Materials Performance Supplements

CORTEC 2019

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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Laboratory testing, utilizing Modified ASTM D1748 conditions, showed that the use of a 50-µm VCI PE liner bag reduced the RH inside a package by 23% after 185 h, from 98% to 75%. Further, a time to temperature increase to 50 °C inside the pack was slowed by more than 100%, from 16 h in the control pack to 36 h in the pack with an additional liner bag. This system also showed increased corrosion protection, compared to the con- trol system, which only utilized VCI paper, stressing the importance of considering sec- ondary VCI protection in some applications. Two overseas shipments brought a vari- ety of results. The first showed a significant reduction in RH exposure within a pack- aging system that utilized a combination of VCI barrier paper inside each box, non- VCI PE pallet liner, and over bag. This was compared to a control system where parts were wrapped in VCI paper and non-VCI PE bags in each box and the entire pallet being wrapped with PE shrink film. Although temperatures were constant among the two packs, the control pack reached and sustained an RH of 60% or greater within four days of shipment, compared to 31 days for the second pack. While corrosion was not seen in either of the tested packaging systems, the revised method would be less time-consuming and more cost effective. VCI paper would continue to be used, while eliminating the need for adding a PE bag to every individual box, and not requiring heat shrinking for every pallet. The second overseas shipment explored differences in conditions experienced outside a large crawler unit, compared to conditions inside the fuel tank. Sensor readings showed that conditions on the vehicle exterior are much more severe, and also much more vol- atile, compared to inside the fuel tank. How- ever, conditions within the fuel tank were still severe enough to induce corrosion during a six-week shipment and storage period, as seen in the untreated biodiesel tank. Con- versely, a tank treated with VCI additive did not show any corrosion during this time (Fig- ure 7). This fuel tank corrosion was the big- gest concern of the end user, and combining the success of a VCI additive with the quanti- tative environmental data led to a change in preservation process prior to shipment. Acknowledgments The authors would like to thank John FIGURE 6 Sensor data from an overseas shipment, United States to China. The data above were the conditions within a packaging system utilizing a PE liner and bag, plus VCI barrier paper. FIGURE 7 VCI-treated fuel tank after shipment. No corrosion was visible. Spangler and Caterpillar personnel, both in the United States and China, for their assis- tance and cooperation in these analyses. Additionally, the authors would like to thank Luke Sieverding and John Deere personnel, both in the United States and Brazil, for their assistance and cooperation. References 1. ASTM D1748 (latest revision), "Standard Test Method for Rust Protection by Metal Preser- vatives in the Humidity Cabinet" (West Con- shohocken, PA: ASTM International). This article is based on CORROSION 2019 paper no. 13120, presented in Nashville, Tennessee, USA. ERIC UUTALA is a technical director at Cortec Global Services, Inc., St. Paul, Minnesota, USA. His work involves ensur- ing that all Cortec preservation products are used in the most safe, effective, and efficient manner. He collaborates with project operations and management teams to review and write product appli- cation specifications, while also review- ing and optimizing product usage at the various operational sites. He has been with the company for more than 12 years. BOB DESSAUER is a regional sales manager at Cortec Corp. He works with manufactur- ing companies to identify and find solutions to corrosion issues. He trains distributors of Cortec products and identifies customer needs for corrosion control. He has been with the company for more than six years. Use of Volatile Corrosion Inhibitors in Packaging to Protect Equipment from Corrosion 17 CORTEC SUPPLEMENT TO MP MATERIALS PERFORMANCE JUNE 2019

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