A galvanized bolt is a plain bolt coated with a layer of zinc. This zinc coating provides a protective layer against corrosion. This protection layer helps the bolt withstand moist and harsh environments, such as outdoor applications.
What is the importance of a galvanized bolt?
Corrosion Resistance: The zinc coating provides a protective barrier against weathering conditions that would otherwise cause corrosion in a bolt. A plain bolt would start to rust, break down, and eventually need to be replaced.
Longevity: Due to the bolt having a protective layer, it can last longer in outside environments compared to plain bolts that will rust away. The zinc layer also provides a tougher surface, which helps the bolt resist wear from friction and impacts during installation and use.
When would a galvanized bolt be used?
Galvanized bolts are typically used in applications where bolts are exposed to harsh environments that would break down plain finished bolts.
Sacrificial Anode
Zinc is more reactive than steel, so if the coating is scratched or damaged, the exposed steel will not corrode immediately. The zinc will corrode first, protecting the underlying steel.
Reduced Maintenance
With less susceptibility to rust and corrosion, galvanized bolts require less frequent inspection and replacement, leading to lower overall maintenance costs.
Cost-effectiveness
While galvanized bolts may have a higher initial cost, their durability and resistance to corrosion can lead to long-term cost savings due to reduced maintenance and replacement needs.
Versatility: Galvanized bolts are suitable for a wide range of applications where exposure to the elements is common.
History
Galvanizing began in the early 19th century. The process was first patented in France in 1837 by Stanislas Sorel, who developed a method for coating iron with zinc. However, the technique gained more widespread use and commercialization in the latter half of the 19th century, particularly after the hot-dip galvanizing process was refined.
Stanislas Sorel’s patent, granted in 1837, was for a process of coating iron with zinc to protect it from corrosion. He developed a method for applying zinc to iron using a molten zinc bath, which laid the groundwork for what would later be known as hot-dip galvanizing.
Sorel’s technique involved immersing iron or steel objects in molten zinc, allowing the zinc to form a metallurgical bond with the iron, creating a protective layer. This method has proven effective in preventing rust and corrosion, making it valuable for various applications, particularly in outdoor and industrial settings. Sorel’s work was significant in advancing the field of corrosion protection and set the stage for the widespread use of galvanized products in subsequent years.
By the late 1800s and early 1900s, galvanizing was increasingly adopted for various applications, particularly in construction and infrastructure, as its benefits for corrosion resistance gained more recognition. Since then, it has continued to evolve and is now a standard practice in many industries.