It is planned to use the highly corrosion resistant titanium grade 7 (Ti Gr 7) and a high strength titanium alloy (Ti Gr 29) to fabricate the drip shield for the Yucca Mountain repository. Ti Gr 7 contains 0.15% Palladium (Pd) to increase its corrosion performance, mainly under reducing conditions. It was important to determine the corrosion behavior of Ti Gr 7 in concentrated brines at temperatures higher than 100°C, which may represent the behavior of dust deliquescence solutions. Tests were performed in concentrated NaCl + KCl solutions containing also nitrates and fluorides. Results show that Ti Gr 7 was highly resistant to general and localized corrosion. Some specimens were polarized to potentials higher than 4 volts. None of the tightly creviced specimens suffered crevice corrosion. The presence of fluoride promoted localized corrosion around the edges of the crevice former.
展开▼
机译：计划使用高耐腐蚀的钛级7（Ti GR 7）和高强度钛合金（TI GR 29），以制造丝兰山地储存库的滴水屏蔽。 TI GR 7含有0.15％钯（Pd），以提高其腐蚀性能，主要是在还原条件下。重要的是要在高于100℃的温度下确定TI GR 7在浓缩盐水中的腐蚀行为，这可能代表粉尘脱发溶液的行为。在含有硝酸盐和氟化物的浓缩NaCl + KCl溶液中进行试验。结果表明，TI GR 7对一般和局部腐蚀具有高抗性。一些标本被极化到高于4伏的电位。没有紧密克雷奇的标本遭受缝隙腐蚀。氟化物的存在促进了围绕缝隙成形器的边缘的局部腐蚀。
展开▼
