Materials Performance Supplements


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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the preservation of critical spare parts, or structures in a very severe environment is critical, these coatings can save customers from costly downtime of their equipment. This article shows, through research, that systems enhanced with VCIs can greatly improve the corrosion resistance of both sol- vent and waterborne coatings. In addition, waterborne coatings with VCI inhibitors can compete from a performance aspect with solvent-borne systems, while at the same time being more environmentally friendly, easier to clean up, and lower in VOCs. References 1. Y.I. Kuznetsov, et al., "Inhibiting Action and Absorption of Beta-Aminoketones on Met- als," Zasshchita Metallov 32, 5 (1996): pp. 528- 533. 2. C.W.Lea, FUCHS Lubricants, 2003 National Corrosion Service. 3. S. Prabhu, "Temporary Corrosion Protection during Storage, Transportation and Han- dling" (2016). 4. B. Bavarian, B.A. Miksic, "Inf luence of Crys- talline Structure and Particle Size of Vapor Corrosion Inhibitor Powders on Their Inhib- iting Effectiveness," CORROSION 2016 Re- search Symposium, Vancouver, BC, Canada. 5. B.A. Miksic, "Use of Vapor Phase Inhibitors for Corrosion Protection of Metal Products," CORROSION/83, paper no. 308 (Houston, TX: NACE International,1983) 6. ASTM B117-16, "Standard Practice for Oper- ating Salt Spray (Fog) Apparatus" (West Con- shohocken, PA: ASTM International, 2010). 7. ASTM D1748-10, "Standard Test Method for Rust Protection by Metal Preservatives in the Humidity Cabinet" (West Conshohocken, PA: ASTM, 2010). This article is based on CORROSION 2018 paper no. 10566, presented in Phoenix, Arizona, USA. MARKUS BIEBER is the director of sales— High Performance Coatings & Additives at Cortec Corp., St. Paul, Minnesota, USA, email: He has spent more than 20 years in product and sales management in the coatings industry, with a focus on providing customers with value- added coating solutions. He is a member of NACE International. PROTECTIVE COATINGS FIGURE 7 Construction grader. FIGURE 8 Industrial equipment. This testing shows that waterborne sys- tems can compete with solvent-borne sys- tems through the use of VCIs (Figure 5 and 6). However, there are some distinct advantages for using a waterborne system, which include: • More environmentally friendly • Lower volatile organic compounds (VOCs) • Easier cleanup Case History 1 Problem A manufacturer of large construction graders (Figure 7) needed an effective alter- native to prevent corrosion on its products. There were several disadvantages to the heavy wax-type product it was using. First, it did not always work if the equipment was stored outdoors for extended periods of time before shipping. Second, it left a greasy and slipper y film on the graders, which made it difficult to climb into them for moving and shipping. Finally, the product was hard to remove and had to be disposed of as hazardous waste. Application The manufacturer sprayed the VCI- containing coating and solvent in a 3:1 ratio on the equipment, which resulted in DFTs between 0.8 and 1 mil (20 to 25 µm). Then the machines were transported by rail to the sea- ports. A few of the graders were placed in con- tainers, but the majority were left uncovered. The VCI-containing coating at 1 mil outp er form ed th e traditional wa x-typ e coating at 3 mils (75 µm). The manufac- turer also found the VCI-containing coat- ing easier to spray, free of offensive odors, and much easi er to remove. Aft er tw o years of export shipments, it had experi- enced no corrosion problems when using the thinner film VCI-containing coating. Case History 2 Problem A manufacturer of industrial equipment (Figure 8) was struggling with protecting critically machined surfaces from corrosion and damage during transport. Due to the nature of the equipment, it was not able to deal with a spray application of a coating nor washing it down for removal. Application The manufacturer brush-applied the waterborne VCI-containing coating onto the equipment, which resulted in DFTs between 2 to 10 mils (50 to 250 µm). The equipment was transported to the final destination where the coating was removed by simply peeling it off. Conclusions There is a need in the marketplace for environmentally friendly, low VOC, remov- able coatings that can be applied at a thin film thickness (1 mil) that provide adequate corrosion protection and yet can still be eas- ily removed. Compared to permanent coat- ings where removal requires blasting or the use of heavy-duty solvents, or thick heavy barrier-type wax coatings that are difficult to remove and dispose of, many removable thin film coatings with VCI technology can be easily removed using an alkaline solution and high-pressure water. In offshore oil and gas applications where 18 JUNE 2018 MATERIALS PERFORMANCE CORTEC SUPPLEMENT TO MP

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