HOT DIP GALVANIZING

AFTER FABRICATION, IN CONJUNCTION WITH SOME OF OUR TRUSTED SUBCONTRACTORS, WHK HAS THE ABILITY TO PROVIDE MANY FINISHES. ONE OF THE
MOST COMMON FINISHES WE UTILIZE IS
HOT DIP GALVANIZING.

HOT DIP GALVANIZING IS THE PROCESS OF DIPPING FABRICATED STEEL INTO A VAT OF MOLTEN ZINC. IT IS A CORROSION PROTECTION METHOD USED MOST FREQUENTLY ON APPLICATIONS THAT WILL BE EXPOSED TO WEATHER OR WET ENVIRONMENTS. HOT DIP GALVANIZING APPEARS AS A DULL GREY FINISH.

BECAUSE HOT DIP GALVANIZING PROTECTS STEEL, THE WORK MUST BE FABRICATED FIRST (I.E. STAIRS, RAILINGS, CANOPY), THEN HOT DIP GALVANIZED. WELDS OR CUTS THAT OCCUR AFTER THE GALVANIZED FINISH HAS BEEN APPLIED MUST RECEIVE COLD GALVANIZING (ZRC) PAINT AT THOSE JOINTS FOR PROTECTION.

THIS IS THE MOST BASIC OVERVIEW AND THERE ARE MANY INTRICACIES TO THIS PROCESS! FOLLOW THE LINKS OR REACH OUT TO US WITH MORE QUESTIONS ABOUT HOW HOT DIP GALVANIZING WORKS AND WHAT TYPES OF APPLICATIONS MAY REQUIRE HDG. 

STEPS IN THE HOT DIP GALVANIZING PROCESS : 

  1. CLEAN THE STEEL, WITH A CAUSTIC SOLUTION TO REMOVE OIL, GREASE, DIRT, PAINT OR BASIC OXIDATION.
  2. RINSE OFF THE CAUSTIC SOLUTION.
  3. REMOVE MILL SCALE, VIA ACIDIC SOLUTION. 
  4. RINSE OFF ACIDIC SOLUTION.
  5. ZINC AMMONIUM CHLORIDE (CALLED FLUX) IS APPLIED TO STEEL TO STOP OXIDATION OF CLEANED SURFACE WHEN EXPOSED TO AIR. 
  6. STEEL DIPPED IN VAT OF MOLTEN ZINC AND HELD UNTIL TEMPERATURE OF STEEL REACHES THAT OF THE BATH. 
  7. STEEL IS COOLED IN A SEPARATE TANK TO INHIBIT UNDESIRABLE REACTIONS THAT MAY OCCUR IF NEW FINISH IS EXPOSED TO ATMOSPHERE WHILE COOLING.