A terminal sealed portion (30) is formed on an end portion of a hollow rod (20) made of steel. An enclosed space (32) is formed on an inner side of the hollow rod (20). At an end of the enclosed space (32), a terminal gap (32a) is formed. A volatile powdered rust inhibitor (70) is supplied in the enclosed space (32). As the volatile powdered rust inhibitor (70) is vaporized, the enclosed space (32) is turned into a rust-inhibiting atmosphere. As the vaporized component of the volatile powdered rust inhibitor (70) is adsorbed to an inner surface (32c) of the enclosed space (32), an inner surface rust-inhibiting film (71) is formed. The vaporized component also enters inside the terminal gap (32a), and forms a terminal rust-inhibiting film (72).
HOLLOW SPRING MEMBER AND MANUFACTURING METHOD THEREFOR
HOHLFEDERELEMENT UND HERSTELLUNGSVERFAHREN DAFÜR
ELÉMENT DE RESSORT CREUX ET SON PROCÉDÉ DE FABRICATION
2021-03-03
Patent
Electronic Resource
English
Hollow spring member and hollow spring member production method
European Patent Office | 2021
|HOLLOW SPRING MEMBER AND HOLLOW SPRING MEMBER PRODUCTION METHOD
European Patent Office | 2019
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