ASTM, like other standards organizations (e.g. ISO), makes its money, and exists solely, through sales of standards. Search for and buy the standard. What you are asking breaks copyright regulations and is unethical.
The standard you are probably looking for is ASTM G31, "Standard Guide for Laboratory Immersion Corrosion Testing of Metals." You should also get ASTM G1, "Standard Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens." for when the tests have been completed. As an earlier responder has noted, we cannot simply send you the standards because they are copyrighted. They probably cost around $30 to $40 at https://www.astm.org/.