Organofunctional Bipodal Silanes for Enhancing the Corrosion Resistance of Heavy Metal-Free, VOC-Free, Waterborne Coatings
Jacob Shevrin, Applied Technology Scientist, Evonik
Although several established surface pretreatment processes for metals exist, such as chromate treatment and phosphatization, these otherwise effective methods are becoming increasingly overshadowed by global environmental concerns. This has led to the growing need for reliable corrosion protection systems without the harmful heavy metals and VOCs associated with the process. One solution to this widespread problem is waterborne silane technology, which has recently been shown to provide an environmentally friendly alternative to providing metal corrosion resistance. The mechanism behind this corrosion protection is the passivation of the metal surface by the waterborne silane film, which acts as a barrier to water and salts in the surrounding environment. In this work, we demonstrate that the incorporation of a bipodal silane into these waterborne systems not only provides more efficient surface passivation of the metal surface, but also enhances the hydrophobicity of the system, leading to significant improvements in corrosion resistance technology.