Very often, when dissimilar metals come in contact, they are likely to corrode.
Metal is reactive and conductive. Corrosion is generally caused by reactivity whereas conductivity allows the less reactive metal in contact with it to transfer corrosion to its more reactive neighbor. This process is known as the galvanic corrosion.
What Is Galvanic Corrosion?
Galvanic corrosion, also known as bimetallic corrosion, is an electrochemical process where one metal corrodes preferentially when in contact with another, different metal, in the presence of an electrolyte. An example of this is a car body made of steel has aluminum components like brackets or mounts. Different types of metals are considered more or less noble and are arranged accordingly in the so-called galvanic series. Gold, for instance, is more noble and less reactive while a less-noble aluminum is more reactive. When different types of metal that are far apart on the galvanic series come in contact with each other, the inherent corrosion potential of the more noble of the two metals will transfer to the less noble metal.
The E-coat Solution to Corrosion
Electrocoating or E-coating provides products with a durable, long-lasting finish that is highly corrosion resistant. E-Coat is a technology that achieves high-quality, low-cost finishes at a level of efficiency and environmental compliance that no other finishing method approaches.
E-Coating is also environmentally friendly because the process produces little to no VOCs (Volatile Organic Compounds), HAPS (Hazardous Air pollutants) and is RoHS, OSHA, and EPA compliant. Environmental advantages include eliminating the need for costly air abatement equipment present with many solvent-based liquid sprays or dip processes. Electrocoating products are free of heavy metals and have low BOD/COD if introduced to waste streams. Products are water-based, thus reducing fire hazards and worker exposure to hazardous materials.
The Winona Advantage
Winona Powder Coating offers top quality electrocoat (E-Coat) services serving customers throughout the country. With our new TTX Indexing E-Coat line with 13-Stage Pretreat and Zinc Phosphate, we provide the convenience and flexibility to meet the demanding requirements of today’s manufacturing environment. Learn more about our services and E-Coating to decide if it’s the right choice for you.
