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发表于 2015-10-2 09:23:07
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本帖最后由 beiwei5du 于 2015-10-2 09:24 编辑
你可以参考一下A380:涉及到的hydrofluoric acid(氟化氢)都是说到其除垢(可能nitric acid+hydrofluoric acid搭配除垢能力较强,同时在专门的passivation的ASTM A967却并没有提到氢氟酸。下面为原文:
5.2 Chemical Descaling (Pickling)—Chemical descaling agents include aqueous solutions of sulfuric, nitric, and hydrofluoric acid as described in Annex A1, Table A1.1, molten
alkali or salt baths, and various proprietary formulations.
5.2.1 Acid Pickling—Nitric-hydrofluoric acid solution is most widely used by fabricators of stainless steel equipment and removes both metallic contamination, and welding and
heat-treating scales.
Tight scale may be removed by a dip in this solution for a few minutes followed by water rinse and nitric-hydrofluoric acid treatment as noted.
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