Method for protecting paired metal force-transmitting machine el

Details Method for protecting paired metal force-transmitting machine el Method for protecting paired metal force-transmitting machine el

1983-09-19

1986-07-15

Lacey, David L.

Chemistry: electrical and wave energy

Processes and products

204 46R, 204 52R, 428594, 428660, 428671, 428591, C25D 338

Patent

active

046004793

ABSTRACT:
Paired metal force-transmitting machine elements are protected against fretting corrosion under dynamic or oscillating load or stress conditions by a protection layer between pairing surfaces, whereby a direct contact between these pairing or junction surfaces is avoided. The protection layer is a material having a different composition than that of the machine elements. The protection layer is applied between the paired surfaces and to at least one of the paired surfaces. The protection layer has a different crystal structure and a lower hardness than titanium material of which the machine elements are made. The protection layer is galvanically applied and is advantageously of copper, aluminum or silver, whereby the thickness is 5-50 .mu.m. In this way the fretting fatigue durability of machine elements made completely or partially of titanium materials is greatly improved in a simple manner.

REFERENCES:
patent: 4162813 (1979-07-01), Mashburn et al.
patent: 4188079 (1980-02-01), Mori
patent: 4215181 (1980-07-01), Betts
patent: 4233487 (1980-11-01), Moriki et al.
patent: 4289631 (1981-09-01), Luxemburg
patent: 4452866 (1984-06-01), Kamiya et al.
"Ueber den Einfluss der Oberflaeche auf die Entstchung von Reibkorrosion" von W. Funk, Darmstadt, pp. 362 to 367, Metalloberflaeche 22 Jg. 1968 Heft 12.
"Forschungshefte Forschungskuratorium Maschinenbau e.v.", Heft 56, 1976, Reibkorrosion-Abschlussbericht, pp. 1, 131-139.

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