A corkscrew is used to extract corks from wine bottles. It also has a beer-bottle opener in the handle. It's a cheap, mass-produced component which needs to have sufficient lifetime and reliability to satisfy the user.
Two different alloys and two different production techniques have been used to optimise the cost and performance. Both the alloys suffer from corrosion, and efforts have been made to maintain the appearance of the corkscrew throughout its lifetime.
You can find out more by exploring the parts of the corkscrew and discovering the microstructure, composition and surface appearance.