US 11,731,174 B2
Method of improving a corrosion protection of a hollow shaft
Rodrigo Consentino, Fellbach (DE); Michael Dohms, Bergisch-Gladbach (DE); Antonio Menonna, Ditzingen (DE); and Ralf Rieger, Steinheim a.d. Murr (DE)
Assigned to Mahle International GmbH
Filed by Mahle International GmbH, Stuttgart (DE)
Filed on Jan. 24, 2020, as Appl. No. 16/752,318.
Claims priority of application No. 102019200951.4 (DE), filed on Jan. 25, 2019.
Prior Publication US 2020/0238344 A1, Jul. 30, 2020
Int. Cl. B08B 9/032 (2006.01); B08B 5/00 (2006.01); F01L 1/047 (2006.01); B08B 5/02 (2006.01)
CPC B08B 9/0328 (2013.01) [B08B 5/02 (2013.01); F01L 1/047 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for improving a corrosion protection of a hollow shaft, comprising:
introducing a lance into the hollow shaft;
cleaning and expelling a liquid from an inside of the hollow shaft via spraying a gas from the lance;
applying a corrosion protection medium onto an inner lateral surface of the hollow shaft at least in certain regions; and
closing off the hollow shaft;
wherein closing off the hollow shaft includes connecting a plug to one longitudinal end of the hollow shaft prior to spraying the gas from the lance and prior to applying the corrosion protection medium; and
wherein applying the corrosion protection medium to the inner lateral surface of the hollow shaft includes applying the corrosion protection medium to an axially facing surface of the plug.