过去我厂制造的不锈钢阀门,由于高温铸造和热处理导致表面产生一层很厚的而且不均匀的黑色氧化皮,如果不除掉,会给使用单位的生产带来很坏的影响。经过碱-酸洗后去除了氧化皮的不锈钢阀门具有银白色或银灰色的钝化态表面,既清洁又耐腐蚀。同时阀门表面上的铸造缺陷均裸露出来,便于宏观检查和进行修补,这对提高阀门的铸造质量起着极为重要的作用。 In the past, stainless steel valves manufactured by our factory produced a very thick and uneven black oxide scale on the surface due to the high temperature casting and heat treatment. If they were not removed, it would have a bad effect on the production of the use units. Stainless steel valves that have been degreased by alkali-pickling have a silver-white or silver-gray passivated surface that is both clean and corrosion-resistant. At the same time casting defects on the valve surface are exposed, easy to macro-inspection and repair, which to improve the quality of the valve casting plays an extremely important role.