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AZZ Surface Technologies’ wet coating facilities offer durable corrosion protection to extend the life of components with an array of color wet blasted for precise and consistent coverage.
The expansive capacity of our highly automated wet coating operations enables us to finish parts up to 40 feet in length, including intricate parts and masking, with quick turnaround times and consistent on-time delivery.
AZZ Surface Technologies has the technical capabilities to provide custom masking to protect matting and contact surfaces to our client’s manufactured components, where critical tolerances must be maintained.
AZZ’s ISO 9001 certified processes and unwavering focus on zero defects enable us to meet the most stringent quality standards of the many industries we serve, earning us the following certifications:
AZZ Surface Technologies is committed to being more than a leading provider of high-quality metal finishing services. We are a collaborative supply chain partner that functions as if we are located within your production facility to significantly increase operational efficiencies, reduce your logistics costs, and make it easy to do business with us.
We want to work with you on your next project. Contact us at one of our North American locations.
By Mike Stroia, AZZ GalvaBar
Galvanized reinforcement, which has a longer history in reinforced concrete than any other technology on the market, witnessed very little change until the introduction of (ASTM A1094) Continuous hot-dip galvanized rebar. Accordingly, research is underway at Texas A&M University National Corrosion and Materials Laboratory to determine the recent innovation’s performance compared to traditional reinforcement solutions.
Researchers have completed phase 2 of testing corrosion performing materials used in reinforced concrete, including Hot-Dip galvanized (ASTM A767), Continuously Hot-Dip Galvanized (ASTM A1094), Epoxy Coated CGR (ASTM A1055), continuously galvanized MMFX (ASTM A1035/ ASTM A1094) and bare steel (ASTM A615).
The study examined durability aspects of these coatings and will observe longevity of concrete reinforced elements (Figure 1).
Figure 1.
The first two phases of the report explore how the baseline galvanized coatings (A767, A1094 and CG A1035) perform. Methodology for each phase is summarized below:
The NACE standard 0290 was used to establish a corrosion baseline rate for bare (615) steel and cathodically (767, 1035, 1094) protected steels (Figure 2). A 100 mV or more negative difference between bare steel and galvanized steels demonstrates the effectiveness in providing sacrificial protection to the reinforcing steel. The three samples identified are all providing comparable sacrificial corrosion protection well below (more negative=better) the cathodic protection limit.
Figure 2.
A very effective way of measuring corrosion performance of a coating is Electrochemical Impedance Spectroscopy (EIS). EIS measurements provide reliable data, allowing for the prediction of the long-term performance of the coatings (Figure 3). The result of EIS is the impedance of the electrochemical system as a function of frequency. Essentially, impedance testing provides an overall corrosion resistance of a coating system including electrolyte resistance, coating resistance, and charge transfer resistance of the metallic substrate.
Figure 3.
The 30-day testing reveals that the 767 specimens exhibited the lowest impedance values among the galvanized specimens. Results indicate that although this coating provides sacrificial cathodic protection, it is likely that the zinc corrosion products formed as a result of the anodic dissolution of zinc are less protective than the corrosion products formed on the 1094 specimens.
The higher corrosion or dissolution rate on the Zn layer will have less durability in terms of sacrificial protection effect. (i.e. 767 specimen will have a higher corrosion or dissolution rate, and the galvanized layer will have less life expectancy based on the current results). While comparable, it is evident that the consistent thick layer of pure zinc (1094) is providing more protection than a thicker zinc-iron alloy coating structure (767).
Early findings conclude galvanized rebar has the longest demonstrated life for coated products regardless of what specification is used for the design of concrete reinforced elements. The innovative processing and adaptability of GalvaBar lends itself to other longer life products, including: epoxy coated (ASTM A1055), used for Grade 65 and high strength thread-bar, smooth dowels and all grades of MMFX/ (ASTM A1035).
The test results are extremely positive and it’s clear that zinc protects steel no matter what product is selected for galvanized rebar. With GalvaBar, however, customers also receive the benefit of galvanized rebar that is processed prior to fabrication and the availability of a consistent, high quality product already available in the supply chain.
E-coating is an industrial paint process providing total paint coverage for the part, including areas that are typically inaccessible to other types of spray applications. The automated process ensures a precise, evenly deposited film and superior finish with comprehensive corrosion protection.
A division of AZZ, North America’s largest hot-dip galvanizer of fabricated metals, we have a significant operating footprint and state-of-the-art facilities, which make us well equipped for large-scale production and fast turnaround times. Extensive experience and strong quality control enable us to meet the stringent standards of the many industries we serve, earning us the following certifications and accreditations:
With highly automated operations and extensive expertise, we are equipped to meet your production demands, ensuring fast turnaround times and on-time deliveries.
We want to work with you on your next project. Contact us at one of our North American locations.
Our state-of-the-art, highly automated powder coating operations are equipped to accommodate parts measuring less than an inch to components up to 60 feet in length and meet high-volume production needs with turnaround times as short as 24 hours and consistent on-time delivery.
Utilization of the combination of conveyor and batch lines enables us to powder coat an array of components, including stampings, castings, extrusions, and tubing, all of which are processed through a three-stage or five-stage iron phosphate washer and are hand-washed as required to achieve a comprehensive, durable, and flawless finish.
AZZ’s ISO 9001 certified processes and unwavering focus on zero defects enable us to meet the most stringent quality standards of the many industries we serve, earning us the following certifications:
For high-quality powder coating that provides durable and decorative corrosion protection and meets your most demanding production requirements, AZZ Surface Technologies has you covered.
We’d like to work with you on your next project. Contact us at one of our North American locations.
AZZ Surface Technologies offers a wide range of high-quality metal finishing services to protect and extend the life of application-critical components. Our extensive capabilities, which include powder coating, plating, e-coating, wet coating, duplex coating, military specification coatings, and sand blasting surface preparation, offer comprehensive corrosion protection solutions for metal parts and components ranging in size, design, and function.
A division of AZZ, North America’s largest hot-dip galvanizer of fabricated metals, we have a significant operating footprint and state-of-the-art facilities which make us well equipped for large-scale production and fast turn-around times. Extensive experience and strong quality control enable us to meet the stringent standards of the many industries we serve, earning us the following certifications and accreditations:
Committed to being even more than a leading provider of high-quality metal finishing services, we are a collaborative supply chain partner which functions as if we are located within your production facility to significantly increase operational efficiencies, reduce your logistics costs, and make it easy to do business with us. AZZ is the supply chain partner who has you covered.
We’d like to work with you on your next project. Contact us at one of our North American locations.
