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在金属制品的表面处理工艺中,几乎离不开酸洗除锈活化金属表面这一道工序。在长期的生产实践中,人们找到了各种各样的方法,目前,比较普遍的是用一定浓度的硫酸或者盐酸来进行表面清洗。有一类工厂,用多次冷挤压来生产钢质筒状产品,酸洗除氧化皮对于他们更是必不可少。冷挤压件必须经过700℃高温退火,退火后其表面形成氧化皮。酸洗的目的是除去这种氧化皮并活化金属表面,以便经过磷化获得符合冷挤压要求的磷化膜。包括酸洗在内的整个磷化工艺是在一组配有液槽的耐酸不锈钢滚筒里进行的。多数这类工厂,用的是20％
In the surface treatment of metal products, almost can not do without acid pickling rust activated metal surface of this process. In the long-term production practice, people find a variety of ways, at present, it is more common to use a certain concentration of sulfuric acid or hydrochloric acid for surface cleaning. There are a class of plants that use multiple cold extrusion to produce steel tubular products that are even more indispensable to pickling and descaling. Cold extrusion must be annealed at a temperature of 700 ℃, after the formation of oxide scale on the surface. The purpose of pickling is to remove this scale and activate the metal surface to obtain a phosphate film that meets the requirements of cold extrusion through phosphating. The entire phosphating process, including pickling, is carried out in a series of acid-resistant stainless steel drums equipped with a bath. Most of these factories use 20%