--- title: Prevent White Rust ON Cooling Towers description: Galvanized steel has been used for evaporative cooling equipment for over 50 years. If properly treated and maintained, it can provide a long service life! However, white rust commonly occurs and can cause substantial damage to the galvanized coating and is detrimental to its appearance. 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[evaporative cooling equipment](https://info.hoffman-hoffman.com/blog/tag/evaporative-cooling-equipment) - [project profile](https://info.hoffman-hoffman.com/blog/tag/project-profile) - [refrigerant](https://info.hoffman-hoffman.com/blog/tag/refrigerant) - [rooftop systems](https://info.hoffman-hoffman.com/blog/tag/rooftop-systems) - [uvdi systems](https://info.hoffman-hoffman.com/blog/tag/uvdi-systems) - [venmar](https://info.hoffman-hoffman.com/blog/tag/venmar) - [ventilators](https://info.hoffman-hoffman.com/blog/tag/ventilators) # Prevent White Rust ON Cooling Towers ![](https://info.hoffman-hoffman.com/hubfs/calender-icon-black.png) June 19, 2020 ![](https://info.hoffman-hoffman.com/hubfs/passivation-results.png) Galvanized steel has been the preferred material of construction for evaporative cooling equipment for over 50 years. However a form of premature zinc corrosion, known as white rust, can occur on new galvanized surfaces. White rust can significantly damage the galvanized coating and mar the appearance of the surface.  Galvanized surfaces need to develop a protective oxide layer through the process called passivation, to help minimize white rust. Unfortunately, equipment operators do not have time to passivate before operating their equipment, as the process can take anywhere from two months to two years. After six years of research, Evapco has designed a 2-step process that reduces the potential for white rust formation. Evapco has introduced Pass-Protect passivation solution featuring Passiv-Assit for galvanized coils. **Here is the two stop process outlined by Evapco:** **Step 1: Passiv-Assist Factory Applied Pretreatment** After a new coil is hot-dipped galvanized, EVAPCO applies a proprietary chemical pre-treatment which substantially reduces the potential for subsequent white rust formation. Coils that receive the factory pre-treatment consistently develop less white rust than untreated galvanized coils across a broad range of makeup water qualities and ongoing water treatment programs. The factory pre-treatment does ***not*** provide a completely passivated coil. It does, however, make field passivation faster and yield better results. The coils are then assembled into the custom condenser or fluid cooler and shipped to the customer. **Step 2: Field Passivation** EVAPCO coordinates the field passivation service through their network of Factory Authorized Water Treatment Partners and the installing contractor. The site-specific field passivation service includes EVAPCO inhibitor chemistry, feed and control equipment and routine service visits by a local Water Treatment Partner. This usually lasts between 4-8 weeks whereas other properly executed field passivations can take up to 8-12 weeks or require white rust inhibitor to be fed throughout the life of the evaporative cooling equipment. For additional information and knowledge on passivation and white rust, watch the video below! content and video from Evapco ##### // about the author ![Marketing Department](https://info.hoffman-hoffman.com/hubfs/HH_Symbol_PMS300c_RGB.png) ### ![](https://info.hoffman-hoffman.com/hubfs/user.png) [Marketing Department](https://info.hoffman-hoffman.com/blog/author/marketing-department) The Hoffman & Hoffman marketing team is always looking for ways to educate our customers on HVAC use & efficiency. ##### // share this post - - - - [mailto:?body=https://info.hoffman-hoffman.com/blog/prevent-white-rust-on-cooling-towers](mailto:?body=https://info.hoffman-hoffman.com/blog/prevent-white-rust-on-cooling-towers) - ### Recent Posts ### categories - [ABB (6)](https://info.hoffman-hoffman.com/blog/tag/abb) - [AHU (1)](https://info.hoffman-hoffman.com/blog/tag/ahu) - [air circulation (9)](https://info.hoffman-hoffman.com/blog/tag/air-circulation) - [air handler (5)](https://info.hoffman-hoffman.com/blog/tag/air-handler) - [air pollution (4)](https://info.hoffman-hoffman.com/blog/tag/air-pollution) - [Air Purification (5)](https://info.hoffman-hoffman.com/blog/tag/air-purification) - [air quality (8)](https://info.hoffman-hoffman.com/blog/tag/air-quality) - [airborne illnesses (3)](https://info.hoffman-hoffman.com/blog/tag/airborne-illnesses) - [Architectural Design (1)](https://info.hoffman-hoffman.com/blog/tag/architectural-design) - [Architectural Solutions (1)](https://info.hoffman-hoffman.com/blog/tag/architectural-solutions) - [ASHRAE (8)](https://info.hoffman-hoffman.com/blog/tag/ashrae) - [Automatic Balancing Dampers (1)](https://info.hoffman-hoffman.com/blog/tag/automatic-balancing-dampers) - [Baldor Motors (1)](https://info.hoffman-hoffman.com/blog/tag/baldor-motors) - [Big Ass Fans (5)](https://info.hoffman-hoffman.com/blog/tag/big-ass-fans) - [Building (6)](https://info.hoffman-hoffman.com/blog/tag/building) ### subscribe #### Our Location Main Office 3816 Patterson St Greensboro, NC 27407 #### Hours of Operation 8AM to 5PM – Monday through Friday Closed Saturday and Sunday *We offer 24/7 emergency repair service* #### Contact Us ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Main Office [(336) 292-8777](tel:+3362928777) ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Stock Warehouse [(800) 334-0254](tel:+8003340254) ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Replacement Parts [(800) 332-2295](tel:+8003322295) ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/email-white.svg) Consultation / Evaluation: [info@hoffman-hoffman.com](mailto:info@hoffman-hoffman.com) Hoffman & Hoffman, Inc., Hoffman Building Technologies, Inc., Hoffman Mechanical Solutions, Inc., and Heat Transfer Sales, LLC, are separate legal entities. ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/footer-logo.png) All content © 2019, Hoffman & Hoffman [![Facebook](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/facebook-white.svg)](https://www.facebook.com/HoffmanHoffmanInc) [![Instagram](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/instagram-white.svg)](https://www.instagram.com/hoffmanhoffmaninc/) [![Twitter](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/twitter-white.svg)](https://twitter.com/HoffandHoffInc) [![LinkedIn](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/linkedin-white.svg)](https://www.linkedin.com/company/hoffman-%26-hoffman-inc./) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Marketing Department", "url" : "https://info.hoffman-hoffman.com/blog/author/marketing-department" }, "dateModified" : "2022-04-08T20:30:33.871Z", "datePublished" : "2020-06-19T13:50:59.000Z", "headline" : "Prevent White Rust ON Cooling Towers", "image" : [ "https://info.hoffman-hoffman.com/hubfs/passivation-results.png" ], "mainEntityOfPage" : { "@id" : "https://info.hoffman-hoffman.com/blog/prevent-white-rust-on-cooling-towers", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://info.hoffman-hoffman.com/hubfs/HH_Logo_RGB.png" }, "name" : "Hoffman & Hoffman, Inc." } } ```