ns are known to exist. Nickel-Chromium Alloys. Many materials within this category are useful not only to resist aqueous corrosion but also at high temperatures, where their chromium additions encourage the growth of protective oxide scales. A prime example is alloy 625 (N06625), which is used in many aggressive chemicals and hot, gaseous environments. While it is not quite as resistant to reducing acids as the Ni-Cr-Mo alloys, because of its lower molybdenum content, it is better than stainless steels in this respect. It also exhibits moderately high resistance to chlorideinduced phenomena, such as pitting, crevice corrosion, and SCC.