Event Title
Location
Cherry Auditorium Kirk Hall
Start Date
2-10-2011 1:00 PM
Description
This talk will be cover two areas of corrosion mitigation. In the first portion, an alternative to chromates will be discussed, while in the second portion, some thoughts on a new process to mitigate hydrogen embrittlement will be presented.
Chromate conversion coatings provide excellent corrosion resistance to many metals in marine environments. But chromates are deemed environmentally unfriendly, so an alternative coating with the same properties is sought. To date, a titanate based coating has been found to provide good corrosion resistance on aluminum alloy 2024 T3 without degrading mechanical properties. Using a modified process, a titanate coating also replaced a chromate primer for adhesive bonding, a technology widely used in light components. Extension of the titanate technology to other aluminum alloys has not been simple. The compositional differences between alloys produce issues with chemical cleaning resulting in poor repeatability of corrosion protection. These issues will be discussed in this talk.
In the second area, hydrogen embrittlement is a delayed failure that can be catastrophic. One technique to avoid embrittlement is to decrease the amount of atomic hydrogen entering the metal. Earlier work suggested that the presence of a surface component with a high recombination rate of hydrogen atoms to hydrogen molecules will significantly decrease the atomic hydrogen entering the metal and so improve hydrogen embrittlement resistance. Some thoughts on how this can be achieved using nano-particles will be presented.
Replacement of Chromates and Design of a Nanotechnology Coating for Hydrogen Embrittlement Mitigation
Cherry Auditorium Kirk Hall
This talk will be cover two areas of corrosion mitigation. In the first portion, an alternative to chromates will be discussed, while in the second portion, some thoughts on a new process to mitigate hydrogen embrittlement will be presented.
Chromate conversion coatings provide excellent corrosion resistance to many metals in marine environments. But chromates are deemed environmentally unfriendly, so an alternative coating with the same properties is sought. To date, a titanate based coating has been found to provide good corrosion resistance on aluminum alloy 2024 T3 without degrading mechanical properties. Using a modified process, a titanate coating also replaced a chromate primer for adhesive bonding, a technology widely used in light components. Extension of the titanate technology to other aluminum alloys has not been simple. The compositional differences between alloys produce issues with chemical cleaning resulting in poor repeatability of corrosion protection. These issues will be discussed in this talk.
In the second area, hydrogen embrittlement is a delayed failure that can be catastrophic. One technique to avoid embrittlement is to decrease the amount of atomic hydrogen entering the metal. Earlier work suggested that the presence of a surface component with a high recombination rate of hydrogen atoms to hydrogen molecules will significantly decrease the atomic hydrogen entering the metal and so improve hydrogen embrittlement resistance. Some thoughts on how this can be achieved using nano-particles will be presented.
Comments
Downloadable file is a PDF of the original event flier.