As an additional resource, there are organizations that have put together tools for predicting the estimated life span of galvanized steel given certain factors as well as the time frame for when a galvanized part should be maintained based on the thickness of the galvanizing, however these are strictly estimates and are not 100% accurate.Īccording to the American Galvanizers Association, hot-dip galvanized fasteners (assuming a minimum 2.5 mil coating thickness) in the following environments can expect the following minimum lifespan before time of first maintenance: According to the American Galvanizers Association, galvanized steel “corrodes at a rate of 1/30 of bare steel in the same environment.”Īs stated, there really isn’t any way of knowing for sure how long the galvanized coating will last, but for optimal protection, it is important that the company performing the galvanizing is following a set of guidelines, such as ASTM F2329 or ASTM A153 Class C for galvanizing threaded fasteners, and ASTM A123 for iron and steel products, such as anchor plates. Since one environment is never equal to another, there isn’t any real way to determine how long the galvanizing will last. What we do know is that a galvanized fastener will withstand corrosion much longer than a bolt without any coating. For example, an anchor bolt may be embedded in soil, concrete, or even submerged in water. The application of the bolt is also a major factor. A bolt is most susceptible to corrosion when it is exposed to the atmosphere. Depending on the climate, the hot-dip galvanized coating will react differently. Common climates requiring a galvanized coating include rain, snow, a marine environment, or even high heat, resulting in doses of prolonged sun exposure. ![]() ![]() There are different elements that can make a difference in how long the galvanizing of a bolt will hold up, however the bolt’s environment is the main factor. A zinc plating could chip off and rust, but the hot dip galvanized coating bonds and penetrates the surface of the steel and will not chip or flake off over time. One thing to keep in mind is that hot-dip galvanizing protects the fastener from corrosion and continues to do so with more success than most other coatings. There are many different variables to consider, given the countless applications that a galvanized bolt may be used for and environmental conditions it may be exposed to. Unfortunately there is not a straightforward answer to this question. ![]() A common question when deciding whether hot-dip galvanizing is an adequate corrosion resistant coating for a fastener is, “How long will the galvanizing last before the steel begins to corrode?” The last thing you want to do is install a bolt in a corrosive environment, only to have it begin to rust a year later.
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