{"id":44,"date":"2020-03-23T09:28:12","date_gmt":"2020-03-23T09:28:12","guid":{"rendered":"http:\/\/www.airoshotblast.net\/blasting-machines\/?p=44"},"modified":"2026-10-07T08:29:39","modified_gmt":"2026-10-07T08:29:39","slug":"how-does-zinc-spray-oating-work","status":"publish","type":"post","link":"https:\/\/www.airoshotblast.net\/blasting-machines\/coating-gun\/how-does-zinc-spray-oating-work\/","title":{"rendered":"Zinc Spray Gun and How does Zinc Spray Coating work?"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>Zinc Spray Gun(Metallizing Gun): How It Works, Types, Uses, Abrasives<\/strong> <\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Rust slowly damages steel structures such as bridges, tanks, pipelines and machinery. A proven way to stop it is <strong>zinc metallizing<\/strong>, also called <strong>thermal spraying<\/strong>. This guide explains what a zinc spray gun is, how it works, where it is used, which abrasives to choose and how to stay safe.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is a Zinc Spray Gun?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A zinc spray gun, also called a <strong>zinc metallizing gun<\/strong> or <strong><a href=\"https:\/\/www.airoshotblast.net\/main-product\/98-Thermal-Spray-Gun\">thermal spray gun<\/a><\/strong>, melts zinc or a zinc alloy and sprays it onto a prepared surface. The molten particles hit the steel and bond in thin, overlapping layers. This is called a lamellar coating.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It protects iron and steel in two ways:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Barrier protection:<\/strong> The coating works as a wall between the steel and moisture and oxygen.<\/li>\n\n\n\n<li><strong>Galvanic (cathodic) protection:<\/strong> Zinc corrodes before steel does. Even if the coating is scratched, nearby zinc keeps protecting the exposed steel as long as it lasts.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key benefits:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Long life:<\/strong> A sealed coating can last about 30 years in rural areas and 5 to 25 years in urban and coastal areas. A quality zinc spray gun applied over a properly blasted surface gives the best results.<\/li>\n\n\n\n<li><strong>Adjustable thickness:<\/strong> Thicker coatings give longer protection, and extra can be added on weak spots like flange edges. A <a href=\"https:\/\/www.gritblast.co.in\/flame-spray-gun\/wire-flame-spray-gun-and-how-does-wire-flame-spray-gun-work\" target=\"_blank\" rel=\"noopener\">wire flame spray gun<\/a> lets the operator control the coating build-up easily.<\/li>\n\n\n\n<li><strong>No drying or curing time:<\/strong> Sealers and primers can be applied right away, which saves labour and time. This makes the metallizing gun a good choice for fast project turnaround.<\/li>\n\n\n\n<li><strong>No size limit:<\/strong> It works for small parts in a workshop and for large structures on site. A portable metalizing gun is ideal for on site jobs, and an electric arc spray gun suits large surfaces.<\/li>\n\n\n\n<li><strong>No warping:<\/strong> The steel stays near room temperature, so its shape and strength are not affected. A <a href=\"https:\/\/www.thermalspraygun.com\/\" target=\"_blank\" rel=\"noopener\">thermal spray gun<\/a> coats the steel without distorting it.<\/li>\n\n\n\n<li><strong>No VOCs:<\/strong> Zinc metallizing is inorganic, so it is better for the environment than many paints. A zinc wire spray machine gives a clean, solvent free coating.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">How Does a Zinc Spray Gun Work?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Surface preparation:<\/strong> The steel is cleaned with a <strong><a href=\"https:\/\/www.sandblastingmachine.in\/\" target=\"_blank\" rel=\"noopener\">sandblasting machine<\/a><\/strong> to remove rust, oil, mill scale and old coatings. This also roughens the surface so the zinc grips well.<\/li>\n\n\n\n<li><strong>Melting:<\/strong> Zinc wire is fed into the gun and melted by a gas flame or an electric arc.<\/li>\n\n\n\n<li><strong>Spraying:<\/strong> Compressed air blows the molten zinc as fine particles onto the steel.<\/li>\n\n\n\n<li><strong>Building layers:<\/strong> The particles flatten and bond on impact. Spraying continues until the required thickness is reached.