Canadian Finishing and Coatings Manufacturing

 

May 29, 2023

  

Hexigone’s latest test results prove that their sustainable corrosion inhibitors—Intelli-ion—can reach C5 levels of corrosion protection in both waterborne and solvent borne coatings. This presents the global coatings industry with the highest level of corrosion protection that is heavy metal and chromate-free.

CS panel 1C1-C5 are classifications used to describe the level of corrosion resistance required for aggressive environments and applications. C5 refers to highly corrosive environments, where the steel structure is exposed to high levels of humidity, saltwater spray, and other corrosive substances. Many coatings manufacturers formulate coatings to provide protection in these conditions—such as offshore oil and gas platforms, coastal areas, and chemical plants.

The coatings that have been tested were formulated at the PRA (Paint Research Association)—a UK-based organization that provides technical and scientific support to the global coatings industry. The REACH compliant inhibitors were added to both waterborne (WB) and solvent borne (SB) 2 pak epoxy coatings—with primer only as well as top-coated systems tested.

The panels used for testing were shot-blasted to Sa2.5 as per C5 specification. Each primer layer had an average dry film thickness (DFT) of 120 µm and the topcoat was applied at about 60 µm. After 1440 hours salt spray testing (SST) to ASTM B117 both the primer and full system for our WB Epoxy and SB Epoxy displayed zero signs of blistering in the coating system. To demonstrate the full performance of both systems with AX1 in, we removed half of the paint system to view the substrate underneath. The WB Epoxy system after 1440 hours shows minimum corrosion at the scribe—evidencing Intelli-ion’s excellent performance in WB systems. The SB Epoxy system also meets specifications with no blistering, minimum cross scribe corrosion, and no undercoat corrosion present on the full substrate.  CS Panel 2

Unlike zinc phosphate, which primarily provides anodic protection via precipitation, Intelli-ion offers both anodic and cathodic corrosion protection. The technology is released in a smart way and works by forming a protective nano layer on the metal surface, which provides a physical barrier to corrosion-inducing substances. Intelli-ion also has unique electrochemical properties that enable it to donate, or accept a proton, moderating under-film pH. The final mode of protection happens once it has donated a proton to OH- ions resulting from the cathodic oxygen reduction reaction, it forms a lone pair bonded layer over the metal surface at the cathode, blocking interfacial electron transfer.

The three modes of electrochemical protection are unique on the market and have received recognition through winning the British Coatings Federation’s ‘Sustainable Innovation – Supplier’ category in 2022. The company have also been awarded an EcoVadis Gold rating for their sustainable business practices. Hexigone invites coatings manufacturers worldwide to join forces and co-create high-performance, sustainable, smart coatings.

For more information, join one of Hexigone’s upcoming introductory webinars: https://www.hexigone.com/webinars

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