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The effect of dissolved oxygen, boric acid, and lithium hydroxide on the SCC of SUS 304 stainless steel and Inconel alloy X-750 has been studied in high temperature water using the constant extension rate tests (CERT) method. Sensitized SUS 304 stainless steel suffered IGSCC in high purity water at 290C containing more than 0.2ppm dissolved oxygen. With an increase of dissolved oxygen concentration, the IGSCC susceptibility increased. The IGSCC susceptibility was not changed by the addition of boric acid, but it became extremely lower when the pH was increased beyond 7.4 by the addition of boric acid and lithium hydroxide. On the other hand, Inconel alloy X-750 suffered IGSCC in deaerated high purity water at 350C. The IGSCC susceptibility of this alloy was not changed by the addition of boric acid, but it became higher when the pH exceeded 11.3 by the addition of lithium hydroxide. The construction of potential-pH diagrams for Cr-H2O, Ni-H2O, and Fe-H2O systems at high temperatures were performed to consider the effect of dissolved oxygen, boric acid, and lithium hydroxide. The potential-pH diagram for Cr-H2O system indicates that the corrosion potential of SUS 304 stainless steel lies near the unstable potential region of Cr2O3 at high oxygen levels. This diagram also indicates that the surface film of SUS 304 stainless steel dissolves as CrO2anions above pH 7.4. The diagram of the Ni-H2O system at 350C indicates that the surface film of Inconel alloy X-750 dissolves as HNiO2anions above pH 11.3. From these results, the relationship between the SCC in high temperature water and the potential-pH diagrams is discussed.

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The Relationship between the Stress Corrosion Cracking of SUS 304 Stainless Steel and Inconel Alloy X-750 and the Potential-pH Diagram in High Temperature Water