过去，由此生成的气态氟化物直接排入大气。
Previously, gaseous fluorides resulting from this process were discharged directly into the atmosphere.
含有0.1%或更少的活泼氟化物(认为是HF)的气态NF 3被发现对于几种不同的母材和焊接金属试验品是没有腐蚀性的。
Gaseous NF3 containing 0.1% or less active fluorides (calculated as HF) was found to be noncorrosive toward several different parent and welded metal specimens.
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