Mini-Flex offers the passivation process to machined parts only.
Formed Metal Bellows:
Mini-Flex does not recommend passivation to a metal bellows due to the possibility of acid entrapment. Electropolish is an approved replacement to passivation.
Bellows tubing typically does not require passivation, but the application may be performed in a tested and controlled environment to remove scale and oxidation.
Mini-Flex offers passivation process for machined parts, as required by customer.