The effect of boron distribution on the intergranular corrosion (IGC) resistance of UNS S32506 duplex stainless steel (DSSs) was investigated. IGC tests in boiling nitric acid were conducted with DSSs with boron contents ranging from 1 to 50 ppm. The corrosion rate increased with increasing boron addition. Further addition of boron did not affect the IGC resistance. Microstructural observations, corrosion depth measurements, and secondary-ion mass spectrometry analysis revealed that the diminished IGC resistance was attributable to corrosion resistance degradation of α/γ interfaces due to boron segregation at the interfaces.

中文翻译：

---

硼分布对UNS S32506双相不锈钢抗晶间腐蚀性的影响

研究了硼分布对UNS S32506双相不锈钢（DSSs）耐晶间腐蚀（IGC）的影响。用硼含量范围为1至50 ppm的DSS进行了在沸腾的硝酸中进行的IGC测试。腐蚀速率随硼添加量的增加而增加。进一步添加硼不影响IGC抗性。显微组织观察，腐蚀深度测量和二次离子质谱分析表明，IGC电阻降低是由于界面处的硼偏析导致了α/γ界面的耐蚀性下降。