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Nanotech Coating Pioneers Self-Repair Against Corrosion
Confirmed
In Short: A new study reveals how water droplets can charge up and degrade protective coatings, leading to corrosion.
Water droplets can gain electrical charge and degrade metal structures, even when covered with protective coatings, according to a new study. This phenomenon, previously unexplored, could explain why corrosion remains a significant issue despite the use of protective coatings. The research, published in Nature, shows that as water droplets slide along surfaces, they become charged, which can lead to corrosion even when a protective coating is in place.
The researchers found that once the coating is breached, the exposed metal sits in a salty drop with a fresh electrical potential across it. This charge can initiate corrosion processes, even in materials that are typically resistant to such damage. The team identified the corrosion products on copper using Raman spectroscopy and X-ray diffraction, confirming the presence of corrosion products.
The standard explanation for why rain causes corrosion is that water carries dissolved salts and acids to a surface, constant drumming of raindrops abrades whatever protective coating is on it, and oxygen does the rest. However, this new study suggests that the electrical charge carried by water droplets can directly contribute to the corrosion process, even before the coating is breached.
The findings have significant implications for industries that rely on protective coatings to prevent corrosion, such as the construction and automotive sectors. The researchers demonstrated that water droplets, when they slide about four centimeters, pick up a charge, roll off the edge, and then fall onto a copper plate coated with a 60-nanometer film of Teflon. This process can lead to corrosion, even in highly resistant coatings.
The study's implications extend beyond just coatings and corrosion. It highlights the need for new materials and technologies that can withstand the electrical charge carried by water droplets. This could lead to the development of self-repairing coatings that can neutralize the charge before it causes damage, potentially revolutionizing the field of anticorrosion technology.
What's confirmed
- Water droplets can gain electrical charge and degrade metal structures, even when covered with protective coatings, according to a new study. This phenomenon, previously unexplored, could explain why corrosion remains a significant issue despite the use of protective coatings. The research, published in Nature, shows that as water droplets slide along surfaces, they become charged, which can lead to corrosion even when a protective coating is in place.
- The researchers found that once the coating is breached, the exposed metal sits in a salty drop with a fresh electrical potential across it. This charge can initiate corrosion processes, even in materials that are typically resistant to such damage. The team identified the corrosion products on copper using Raman spectroscopy and X-ray diffraction, confirming the presence of corrosion products.
- The standard explanation for why rain causes corrosion is that water carries dissolved salts and acids to a surface, constant drumming of raindrops abrades whatever protective coating is on it, and oxygen does the rest. However, this new study suggests that the electrical charge carried by water droplets can directly contribute to the corrosion process, even before the coating is breached.
- The findings have significant implications for industries that rely on protective coatings to prevent corrosion, such as the construction and automotive sectors. The researchers demonstrated that water droplets, when they slide about four centimeters, pick up a charge, roll off the edge, and then fall onto a copper plate coated with a 60-nanometer film of Teflon. This process can lead to corrosion, even in highly resistant coatings.
- The study's implications extend beyond just coatings and corrosion. It highlights the need for new materials and technologies that can withstand the electrical charge carried by water droplets. This could lead to the development of self-repairing coatings that can neutralize the charge before it causes damage, potentially revolutionizing the field of anticorrosion technology.
What's still developing
- This work could pave the way for better anticorrosion coatings, says Stefan Weber, a physicist at the University of Stuttgart in Germany who was not involved in the study.
- Earlier work had shown that sliding along many surfaces causes water drops to become charged, but looking to sliding electrification as a source of corrosion represents a step forward, Weber says.
- Corrosion’s impact on the global economy is not trivial.
- This broad category of damage that includes rust cost the U.S.
- A spike in rabies cases among animals this summer has led to a rise in human exposures across the country, the Centers for Disease Control and Prevention warned Thursday.
- The CDC sent the advisory through its Health Alert Network, the primary communication channel the agency uses to disseminate urgent public health information to doctors, hospital networks and health officials.
- Atomic force microscopy of the impact zones found pits several nanometers deep in places deeper than the entire thickness of the Teflon film, meaning the damage ran clean through the coating and into the metal.
- A new study led by Zhongyuan Ni, Rüdiger Berger, and Hans-Jürgen Butt at the Max Planck Institute for Polymer Research in Mainz, Germany, has shown that water drops routinely arrive at a surface carrying an electrical charge large enough to punch through an insulating coating.