Welcome to the early August edition of our Corrosionpedia News Roundup. The News Roundup is an opportunity to inform our readers of some of the most exciting things going on in the world of corrosion today. Some portions of the News Roundup are intended to cover corrosion technology breakthroughs, some are about awards given for outstanding achievement in the corrosion industry, and still others are about problems that have occurred as a result of corrosion. For this edition, we talk about several new and exciting coating developments, including wax coatings, graphene coatings and even mango leaf coatings! We also talk about pipelines and airplanes. We hope you enjoy!

Stress Corrosion Cracking Puts Some Aircraft at Risk

The United States Federal Aviation Administration (FAA) recently released an announcement declaring that stress corrosion cracking (SCC) could cause failures on several smaller private aircraft. Special Airworthiness Information Bulletin CE-19-13, the document released by the FAA, presented information that shows stress corrosion cracking had been found on the fittings to which the flight control cables are attached.

The bulletin was released after numerous instances of stress corrosion cracking were found on several Beechcraft airplane models. Inspections should be performed on these airplanes to ensure that stress corrosion cracking is not a threat.

School Roof Collapses Due to Corrosion

A Grand Rapids, Michigan area school had its roof collapse earlier this summer. This past week, an engineering team found that the root cause was corrosion. Lee Middle & High School, which serves 6th through 12th grade students in Wyoming, Michigan, unknowingly had corrosion that deteriorated sections of its roof as a result of rainwater exposure. On an early June 2019 day, the roof finally failed as a result of the corrosion and fell into the building's interior. Fortunately, school was out of session for the summer and no students or faculty were injured. The school, nearly 100 years old, was evaluated for other structural concerns following the roof collapse, and has been deemed safe for the start of school in late summer.

New Research Provides Exciting Advancement for Graphene Coatings

Applied Graphene Materials has filed a patent request for new discoveries while on its way to developing a waterborne coating that uses graphene in its composition. The material being patented is intended for the development of a graphene coating that is water-based rather than solvent-based so that it can meet strict environmental regulations. Graphene is relatively new material that is included in the coating’s formulation because it provides resistance to corrosion while still maintaining electrical conductivity. The material costs and science behind graphene coatings still need to be optimized for widespread industry use.

Major Pipeline Coating in Question

Concerns are being raised about a protective coating intended to provide corrosion resistance for a 42-inch (1-meter) diameter pipeline in West Virginia.

The installation of the Mountain Valley Pipeline has experienced some delays, and certain segments of the coated pipeline were stored above ground for about a year. The delays are potentially troublesome because some people believe that coating degradation may occur as a result of being exposed to the elements for too long. The risk is that the coating could potentially break down and fall apart, which in turn could release toxic materials into the air prior to burying and into the ground once burying is completed.

3M, the coating manufacturing, asserts that there is no risk of this occurring under normal conditions, and that there is no data that shows the degradation of the coating is harmful to humans. Still, some anti-pipeline protesters and the Federal Energy Regulatory Commission (FERC) have concerns. An agreement among the involved parties is still being worked out.

New Wax Coating Could Prevent Battery Degradation

A new coating developed in China shows great promise at preventing the corrosion of lithium metal anodes on batteries. The wax composite coating was made by a team of researchers at Tianjin University and Tsinghua University. Lithium metal anodes, while highly desirable as a battery anode because of their high energy density, are generally unstable and corrode easily when subjected to air or water. The wax composite coating developed by the research team reduces corrosion and energy dissipation even when a coated lithium metal anode is exposed to high humidity and water.

Mango Plant Matter Can Prevent Corrosion on Ships

Mango leaves were used for a scientific study intended to develop a new type of coating. Mango leaf matter was combined with epoxy and other materials to create a coating that can be applied to marine vessels. During the development process, organic material was extracted from the mango leaves, which in turn led to the formation of iron-polyphenol. Iron-polyphenol is an organic metallic compound that resists corrosion.

The Indian team of scientists at the National Institute for Interdisciplinary Science and Technology were looking for a more environmentally friendly corrosion prevention solution for salty marine conditions. There is industry demand for a less toxic type of coating because the impact of coating materials on the environment is of increasing concern.