ASTM F1940 – Standard Test Method for Process Control Verification to Prevent Hydrogen Embrittlement in Plated or Coated Fasteners
This test method covers a procedure to prevent, to the extent possible, internal hydrogen embrittlement (IHE) of fasteners by monitoring the plating or coating process, such as those described in Specifications F1137 and F1941.
The process is quantitatively monitored on a periodic basis with a minimum number of specimens as compared to qualifying each lot of fasteners being plated or coated.
Trend analysis is used to ensure quality as compared to statistical sampling analysis of each lot of fasteners.
coating; delayed failure; displacement control; EHE; fasteners; hydrogen embrittlement; IHE; incremental step load; loading rate; plating; steel; threshold