现代航空发动机中有大量的不锈钢、镍基合金和钛合金零件要用酸洗的方法除去热处理所产生的氧化皮。这些零件大都是钣金、焊接件,也有少量的锻铸件(本文只涉及钣金、焊接件)。就其基体材料而言,大体上可分为铁素体不锈钢、奥氏体不锈钢、镍基高温合金、钛及钛合金等四大类。目前,国内外大都趋向于采用“复合式酸洗”的工艺方法。习惯上,把直接在酸洗溶液中除氧化皮的方法称之为“单一式酸洗”,而把在酸洗前增加一道预处理工序,使氧化皮变得疏松易除,然后再酸洗的方法,称之为“复 Modern aero-engines have a large number of stainless steel, nickel-based alloys and titanium alloy parts to be used pickling method to remove the scale produced by heat treatment. Most of these parts are sheet metal, welding parts, but also a small amount of forging (this article only relates to sheet metal, welded parts). In terms of its matrix material, it can be divided into four categories: ferritic stainless steel, austenitic stainless steel, nickel base superalloy, titanium and titanium alloy. At present, most of the domestic and foreign tend to adopt “composite pickling” process. Traditionally, the method of descaling directly in a pickling solution is referred to as “single pickling”, while adding a pretreatment step prior to pickling to make the scale loose and easy to remove, followed by pickling The method, called "complex