<\/li>\n\n\n\n<li><strong>Sealing (optional but recommended):<\/strong> A sealer or topcoat goes over the zinc. Zinc accepts these very well, and the combined system needs little maintenance for many years.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Main Types of Zinc Spray Guns<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Flame Spray (Wire) Gun<\/strong><br>Melts <a href=\"https:\/\/www.airoshotblast.in\/wire\/zinc-wire\" target=\"_blank\" rel=\"noopener\">zinc wire<\/a> with a fuel gas and oxygen flame. It is portable and easy to use, which makes it a good fit for field and general jobs.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/www.sandblastingmachine.in\/electric-arc-spray-gun\" target=\"_blank\" rel=\"noopener\">Electric Arc Spray Gun<\/a><\/strong><br>Melts two zinc wires with an electric arc. It is fast and efficient, and it suits large surfaces and high volume work.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/www.airoshotblast.net\/main-product\/54-Powder-Flame-Spray-Gun\">Powder Flame Spray Gun<\/a><\/strong><br>Uses zinc or alloy powder instead of wire. It is useful for specialised work and for smaller or detailed parts.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Where Are Zinc Spray Guns Used?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bridges and steel structures<\/li>\n\n\n\n<li>Pipelines, tanks and storage vessels<\/li>\n\n\n\n<li>Transmission towers and electrical poles<\/li>\n\n\n\n<li>Marine and offshore equipment<\/li>\n\n\n\n<li>Industrial machinery and fabrication work<\/li>\n\n\n\n<li>Both workshops and on site projects, since the process has no size limit<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">What Abrasives Should Be Used Before Zinc Spraying?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The coating is only as good as the surface under it. Zinc needs a clean, rough surface, and the right abrasive creates it. Industry practice is to blast to a near-white or white metal finish (SSPC-SP5\/SP10 or Sa 3\/Sa 2\u00bd).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Recommended abrasives:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Aluminium oxide:<\/strong> Sharp and hard, and gives a consistent rough profile. It works well in a sandblasting machine or sand blasting pot with a blasting nozzle.<\/li>\n\n\n\n<li><strong>Steel grit (angular):<\/strong> Reusable and effective for a deep anchor pattern. It is commonly used with a <strong><a href=\"https:\/\/www.shotblast.in\/blog\/shot-blasting-machine\" target=\"_blank\" rel=\"noopener\">shot blasting machine<\/a><\/strong> or blast room with an abrasive recovery system.<\/li>\n\n\n\n<li><strong>Garnet:<\/strong> Cuts cleanly with low dust and works well for general blasting. Use it with a <strong><a href=\"https:\/\/www.gritblast.co.in\/portable-sand-blasting-machine\" target=\"_blank\" rel=\"noopener\">portable sand blasting machine<\/a><\/strong> for site jobs.<\/li>\n\n\n\n<li><strong>Silicon carbide or crushed angular grit:<\/strong> Suitable for hard surfaces needing aggressive cutting. Pair it with a durable <strong><a href=\"https:\/\/www.sandblastinghopper.in\/product\/boron-carbide-nozzles\" target=\"_blank\" rel=\"noopener\">boron carbide nozzle<\/a><\/strong> to handle the extra wear.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Avoid:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Round steel shot<\/strong> used alone, because it peens the surface rather than roughening it. This gives a poor bond when you apply the coating with a metal spray gun.<\/li>\n\n\n\n<li><strong>Silica sand<\/strong>, because it produces dust that causes serious lung disease (silicosis) and is banned or restricted in many places. Safe abrasives protect the operator and give the <a href=\"https:\/\/www.airoshotblast.net\/blog\/103-what-is-metal-spray-gun\">metal spray gun<\/a> a better surface to bond to.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Best practices:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Aim for a surface roughness of roughly 2.5 to 4 mils (about 65 to 100 microns), or as your project specification requires. Use a sandblasting machine to get a consistent surface profile, and check it with a surface profile gauge.