Titanium other Metals and Alloys

਍ഀ ਍ഀ Titanium ਍ഀ Alloys. ਍ഀ

਍ഀ Titanium ਍ഀ alloys are high in cost and difficult to form and fabricate. Many of the alloys ਍ഀ are, however, essentially immune to corrosion in a wide variety of environments.

਍ഀ ਍ഀ General ਍ഀ Corrosion Performance.

਍ഀ Titanium ਍ഀ alloys are essentially resistance to general corrosion in most environments at ਍ഀ ambient temperature. They are essentially immune to crevice attack and pitting. ਍ഀ At elevated temperatures they can be subject to pitting and crevice corrosion in ਍ഀ some environments.

਍ഀ ਍ഀ Stress ਍ഀ Corrosion Cracking.

਍ഀ Some of the ਍ഀ titanium alloys are subject to਍ഀ ਍ഀ stress corrosion cracking. The commercially pure (CP) alloys and Alloy ਍ഀ 6Al-4V are the most commonly used alloys and are resistant to stress corrosion ਍ഀ cracking in most environments. Use of these alloys is recommended unless higher ਍ഀ strength is specifically required. Other alloys may be resistance to stress ਍ഀ corrosion cracking but must be evaluated for each specific application.

਍ഀ ਍ഀ Other Alloys ਍ഀ and Materials.

਍ഀ Several ਍ഀ materials that are either effectively immune to corrosion in many environments ਍ഀ or have other unique properties are available for use in special applications.

਍ഀ ਍ഀ Cobalt ਍ഀ Alloys. ਍ഀ

਍ഀ Stellite 6 ਍ഀ is a cobalt based alloy that is widely used for a combination of abrasion and ਍ഀ corrosion resistance. It is difficult to form and fabricate but can be used when ਍ഀ its relatively high yield strength (90 ksi), abrasion resistance, and immunity ਍ഀ to corrosion are required. MP-35N is another cobalt based alloy that is widely ਍ഀ used as an aerospace fastener material. Its combination of extremely high yield ਍ഀ strength (285 ksi) and immunity to corrosion are unique. The potential of cobalt ਍ഀ alloys are cathodic to most other metals.

਍ഀ ਍ഀ Noble ਍ഀ Metals. ਍ഀ

਍ഀ Gold and platinum are essentially inert in most ਍ഀ environments. Gold is sometimes used as a plating on copper alloys to improve ਍ഀ electrical contact resistance.  ਍ഀ Platinum is primarily used as an anode material for impressed current cathodic ਍ഀ protection. It is either used as wire anodes or is bonded to titanium or niobium ਍ഀ supports. Platinum and gold are cathodic to most other metals.

਍ഀ ਍ഀ Lead Alloys.

਍ഀ Lead and ਍ഀ lead alloys਍ഀ ਍ഀ corrode uniformly at a low rate in many environments where the protective ਍ഀ film of corrosion products formed on their surface is insoluble. However, in the ਍ഀ presence of nitrates, acetates, or chlorides, lead alloys can corrode ਍ഀ non-uniformly as the corrosion products formed are not protective. Lead-tin ਍ഀ solder corrodes in a similar manner.

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