ASTM D1743-22 PDF

Overview

ASTM D1743-22: Standard Test Method for Determining Corrosion Preventive Properties of Lubricating Greases is an internationally recognized standard developed by ASTM International. This test method evaluates the ability of lubricating greases to protect tapered roller bearings from corrosion when stored under wet conditions. By following a controlled laboratory procedure, this standard helps differentiate the relative corrosion-preventive capabilities of various grease formulations, supporting critical decisions in lubricant selection and quality assurance.

The test is based on the Coordinating Research Council (CRC) Technique L 41, which demonstrates strong correlations between laboratory results and real-world performance, particularly in grease-lubricated aircraft wheel bearings. ASTM D1743-22 reflects best practices in corrosion testing, conforming to globally accepted standardization principles.

Key Topics

• Corrosion resistance testing: Assesses the ability of lubricating greases to prevent rust or corrosion in metal bearings exposed to wet conditions.
• Test method procedure: Involves preparing and cleaning bearings, running them briefly under load to distribute the grease, exposing them to water, and storing under controlled humidity and temperature before evaluating for corrosion.
• Pass/fail evaluation: Provides a clear criterion-presence of any corrosion spot ≥1.0 mm in size determines test failure.
• Correlation to service: The method is designed to reflect in-service performance, making laboratory results relevant for real-world lubrication challenges.
• Quality and repeatability: Ensures consistent results across different laboratories by defining apparatus, conditions, and rating criteria.

Applications

ASTM D1743-22 is widely used in the lubricants industry for:

• Quality control: Manufacturers rely on this standard to verify that their lubricating grease products provide adequate corrosion protection, which is crucial for ensuring durability of mechanical components.
• Product development: Research and development teams use this method to compare new formulations and optimize corrosion resistance.
• Specification compliance: Contractual or regulatory requirements may reference ASTM D1743 to ensure all supplied greases meet minimum corrosion preventive properties.
• Aerospace and automotive sectors: Especially relevant for bearings in aircraft, automobiles, and other transport equipment where exposure to moisture can cause premature failure.
• Industrial maintenance: Maintenance professionals use the standard to select suitable greases for equipment operating in humid, marine, or wash-down environments.

Related Standards

Understanding ASTM D1743-22 is enhanced by familiarity with related standards:

• ASTM D5969: Test Method for Corrosion-Preventive Properties of Lubricating Greases in the Presence of Dilute Synthetic Sea Water Environments.
• ASTM D1193: Specification for Reagent Water, essential for test consistency and accuracy.
• CRC L 41: The foundational research technique upon which D1743 is based, widely acknowledged in the industry for its relevance to real-world performance.
• Other ASTM methods on lubricating grease performance, bearing testing, and corrosion prevention offer additional context and complementary approaches.

Practical Value

Applying ASTM D1743-22 supports:

• Minimized risk of bearing failure: By identifying greases with inadequate rust protection before use in the field.
• Improved reliability: For critical machinery and transport systems, ensuring longer service intervals and reduced downtime.
• Global trade: The method's international acceptance assists in harmonizing lubricant specifications across supply chains.

By implementing this corrosion preventive properties test, stakeholders ensure lubricating greases meet stringent protection standards, promoting equipment longevity and safety in diverse operational environments.