Hydrogen Embrittlement Test

ST conducts Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments.

Plating/coating Processes—Unstressed test specimens are cleaned, plated/coated, and baked (if applicable) in accordance with the specification to which the process is to be qualified. Specimens are then maintained under a sustained load in air to measure the time to rupture/completion of the test period.

Service Environments—Specimens are tested in the service environment. Plated/coated test specimens are to be utilized for evaluating a service environment, then the plating/coating process must first be determined to be acceptable in accordance with above.

Significance and Use

Plating/coating Processes—This test method provides a means by which to detect possible hydrogen embrittlement of steel parts during manufacture by verifying strict controls during production operations such as surface preparation, pretreatments, and plating/coating. It is also intended to be used as a qualification test for new plating/coating processes and as a periodic inspection audit for the control of a plating/coating process.

Service Environment—This test method provides a means by which to detect possible hydrogen embrittlement of steel parts (plated/coated or bare) due to contact with chemicals during manufacturing, overhaul and service life.

To perform the SLT procedure, a proven Ring duly calibrated, equipped with the appropriate specimen grips and capable of maintaining a constant force are necessary.