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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Understanding environmental condi- tions experienced during shipping (both domestic and export) and/or stor- age is critical when determining the most effective corrosion control system for metal components. Temperature and humidity sensors were used to help understand the conditions within indus- trial packaging applications, during dif- ferent overseas shipping routes, and during subsequent warehouse storage. The effect of secondary packaging (i.e., polyethylene film) on temperature and humidity within a package was also evaluated. The scope of this article is to compile and analyze the data, and uti- lize it to help develop the best corrosion prevention strategies. Quantifying environmental conditions experienced during shipment and storage of various m etal compon ents provides critical data, with respect to choosing the most effective preservation system. Differ- ences in conditions can be seen as a ship- ment moves from port to open water, from a heated warehouse to an unheated truck, and also from the outside of the pack to the inside (i.e., box, crate, or within a piece of equipm ent). Analyses were made to evaluate these scenarios. Differences were evaluated inside the packaging systems, as well as from the outside to the inside of a system. These were used to gain insight into the efficacy of various corrosion-in- hibiting systems, as well as the efficacy of adding a volatile corrosion inhibitor (VCI) to a given system. Use of Volatile Corrosion Inhibitors in Packaging to Protect Equipment from Corrosion Eric U U tala and Bo B d E ssa UE r, Cortec Corp., St. Paul, Minnesota, USA Laboratory Testing Accelerated corrosion testing was per- formed for spare gear components used by a heavy equipment original equipment manufacturer (OEM), in preparation for a plant shutdown. The goal of this testing was to determine the efficacy of various packag- ing systems, while trying to also understand environmental conditions experienced within a given pack. The OEM wanted to be able to monitor conditions within its ware- house, and subsequently within each pack, in real time, over the course of the shutdown. Gear components were wrapped in systems meant to simulate those used for shipment and storage. Temperature and humidity sensors were added to each pack, to quantify the effect of packing with a 50-µm VCI polyethylene (PE) bag. All systems were then exposed to modified ASTM D1748 1 test- ing conditions for 185 h. Overseas Shipping Environmental conditions during an overseas shipment can shift dramatically, from leaving port to crossing the equator. The daily rise and fall of temperature and humidity may not be as dramatic, but the overall trip from one side of the world to the other provides continuous challenges for nearly every industry. In this application, temperature and humidity sensors were placed inside two packages to evaluate the effect of differing packaging systems to con- trol temperature and humidity swings within a cardboard container shipping components from the United States to China. A second overseas shipping application examined the efficacy of VCI in protecting the internals of a steel fuel tank. The equip- ment OEM had been experiencing corrosion issues during this shipment, due to the severe conditions experienced both during the ship- ment, and subsequent (indefinite) outdoor storage. Crawler units were sent from the United States to Brazil to compare treated and untreated fuel tanks. Temperature and humidity sensors were placed both inside the tank and to the frame of the crawler to mea- sure the conditions experienced during ship- ment. Upon receipt, the tanks were opened and inspected for corrosion, to determine the efficacy of the VCI additive, and the sensors were recovered to review environmental data. Experimental Procedure Laboratory Testing— Modified ASTM D1748 Test standard ASTM D1748 creates an accelerated corrosion atmosphere by com- bining high heat (48.9 +/–1.1 °C [120 +/–2 °F]) with constant condensing humidity and a steady rotation of test samples at ~0.33 rpm. Testing is performed for a predetermined period, or until such time that corrosion is observed on the metal surface. In this evaluation, ASTM D1748 condi- tions were achieved with respect to tempera- ture and humidity. However, due to the size and configuration of test parts and packag- ing, testing in true ASTM D1748 conditions was not feasible. The goal of this test was twofold. The first goal was to evaluate the packaging system used for storage of component parts at the warehouse of a heavy equipment OEM. The existing packaging system was as follows: • Sheet of plywood placed on a pallet • Sheet of VCI paper on top of the plywood • Layer of machined metal parts on the VCI paper VOLATILE CORROSION INHIBITORS 14 JUNE 2019 MATERIALS PERFORMANCE CORTEC SUPPLEMENT TO MP

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