<\/li>\n\n\n\n<li>Keep the abrasive clean, dry and free from oil and moisture. A <a href=\"https:\/\/www.gritblast.co.in\/sand-blasting-room\" target=\"_blank\" rel=\"noopener\">sand blasting room<\/a> with a Moisture Separator (air dryer) helps keep compressed air and abrasive dry. Store the abrasive in a covered, dry place.<\/li>\n\n\n\n<li>Spray the zinc soon after blasting, ideally within a few hours, before flash rust forms. Use an Airo Metalizing Gun or another <a href=\"https:\/\/www.gritblast.co.in\/thermal-spray-gun\/zinc-metallizing-equipment\" target=\"_blank\" rel=\"noopener\">zinc metallizing equipment<\/a> to apply the coating while the surface is still clean.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">6. Important Safety Considerations<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Zinc metallizing is safe when done correctly. Follow these precautions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Training:<\/strong> Only trained operators should use the equipment, following the manufacturer&#8217;s manual.<\/li>\n\n\n\n<li><strong>Respiratory protection:<\/strong> Zinc fumes and blasting dust are harmful. Use an approved respirator or air fed helmet.<\/li>\n\n\n\n<li><strong>Ventilation:<\/strong> Work in a well ventilated area, or use fume extraction indoors. Breathing zinc fumes can cause &#8220;metal fume fever.&#8221;<\/li>\n\n\n\n<li><strong>Eye and face protection:<\/strong> Wear goggles or a face shield. For arc spray, use a proper filter lens against the bright arc.<\/li>\n\n\n\n<li><strong>Protective clothing:<\/strong> Wear heat resistant gloves, long sleeves and safety boots (<a href=\"https:\/\/www.gritblast.co.in\/sand-blasting-machine\/safety-equipment-for-blasting\" target=\"_blank\" rel=\"noopener\">safety equipment for blasting<\/a>) .<\/li>\n\n\n\n<li><strong>Hearing protection:<\/strong> When using a <a href=\"https:\/\/www.sandblastingmachine.in\/zinc-spray-gun\" target=\"_blank\" rel=\"noopener\">zinc spray gun<\/a> such as the Airo <a href=\"https:\/\/www.airoshotblast.net\/blog\/104-what-is-metalizing-gun\">Metalizing Gun<\/a>, both the gun and the compressed air produce a lot of noise. Operators should always wear ear plugs or ear muffs..<\/li>\n\n\n\n<li><strong>Fire safety:<\/strong> Keep flammable materials away. Store and handle gas cylinders securely, and keep a fire extinguisher nearby.<\/li>\n\n\n\n<li><strong>Electrical safety (arc guns):<\/strong> Check cables and earthing, and keep the equipment dry.<\/li>\n\n\n\n<li><strong>Compressed air safety:<\/strong> Inspect hoses and fittings, and never point the gun at people.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Zinc Spray Gun(Metallizing Gun): How It Works, Types, Uses, Abrasives Rust slowly damages steel structures such as bridges, tanks, pipelines and machinery. A proven way to stop it is zinc metallizing, also called thermal spraying. This guide explains what a zinc spray&#8230;<\/p>\n","protected":false},"author":1,"featured_media":45,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[9,8],"class_list":["post-44","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-coating-gun","tag-zinc-spray-coatings","tag-zinc-spray-gun"],"_links":{"self":[{"href":"https:\/\/www.airoshotblast.net\/blasting-machines\/wp-json\/wp\/v2\/posts\/44","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.airoshotblast.net\/blasting-machines\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.airoshotblast.net\/blasting-machines\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.airoshotblast.net\/blasting-machines\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.airoshotblast.net\/blasting-machines\/wp-json\/wp\/v2\/comments?post=44"}],"version-history":[{"count":7,"href":"https:\/\/www.airoshotblast.net\/blasting-machines\/wp-json\/wp\/v2\/posts\/44\/revisions"}],"predecessor-version":[{"id":1009,"href":"https:\/\/www.airoshotblast.net\/blasting-machines\/wp-json\/wp\/v2\/posts\/44\/revisions\/1009"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.airoshotblast.net\/blasting-machines\/wp-json\/wp\/v2\/media\/45"}],"wp:attachment":[{"href":"https:\/\/www.airoshotblast.net\/blasting-machines\/wp-json\/wp\/v2\/media?parent=44"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.airoshotblast.net\/blasting-machines\/wp-json\/wp\/v2\/categories?post=44"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.airoshotblast.net\/blasting-machines\/wp-json\/wp\/v2\/tags?post=44"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}