Bearing Solutions for Exposure to
Acids / Alkalis / Saltwater / Blood
From medical blood pumps to chemical processing equipment, from marine offshore installations to food processing lines — corrosive media impose demanding challenges on miniature bearing materials, surface treatments, and seal designs. myonic and the MinebeaMitsumi Group provide comprehensive corrosion-resistant bearing solutions encompassing stainless steel, hybrid ceramic, specialty coatings, and biocompatible lubricants.
Critical challenges in corrosive environments
Different corrosive media attack bearing materials through distinct mechanisms — correctly identifying the media type is the first step in material selection.
Chemical Media Attack
Strong acids, strong alkalis, and chloride ions can trigger pitting corrosion and intergranular corrosion in standard bearing steels within short periods, causing surface spalling and precision degradation. Corrosive gases in chemical processes similarly pose long-term threats to ring and ball surfaces.
Biological Fluids (Blood)
Blood is a highly electrochemically active corrosive medium containing chloride ions, proteins, and enzymes that accelerate oxidation and pitting of bearing steel. Blood pump and surgical instrument bearings must operate reliably for extended periods under media-lubricated conditions.
Saltwater & Marine
Chloride ions in marine salt spray and saltwater are the primary factor causing bearing steel pitting corrosion. Offshore equipment and underwater device bearings must pass salt spray tests of 1,000 hours or more, ensuring long-term reliability in harsh marine environments.
Cleaning & Disinfection Agents
Medical instruments and food equipment must undergo repeated contact with strong cleaning agents, disinfectants, and steam jet cleaning after use. Standard seals and lubricants are prone to swelling and failure in these media — chemically resistant materials and seal designs are required.
Purpose-engineered for corrosive environments
myonic provides tiered corrosion-resistant solutions from material upgrades to fully customized designs, flexibly configured based on the severity of media corrosiveness.
Corrosion-Resistant Stainless Steel Bearings
Using nitrogen-enhanced martensitic stainless steel with significantly improved corrosion resistance over standard 440C steel, suitable for medical, food, and general chemical corrosion environments.
- Nitrogen-enhanced martensitic stainless steel: significantly improved corrosion resistance over standard 440C
- SV30 steel passes 1,000-hour salt spray testing with only slight corrosion
- 300 series stainless steel cage, medical standard configuration
- Biocompatible lubricants compliant with DIN EN ISO 10993
- Applicable scenarios: blood contact, saltwater environments, general chemical media
Hybrid Ceramic Corrosion-Resistant Bearings
Silicon nitride (Si₃N₄) or zirconia (ZrO₂) ceramic balls paired with stainless steel rings, offering excellent chemical inertness against acids, alkalis, and blood — suitable for media-lubricated or media-contact applications.
- Ceramic balls (Si₃N₄, ZrO₂, SiC): chemically inert to acids, alkalis, and blood
- SV30 steel + ceramic ball hybrid design for media self-lubrication applications
- Low density, high hardness, reducing contact stress and wear
- PTFE and fluoropolymer seals for enhanced chemical resistance
- Applicable scenarios: blood pumps, chemical analysis instruments, saltwater pipelines
Full Ceramic Bearings & Specialty Coating Solutions
Full ceramic bearings provide the highest level of chemical inertness for strong acid and alkali environments; DLC and TiN coatings significantly enhance surface corrosion and wear resistance while maintaining steel ring structural strength.
- Full ceramic bearings: suitable for strong acid, strong alkali, and high-purity medical environments
- DLC (diamond-like carbon) coating: extremely low friction coefficient and high chemical inertness
- TiN (titanium nitride) coating: enhanced surface hardness and corrosion resistance
- NSF H1/H2 certified lubricants for food-grade contact applications
- Applicable scenarios: aggressive chemical processing, food production, pharmaceutical equipment
Real-world corrosion-resistant bearing applications
The following showcases typical application scenarios and key technical highlights of miniature bearings in corrosive environments across industries.
Some images on this page are AI-generated illustrations used where authentic photographs are not readily available. They are for visual reference only and do not represent actual product appearance or specifications.
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