Materials Performance Supplements

CORTEC 2017

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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tion capabilities where constant water fog is present. Treated 3- by 5-in SAE 1008 steel panels were tested for 500 h in the specified conditions before any corrosion was seen, as shown in Figure 1. In contrast, a control steel panel showed signs of corrosion within 24 h. astm d1748 P roduct A was t est ed acc ording to ASTM D1748 (with modifications noted above) to assess its corrosion protection in a constant condensing humidity envi- ronment. Treated steel panels were tested for over 1,950 h in the specified conditions before any corrosion was seen (Figure 2). In contrast, a control steel panel showed signs of corrosion within 24 h. Laboratory Testing: Immersion Testing Product A was tested in immersion conditions as noted above to assess the level of protection offered in a corrosive solution. As shown in Table 1, each panel that was treated with Product A witnessed a corrosion rate reduction of over 98%. Laboratory Testing: Coating Thickness and Dosing Estimation Immediately after application of Prod- uct A, a WFT gauge indicated a 175-µm (7-mil) film thickness on the surface of the test panel. After being allowed to drain for 1 h, the film was reevaluated to find a WFT of less than 25 µm (1 mil). Through several trials, the necessary amount of product required to ensure a uniform coating thickness upon applica- tion was determined to be 5.5 L of Product A per m 2 of cross sectional tank area. In the case of tanks with a non-constant cross sec- tional area (e.g., frustum-shaped tanks), the average cross sectional area should be used. Through similar trials the required amount of product to properly coat vessel walls was determined to be 1 L per 20 m 2 . The test apparatus is shown in Figures 3 and 4. Real World Analysis Select results from the elemental anal- ysis testing of water used to apply Product A are provided in Table 2. Conclusions Traditional chemical treatment and epoxy coatings can be both expensive and time-consuming methods for protection and preservation of large vessels. In large volume systems, a f loat coat can offer a more economical corrosion prot ection FIGURE 2. ASTM D1735 test results with Product A. The control panel is pictured on the far left. FIGURE 3. Image of the inside of the float coating test vessel. The vessel can accommodate several standard 4- by 12-in test panels (3- by 5-in test panels are pictured above). FIGURE 4. Total view of the float coating test vessel. Test panel holder, funnel and tubing for bottom-up filling of the vessel, and drain spout can be seen. PROTECTIVE COATINGS FIGURE 1. ASTM D1735 test results with Product A. The control panel is pictured on the far left. 12 JUNE 2017 MATERIALS PERFORMANCE CORTEC SUPPLEMENT TO MP

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