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97554 EVALUATING ANTI-GALLING THREAD TREATMENTS FOR BETA-C TITANIUM FASTENERS EXPOSED TO MARINE ENVIRONMENTS

Picture for 97554 EVALUATING ANTI-GALLING THREAD TREATMENTS
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Product Number: 51300-97554-SG
ISBN: 97554 1997 CP
Author: R. Simmons, R.K. Conrad, A. Sheetz, C. Bowles
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Fasteners for top-side applications on Naval ships have historically been steel fasteners. These fasteners when exposed to marine environments suffer extensive corrosion. Alternatives such as high strength stainless steel, nickel alloy and titanium alloy fasteners are being considered. While these alternative materials offer better corrosion resistance than steel, they can suffer from thread galling when used in the uncoated andlor unlubricated condition. Solid film lubricants such as molybdenum disulfideimpregnated epoxy polyimide have shown anti-galling properties. Additionally, anti-seize compounds such as copper loaded grease have also shown anti-galling properties. In a paper on titanium as alternative fasteners, K. Faller compares titanium fasteners to steel and high strength alternative materials. In this study, Beta-C titanium fasteners are investigated as an alternative fastener for Naval use. Galvanic interactions and thread galling are evaluated to identify candidate coatings or lubricants so that Beta -C titanium fasteners can be utilized for top-side applications. Keywords: titanium, fasteners, solid film lubricants, thread treatments, galling, galvanic corrosion
Fasteners for top-side applications on Naval ships have historically been steel fasteners. These fasteners when exposed to marine environments suffer extensive corrosion. Alternatives such as high strength stainless steel, nickel alloy and titanium alloy fasteners are being considered. While these alternative materials offer better corrosion resistance than steel, they can suffer from thread galling when used in the uncoated andlor unlubricated condition. Solid film lubricants such as molybdenum disulfideimpregnated epoxy polyimide have shown anti-galling properties. Additionally, anti-seize compounds such as copper loaded grease have also shown anti-galling properties. In a paper on titanium as alternative fasteners, K. Faller compares titanium fasteners to steel and high strength alternative materials. In this study, Beta-C titanium fasteners are investigated as an alternative fastener for Naval use. Galvanic interactions and thread galling are evaluated to identify candidate coatings or lubricants so that Beta -C titanium fasteners can be utilized for top-side applications. Keywords: titanium, fasteners, solid film lubricants, thread treatments, galling, galvanic corrosion
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