends of surfactants, co-solvents, chelating agents, and/or flash rust inhibitors. While accelerated corrosion tests such as humidity and salt fog exist, they are typically too aggressive for the evaluation of flash rust inhibitors in cleaners which are not meant to provide long-term corrosion protection. There is a need in the industry for a quick and reliable way to select a cleaner that meets the needs of the application and is compatible with the overall process. A screening method to compare the flash rust protection ability of various water-based cleaners was investigated. Modified vapor inhibiting ability (VIA) testing and linear polarization resistance (LPR) tests were performed on carbon steel plugs treated with several cleaners. Industry standards currently recommend that any detergent or cleaner be removed from metal surfaces prior to applying coatings. When evaluating cleaning processes where coatings will be subsequently applied, adhesion testing should be paired with the screening test. The effects of various cleaners on adhesion of a waterborne acrylic coating were investigated.

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Variables That Can Affect Pull Off Adhesion of Coatings

Product Number: 51323-19147-SG

Author: Swapnil Shukla, Nicole Rakers, Michael McCarthy, Bernard McPeak

Publication Date: 2023

$20.00

Adhesion is a physical property that is crucial in many coatings, sealants, and adhesive applications, be it automotive, marine, or aerospace for example. Pull-off adhesion testing is an important tool in evaluating a coating’s performance, particularly while comparing pre- and post-exposure results. No matter what the application, the method for testing adhesion along with selecting the appropriate testing criteria has been the subject of multiple studies and reviews in the historical literature.

Products tagged with 'coating failures'

Comparative Study of the Effect of Sulfate-Reducing Bacteria on Cathodic Protection under Simulated Blisters

Evaluating the Flash Rust Protection of Water-Based Cleaners and Their Role in Surface Preparation

Variables That Can Affect Pull Off Adhesion of Coatings

Association for Materials Protection and Performance