Menu
Search
Filters
Close
Menu

Save 20% on select titles with code HIDDEN24 - Shop The Sale Now

Effect of Cure Time on Corrosion Protection of Epoxy Polysiloxanes in Immersion Service

Picture for Effect of Cure Time on Corrosion Protection of Epoxy Polysiloxanes in Immersion Service
Available for download

Corrosion prevention on infrastructure subject to water immersion exposure has become more challenging due to the regulation of volatile organic compound (VOC) content in protective coatings. Legacy coating systems, such as vinyl solutions, afforded service lives of 30 to 50 years and were robust enough to endure cyclic exposure in impacted immersion service and stable against ultraviolet (UV) light exposure in atmospheric environments. Coal tar enamels are anoth er historic coating that has provided 50- to 100-year service lives as liners for small and large diameter pipes.

Product Number: 51323-19091-SG
Author: Carter Gulsvig, Allen Skaja, Bobbi Jo Merten
Publication Date: 2023
$0.00
$20.00
$20.00

For decades, the Bureau of Reclamation has used vinyl coatings for corrosion protection on gates. These structures are exposed to harsh environmental conditions with fluctuating water immersion and impact from debris. However, the vinyl systems are being phased out due to their high volatile organic compound (VOC) content. Prior laboratory research demonstrated that epoxy polysiloxane coatings may provide an alternative with initial results suggesting excellent corrosion protection in both atmospheric and water immersion environments despite manufacturers’ data sheets recommending the coating only as a topcoat for atmospheric environments, with no instructions for immersion service. This research tested the effect of cure time on electrochemical and physical properties for epoxy polysiloxanes applied to steel coupons. Specimens were sets and allowed them to cure for specified durations at 70 percent relative humidity and 21°C (70°F) before placed into laboratory immersion exposure and properties periodically measured using electrochemical impedance spectroscopy (EIS) and pull-off adhesion testing.


The results show that the polysiloxane provided adequate corrosion protection for all cure times. As the cure duration in 70 percent relative humidity increased, the initial barrier properties for the polysiloxane also increased. However, after 9 months of testing in immersion service, all test samples at different cure durations had the same barrier properties and adhesion testing results.

For decades, the Bureau of Reclamation has used vinyl coatings for corrosion protection on gates. These structures are exposed to harsh environmental conditions with fluctuating water immersion and impact from debris. However, the vinyl systems are being phased out due to their high volatile organic compound (VOC) content. Prior laboratory research demonstrated that epoxy polysiloxane coatings may provide an alternative with initial results suggesting excellent corrosion protection in both atmospheric and water immersion environments despite manufacturers’ data sheets recommending the coating only as a topcoat for atmospheric environments, with no instructions for immersion service. This research tested the effect of cure time on electrochemical and physical properties for epoxy polysiloxanes applied to steel coupons. Specimens were sets and allowed them to cure for specified durations at 70 percent relative humidity and 21°C (70°F) before placed into laboratory immersion exposure and properties periodically measured using electrochemical impedance spectroscopy (EIS) and pull-off adhesion testing.


The results show that the polysiloxane provided adequate corrosion protection for all cure times. As the cure duration in 70 percent relative humidity increased, the initial barrier properties for the polysiloxane also increased. However, after 9 months of testing in immersion service, all test samples at different cure durations had the same barrier properties and adhesion testing results.

Product tags
Also Purchased
Picture for Rust Creepage Mechanism for Offshore Atmospheric Coatings
Available for download

Rust Creepage Mechanism for Offshore Atmospheric Coatings

Product Number: 51323-18754-SG
Author: Benjamin T. A. Chang
Publication Date: 2023
$20.00

The service life of current offshore platform coatings are normally less than 10 years. It is very expensive ($100/ft2) to rehabilitate the offshore platform coatings in the field. Therefore, facility owners are very anxious to select the long-life coatings. The candidate coatings are normally tested in the lab following the ISO 12944-91 or the AMPP TM216122 standard.
Picture for Polymer Degradation In Industrial Services
Available for download

Polymer Degradation In Industrial Services

Product Number: 51323-18870-SG
Author: Ana Benz, Matthew Bell
Publication Date: 2023
$20.00


Once polymers are used reliably in a specific service, they become the material of choice due to their cost effectiveness. However, to choose and apply polymers dependably, one must consider their unique properties – they are different from the metals we use industrially. Through various examples of damaged and failed parts, this paper illustrates fundamental information about choosing, using, and keeping polymers in service. Polymers are subject to permeation, oxidation, aging, fatigue, installation damage, and other damage.
Picture for Investigation of Polymeric Elastomers for Cavitation and Erosion Resistance
Available for download

Investigation of Polymeric Elastomers for Cavitation and Erosion Resistance

Product Number: 51323-18950-SG
Author: Allen Skaja, Christine Henderson
Publication Date: 2023
$20.00

Cavitation occurs in localized areas where there is a pressure drop across a structure; the water goes through a phase transition and forms water vapor. These vapor bubbles implode, resulting in high velocity micro-jets which impact adjacent surfaces. These impacts release shockwaves of energy, which cause microscopic particles of the surface material to flake off.1 Repeated micro-jet impact causes microfractures in the affected surfaces and leads to pitting.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support