Following the publication of our questions and answers on the metallizing process, we have gathered all the content in one single document available in PDF format for your reference. Download the summary Feel free to submit your questions, we will be happy to answer them! Discover our new webseries! Watch our first videoclip and learn more about the fabrication of steel box girders for the new Champlain Bridge. Download the full interviews
Recent research have shown that unsealed metallized faying surfaces used in high strength bolted connections provide higher slip resistance than specified values for uncoated blast-cleaned Class B surfaces in North American design standards (Chiza and al. 2013; Ampleman and al. 2015; FHWA 2014). These studies followed the recommended procedure in the Research Council on Structural Connections Specification for Structural Joints Using High-Strength Bolts (RCSC 2014). Pawtucket River Bridge – Photo: Carl Vernlund/www.vernlund.com For…
In Canada, metallizing procedures must follow the CAN/CSA-G189 (2003) Sprayed metal coatings for atmospheric corrosion protection. Canam-Bridges also follows a worldwide specification for the application of thermal sprayed coatings – Specification for the application of thermal spray coatings NACE 12/AWS 2.23M/ SSPC – CS 23.00. Canam-Bridges uses 99.9 % pure zinc wire manufactured per ASTM B833, which covers zinc and zinc alloy wire used to deposit zinc coatings by metallizing for corrosion protection. Whittier Bridge Tomorrow: Do…
Since 1986, Canam-Bridges has metallized more than 2.5 million square feet of structural steel. That is like metallizing the entire surface area of almost 30 Empire State Building! Tomorrow: What is the application standard of metallizing? For more information, view our video on metallizing and visit the Painting and Metallizing section of our website. For any questions regarding this post, contact us.
To ensure a successful long term performance under severe conditions, preparation of SSPC-SP 5, or White Metal Finish with an appropriate angular profile is recommended. However NACE 12/AWS 2.23M/ SSPC – CS 23.00 specifies a minimum surface preparation of SSPC-SP-10, or near-white-metal finish obtained by blasting. A minimum of 2.5 mils of a sharp, angular profile depth is required. A high spray velocity is essential to penetrating the anchor profile valleys and developing superior splat adhesion. Particles…
Steel structures are subjected to aggressive environmental conditions. Metallizing ensures their longevity and structural integrity. In fact, with proper surface preparation and with a ten-year inspection cycle, a metallized coating can provide an indefinite service life well in excess of 30 years. Moreover, topcoat sealant can be used to fill the voids and prevent moisture infiltration, increasing the durability of the coating. Tomorrow: What surface preparation is required for metallizing? For more information, view our …
No size limitation which can ultimately reduce the number of field splices needed when compared to galvanized members. No dry or cure time, which significantly increases fabricator throughput. Zinc is a recyclable material and the metallizing process produces zero volatile organic compound emissions. Low temperature process in which the metallized surface never exceeds 250-300°F. Thus, there is virtually no risk of weld damage or distortion of the steel due to high temperature or overheating. Tomorrow: How durable is a…
Metallizing and hot-dip galvanizing are two zinc-based coatings that protect the steel substrate by physical barrier and cathodic protection. However, these two coatings are significantly different. Metallizing relies on a mechanical bond between the zinc and the surface of the steel substrate to form a protective coating. Because of this mechanical bond, the surface preparation is critical to performance. Hot-dip galvanizing is a total immersion process where the steel element is dipped into a…
Metallizing protects steel in two ways: Barrier Protection: The spray coating itself provides a strong barrier between the environment and the steel surface, keeping out water that eventually leads to oxidation. Cathodic Protection: Metallizing is also effective because it relies on an electrochemical reaction between steel and zinc to drive these zinc-based coatings to “sacrifice” themselves to protect the steel at the site of any damage. This sacrificial protection is akin to the protection provided by…
Do you sometimes wonder about the effects of metallizing on steel bridge girders? What are the advantages of this method? How does it protect the steel? What surface preparation is required? What about durability? In the coming days, Canam-Bridges experts will help you to demystify the metallizing process. If you do not find an answer to your questions, feel free to send us your questions and we will offer you our support. What is Metallizing? Metallizing…
