This test is often performed for automotive companies to determine how suitable a lubricant is for lubricating parts such as bearings that contain copper or copper alloys because corrosion can cause premature bearing failures. ASTM/NACE G31 12a Standard Guide for Laboratory Immersion Corrosion Testing of Metals Standard. These ranges include freshly polished, slightly tarnished (1a to 1b), moderately tarnished (2a to 2e), dark tarnish (3a to 3b), and corrosion (4a to 4c). TM0169-2000, Laboratory Corrosion Testing of Metals Standard. The technician will report the results as a number followed by a letter according to the ASTM ranges. Nye lab technicians are highly skilled in this test as they have conducted countless copper corrosion tests, thus, making them experts. This test is subjective as the results are determined by the eyes of the individual technician performing the test. The copper strip is then visually compared to the ASTM Copper Strip Corrosion Standards. Both the time and temperature conditions can be varied according to your product application.Īt the end of this heating period, the technician will remove the copper strip from the grease, wiping off the excess grease and then washing the copper coupon with acetone. of the devices or other material samples, which are made of metal. Description This test method covers components of ferrous metal fastener assemblies, excluding those of stainless steel, such as.
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Commonly used test conditions are 100☌ +/- 1☌ for 24 hours +/- 5 minutes. ASTM F2129: Standard Test Method for Conducting Cyclic Potentiodynamic Polarization. ASTM D6294/D6294M: Standard Test Method for Corrosion Resistance of Ferrous Metal Fastener Assemblies Used in Roofing and Waterproofing pdf Download File Size 57.45 KB. The sample is then totally immersed into a tightly packed sample of grease which is heated in an oven or liquid bath at a specified temperature for a defined period of time. The test begins by the technician polishing a copper strip sample. A copper corrosion test is performed to ensure that a grease will protect the metal surfaces it comes in contact with over time.
This video will feature copper corrosion tests, also known as ASTM method D-4048.
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