Determination of Hydrogen in Aluminum

Hydrogen gas has a high solubility in molten Aluminum and is readily introduced during processing. Once solidification begins, the solubility decreases approximately twenty-fold, and Hydrogen is forced out of the Aluminum. Although most of the Hydrogen is diffused, a small percentage may get trapped, creating Hydrogen-filled voids. This remaining Hydrogen gas is the root cause of numerous failure mechanisms in Aluminum products, such as voids in casting and blisters in sheets. As a result, the determination of total, surface, and bulk Hydrogen content in Aluminum is a critical quality control procedure for ensuring material integrity and performance.