ASTM D8485-23 PDF

Overview

ASTM D8485-23 is the Standard Test Method for Corrosion Test for Electric Vehicle Coolants in Glassware. Developed by ASTM, this international standard provides a laboratory procedure to evaluate the corrosive effects of glycol-based electric vehicle (EV) coolants on specific metals. The method helps distinguish between coolants that are potentially harmful due to corrosion and those suitable for further service evaluation. It is a crucial screening tool for manufacturers, researchers, and quality assurance professionals in the electric vehicle industry.

Key Topics

• Purpose and Scope

  • Evaluates the impact of glycol-based coolants on metals typically used in electric vehicle thermal management systems.
  • Focuses on corrosion effects on stainless steel and aluminum, with an optional assessment of copper. Other metals can also be tested.
  • Designed as a screening test for new, unused coolant formulations without added corrosive agents.

• Test Method Highlights

  • Laboratory procedure immerses metal specimens in coolant under controlled conditions.
  • Test duration is 336 hours (two weeks) at 88°C.
  • Corrosion is assessed by measuring changes in specimen weight before and after testing.
  • Tests are performed in triplicate to account for variability and ensure reliable results.

• Test Specimens and Equipment

  • Stainless steel and aluminum are primary test specimens, with copper as an optional addition.
  • Utilizes glassware such as beakers or flasks, aerator tubes, thermometers, and condensers.
  • Equipment is assembled to maintain precise temperature, aeration rate, and cleanliness.

• Interpretation and Limitations

  • The method provides a comparative evaluation of corrosion inhibition only under controlled laboratory settings.
  • It does not assess inhibitor life, other coolant properties, or service simulative conditions.
  • The test is not a substitute for more comprehensive performance testing.

Applications

• Coolant Development and Screening

  • Early-stage screening of new EV coolant formulations for corrosion inhibition.
  • Research and development teams can quickly identify coolants that are unfit for further evaluation due to excessive corrosion potential.

• Quality Assurance in Manufacturing

  • Verification of coolant batches before approval and release to market.
  • Assurance that coolants meet baseline corrosion protection requirements for electric vehicle systems.

• Consumer and Qualification Testing

  • Third-party laboratories or qualification agencies can use the method to screen commercial coolant products.
  • Useful reference for regulatory compliance and technical specification checks in automotive supply chains.

• Industry Research

  • Investigation of the effects of various coolant compositions on popular automotive alloys.
  • Supports industry-wide efforts to standardize corrosion protection in the rapidly growing e-mobility sector.

Related Standards

• ASTM D1384 - Standard Test Method for Corrosion Test for Engine Coolants in Glassware
• ASTM D1125 - Test Methods for Electrical Conductivity and Resistivity of Water
• ASTM D1193 - Specification for Reagent Water
• ASTM D6130 - Determination of Silicon and Other Elements in Engine Coolant by ICP-Atomic Emission Spectroscopy
• ASTM E178 - Practice for Dealing With Outlying Observations
• ASTM E2470 - Specification for Polyester Grade Ethylene Glycol

These related standards provide additional guidance for evaluating coolant composition, quality, and performance in both electric and conventional vehicle applications.

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