--- title: Duncan Galvanizing Blog | Popi Papadonta --- [![logo](https://www.duncangalvanizing.com/hs-fs/file-2226764730-png/Duncan_Galvanizing/Images/logo.png)](https://www.duncangalvanizing.com/) 69 Norman St. Everett, MA 02149 Phone: [617-389-8440](tel:6173898440) Fax: 617-389-2831 - [Services](https://www.duncangalvanizing.com/services-duncan-galvanizing) - [Corrosion Protection](https://www.duncangalvanizing.com/services/corrosion-protection) - [Blasting](https://www.duncangalvanizing.com/blasting) - [Drawing & Detail Review](https://www.duncangalvanizing.com/drawing-review) - [Specifications Review](https://www.duncangalvanizing.com/spec-review) - [Technical Seminars](https://www.duncangalvanizing.com/technical-seminars) - [Fabrication & Touch-Up Seminars](https://www.duncangalvanizing.com/fabrication) - [Sustainability](https://www.duncangalvanizing.com/sustainability) - [Specifications](https://www.duncangalvanizing.com/specifications-2021) - [Processes](https://www.duncangalvanizing.com/processes-duncan-galvanizing) - [Hot-Dip Galvanizing](https://www.duncangalvanizing.com/hot-dip-galvanizing-process) - [Colorgalv®](https://www.duncangalvanizing.com/colorgalv) - [Liquid Coating (Paint)](https://www.duncangalvanizing.com/process/liquid-coating) - [Powder Coating](https://www.duncangalvanizing.com/powder-coating-0) - [Life-Cycle Cost Assessment (LCCA)](https://www.duncangalvanizing.com/life-cycle-cost-analysis) - [Showcase](https://www.duncangalvanizing.com/showcase) - [About](https://www.duncangalvanizing.com/about-us-duncan-galvanizing) - [Awards & Accreditations](https://www.duncangalvanizing.com/awards-accreditations) - [Mission & History](https://www.duncangalvanizing.com/about/mission-history) - [FAQs](https://www.duncangalvanizing.com/frequently-asked-questions) - [Team & Careers](https://www.duncangalvanizing.com/team-careers) - [Credit Applications](https://www.duncangalvanizing.com/credit-app) - [Privacy](https://www.duncangalvanizing.com/privacy) - [Blog](https://www.duncangalvanizing.com/blog) - [Contact Us](https://www.duncangalvanizing.com/contact-us) # Duncan Galvanizing Blog ## Popi Papadonta ### Recent Posts ## [What is the Production Process for Hot-Dip Galvanizing?](https://www.duncangalvanizing.com/blog/bid/112318/what-is-the-production-process-for-hot-dip-galvanizing) Posted by [Popi Papadonta](https://www.duncangalvanizing.com/blog/author/popi-papadonta) on Wed, Dec 21, 2011 @ 01:15 PM ## **Step 1: Surface preparation** Thorough cleaning is necessary as zinc will only adhere to clean steel. This gets accomplished by: - Degreasing: a hot alkaline cleaner is used to remove oil, grease, dirt, loose particles, and any other contaminates that may exist on the surface of the material - Acid pickling: an acid bath is used to remove mill scale and oxides - Fluxing (dry kettle): pre-fluxing in a zinc ammonium chloride solution to remove oxides and to prevent oxidation prior to dipping into molten zinc ## **Step 2: Immersion in bath of molten zinc** During this step, the steel is immersed in a bath of molten zinc at approximately 830˚F. The mix in the bath consists of ~98% pure zinc and 2% additives (Al, Bi, Ni). The zinc reacts with the iron in steel and it forms a coating which is metallurgically bonded to the steel. Also, the zinc flows into recesses and other areas difficult to access, coating all areas of complex shapes thoroughly for corrosion protection. [Hot dip galvanizing](https://www.duncangalvanizing.com/hot-dip-galvanizing-design) is the **only** coating system that protects tubular steel on the inside. The zinc goes “in, around, over, under and through” the fabrication.  ![hot dip galvanizing](https://www.duncangalvanizing.com/hs-fs/file-17457547-jpg/images/quonset-aga2k.jpg?width=157&height=125&name=quonset-aga2k.jpg)The size of zinc baths varies from galvanizer to galvanizer and this restricts the size of steel that can be galvanized. When choosing a galvanizer, make sure that the size of the zinc bath is big enough to accommodate the size of your products such as large structural shapes.  The final product is protected against corrosion as zinc creates a barrier between steel and the environment and also cathodically protects the base metal.  ## **Step 3: Finishing** After the steel is withdrawn from the galvanizing bath, excess zinc is removed by draining, by vibrating or for small items, by centrifuging. The galvanized item is then cooled in air. ## **Step 4: Inspection** Steel is inspected after galvanizing to verify conformance with [specs](https://www.duncangalvanizing.com/csi-masterformat).    ## Contact Duncan Galvanizing For high-quality hot dip galvanizing, color galvanizing, and more, contact Duncan Galvanizing at [(617) 389-8440](tel:6173898440) or fill out a [contact form](https://www.duncangalvanizing.com/contact).   *Sources: Duncan Galvanizing Corp., American Galvanizers Association* 4 Comments [Click here to read/write comments](https://www.duncangalvanizing.com/blog/bid/112318/what-is-the-production-process-for-hot-dip-galvanizing#comments-listing) Tags: [Corrosion Protection](https://www.duncangalvanizing.com/blog/topic/corrosion-protection), [Hot Dip Galvanizing](https://www.duncangalvanizing.com/blog/topic/hot-dip-galvanizing), [Duncan Galvanizing](https://www.duncangalvanizing.com/blog/topic/duncan-galvanizing) [All posts](https://www.duncangalvanizing.com/blog/all) ### Subscribe via E-mail ### Latest Posts ### Posts by category - [Colorgalv (4)](https://www.duncangalvanizing.com/blog/topic/colorgalv) - [Colorgalv Thermoset (3)](https://www.duncangalvanizing.com/blog/topic/colorgalv-thermoset) - [Corrosion Protection (6)](https://www.duncangalvanizing.com/blog/topic/corrosion-protection) - [Duncan Galvanizing (4)](https://www.duncangalvanizing.com/blog/topic/duncan-galvanizing) - [Engineering Topics (2)](https://www.duncangalvanizing.com/blog/topic/engineering-topics) - [Hot Dip Galvanizing (6)](https://www.duncangalvanizing.com/blog/topic/hot-dip-galvanizing) - [Home](https://www.duncangalvanizing.com/) - [Protective Coatings](https://www.duncangalvanizing.com/protective-coatings) - [Services](https://www.duncangalvanizing.com/spec-review) - [Specifications](https://www.duncangalvanizing.com/spec-050513) - [Resources](https://www.duncangalvanizing.com/hot-dip-galvanizing-design) - [About Us](https://www.duncangalvanizing.com/about) - [Contact Us](https://www.duncangalvanizing.com/contact) - [Blog](https://www.duncangalvanizing.com/blog-0/) Duncan Galvanizing, Corp. 69 Norman Street, Everett, MA 02149 Phone: 617-389-8440 © 2018 Duncan Galvanizing, Corp. 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