Webinaaritallenne
Webinar: Modern analytical tools for coating degradation characterization Speaker: Ville Saarimaa 21st of March, 2024 The video discusses modern analytical tools such as broad ion beam milling and high-resolution SEM-EDS for characterizing coating degradation. It showcases examples of blistering, corrosion, and algae growth on coatings, highlighting the advantages of these techniques in understanding the underlying mechanisms. Key Moments: 00:21 - Webinar Introduction Top Analytica’s first webinar on coating degradation, chosen via LinkedIn poll, emphasizing audience engagement. Introduction to the CEO's background in coatings and analytical tools, focusing on broad ion beam milling and high-resolution SEM-EDS techniques. Detailed explanation of broad ion beam milling, sample preparation, and the use of titanium mask plates for effective cross-sectioning. 06:35 - Broad Ion Beam Milling Technique Argon ions bombard samples to reveal fine structures without mechanical damage, efficiently cutting through complex materials. Detailed process using mask plates and argon ion beams. Introduction to high-resolution EDS, where electrons bombard sample surfaces to create signals for material characterization. 12:40 - Polymer Windows in Detectors Polymer windows control measurement outcomes by adjusting x-ray energy levels, improving spatial resolution and signal quality. Thick polymer windows filter unwanted signals, enhancing detector performance. Thin polymer windows focus on low-energy x-rays, providing detailed mapping of small particles, surpassing traditional EDS systems. 18:56 - Humidity and Coating Degradation Humidity triggers coating degradation, causing visible blistering, especially in humid conditions. Importance of standardized tests like the condensation test for evaluating coating durability. Role of corrosion inhibitors in outdoor coatings to prevent ionic movement and zinc white rust. Use of non-destructive cross-sectioning tools like ion beam microscopy to analyze coating layers and corrosion products. 24:51 - Corrosion Products and Hydrolytic Pressure Zinc corrosion products can lead to water-filled cavities, causing hydrolytic pressure that separates the coating from the metal. Increased osmotic pressure from higher zinc concentration in water films pushes more water into the metal-coating interface. Understanding salt concentrations and pigment distributions in coatings to prevent corrosion and improve durability. 30:55 - Short-term Humidity Exposure Short-term humidity exposure can cause severe visual differences, cracks, and tensions within the coating matrix, compromising integrity. Comparison of different coatings, such as zinc iron, and their susceptibility to cracking under humidity. Understanding the sacrificial protection mechanism of galvanizing layers like zinc. 36:58 - Environmental Exposure Effects Environmental exposure can cause long-term changes not visible in initial inspections. Algae growth on coatings poses challenges, especially in Finland, with cleaning methods including pressurized water or detergents. Studying algae growth mechanisms through SEM imaging and EDS analysis provides valuable insights. EDS element mapping reveals coating composition, identifying elements like chlorine, chromates, silica, and iron, and microcracks facilitating algae growth. 43:12 - Corrosion Investigation Tools Cross-sectioning and EDS are valuable for investigating and slowing down corrosion by understanding processes within materials. Webinars offer opportunities to explore methods, sample preparation, and other areas of interest. Emphasis on effective presentation, audience engagement, and feedback for future webinar content.
- Vuosi
- 2024
- Kesto
- 46 min 49 s
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