Grizzly Targets Hot-dip Galvanize all our target systems to prevent corrosion of the mechanisms and ensure that you get a rust-free target for years!
**AR500 Strike Faces are painted, NOT galvanized.**
What are the steps in the galvanizing process?Becca KeyesThere are four steps:
- Pre-inspection – where the fabricated structural steel is viewed to ensure it has, if necessary, the proper venting and draining holes, bracing, and overall design characteristics necessary to yield a quality galvanized coating
- Cleaning – steel is immersed in a caustic solution to remove organic material such as grease and dirt, followed by dipping in an acid bath (hydrochloric or sulfuric) to remove mill scale and rust, and finally lowered into a bath of flux that promotes zinc & steel reaction and retards further oxidation of the steel (steel will not react with zinc unless it is perfectly clean)
- Galvanizing – the clean steel is lowered into a kettle containing 850 f molten zinc where the steel and zinc metallurgically react to form three zinc-iron intermetallic layers and one pure zinc layer
- Final Inspection – the newly galvanized steel is sight-inspected (if it looks good, it is), followed up by measurement of coating thickness with a magnetic thickness gauge
How does the cost of hot-dip galvanizing compare to other corrosion protection systems, such as paints?Becca KeyesWhen compared with paint systems, hot-dip galvanizing after fabrication has comparable initial application costs and, almost always, lower life-cycle costs. In fact, the lower life-cycle costs of a hot-dip galvanized project make galvanizing the smart choice for today and tomorrow.
How long can I expect my galvanized steel project to last in service?Becca KeyesHot-dip galvanized steel resists corrosion in numerous environments extremely well. It is not uncommon for galvanized steel to last more than 70 years under certain conditions.
Does the galvanized steel coating of zinc resist abrasion?Becca KeyesThe three intermetallic layers that form during the galvanizing process are all harder than the substrate steel and have excellent abrasion resistance.
Can galvanized steel in service withstand high temperatures for long periods of time?Becca KeyesConstant exposure to temperatures below 390 f (200 c) is a perfectly acceptable environment for hot-dip galvanized steel. Good performance can also be obtained when hot-dip galvanized steel is exposed to temperatures above 390 f (200 c) on an intermittent basis.
Why would you want to paint over galvanized steel?Becca KeyesCalled duplex coatings, zinc and paint in combination (synergistic effect) produce a corrosion protection approximately 2x the sum of the corrosion protection that each alone would provide. Additionally, duplex coatings make for easy repainting, excellent safety marking systems, and good color-coding. Painting over galvanized steel that has been in service for many years also extends the life of the zinc coating.
How long will hot-dip galvanizing protect my steel from corrosion?Becca KeyesThe corrosion rate of zinc and how long it will provide protection is a function of the coating thickness and the amount of corrosive elements in the atmosphere. For example, in rural settings where there is less automotive/truck exhaust and plant emissions, galvanized steel can easily last for 100 â€“ 150 years without maintenance. Industrial and marine locations contain significantly more aggressive corrosion elements such as chlorides and sulfides and galvanized steel may last for 50 – 100 years in those cases. The relationship between coating thickness and atmospheric conditions is contained in a popular graph developed by the aga. Please see the publication hot-dip galvanizing for corrosion protection: a specifier's guide.
Where are galvanized steel products used?Becca KeyesFirst of all, the variety of things galvanized is broad. Structural steel (angles, channels, wide-flange beams, i-beams, h-beams), grating, expanded metal, corrugated sheets, wire, cables, plate, castings, tubing, pipe, bolts & nuts. The industries that utilized hot-dip galvanized steel range from:
- Bridge & highway (reinforcing steel for decks and column concrete, girders, stringers, light and signposts, guardrail, fencing),
- water & wastewater treatment plants (walkway grating/expanded metal, handrails)
- architectural (facades, exposed structural steel, lentils),
- parking garages (reinforcing steel for concrete decks, exposed structural steel columns and barriers),
- pulp & paper plants (structural steel, walkways, handrail),
- oems (motor housings, electrical cabinets, frames, heat exchanger coils),
- electrical utilities (transmission towers, distribution poles, substations, wind turbine poles),
- communication (cell towers),
- rail transportation (poles, switchgear, miscellaneous hardware),
- chemical/petro-chemical (pipeline hardware, manufacturing buildings, storage tanks, walkways),
- recreation (boat trailers, stadiums, arenas, racetracks), and many more.