Applied Technology Scientist
Jacob Shevrin joined Evonik’s Functional Silanes business line as an Applied Technology Scientist in May of 2017. Since then, his research has focused on silanes for coatings and metal treatment applications. Prior to joining Evonik, Jacob obtained an undergraduate degree in Physics from The Pennsylvania State University, and a Master’s degree in Materials Science & Engineering from the University of Pennsylvania.
Improving Corrosion Resistance, Alkaline Resistance and Weatherability of Waterborne Coatings with Organofunctional Bipodal Silanes
As global environmental regulations continue to overshadow the use of well-established metal surface pretreatment processes such as chromate treatment and phosphatization, the need for environmentally friendly corrosion protection systems has never been greater. A promising solution to this worldwide issue is waterborne silane technology, which offers a heavy metal-free, VOC-free, environmentally friendly alternative to metal corrosion protection. The mechanism behind this phenomena is best explained by the passivation of a metal surface with a waterborne silane layer, which acts as a barrier to water, salts and other corrosive materials in the surrounding environment. Most waterborne silane technology requires elevated temperature curing procedures for sufficient protection, which is difficult to achieve in certain applications or industries. Organofunctional bipodal silane additives can introduce additional crosslinking into these waterborne silane systems, thus providing additional protection without the required high-temperature curing procedure. In this novel work, we demonstrate that the use of organofunctional bipodal silanes in waterborne silane coatings improves the surface passivation of the metal surface, enhances the hydrophobicity of the system, and increases the crosslinking density of the system. This leads to significant improvements in the corrosion resistance, alkaline resistance and weatherability of waterborne silane pretreatments on aluminum and cold-roll steel surfaces.