Corrosion-resistant permanent magnet and intravascular blood pump comprising the magnet

A method for producing a corrosion-resistant permanent magnet, the method comprising:

• providing a non-magnetized magnet body,
• forming a first layer structure on the magnet body by depositing an inorganic layer on surfaces of the magnet body, depositing a linker layer on the inorganic layer, and depositing a layer of poly(2-chloro-p-xylylene) on the linker layer, and optionally
• forming a second layer structure on the first layer structure by depositing an inorganic layer on the first layer structure, depositing a linker layer on the inorganic layer, and depositing a layer of poly(2-chloro-p-xylylene) on the linker layer, and
• magnetizing the magnet body,
• wherein
• depositing of the inorganic layer of the first layer structure either comprises depositing an aluminum layer on the magnet body, or comprises depositing an aluminum layer on the magnet body and an aluminum oxide layer on the aluminum layer,
• depositing of the inorganic layer of the second layer structure comprises depositing an aluminum layer on the first layer structure, or comprises depositing an aluminum oxide layer on the first layer structure, or comprises depositing an aluminum layer on the first layer structure and an aluminum oxide layer on the aluminum layer,
• at least one of the aluminum layers is deposited by a physical vapor deposition process, and
• at least one aluminum oxide layer is deposited by an atomic layer deposition process to a thickness of at least 50 nm.