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发明公开
CN106939419A 压铸铝洗白钝化工艺 无效 - 驳回

压铸铝洗白钝化工艺
摘要：
本发明涉及一种压铸铝洗白钝化工艺，包括如下步骤：先将工件进行机械打磨抛光，然后进行除硅、喷砂、去油、钝化，最后进行清洗和烘干；在除硅步骤中，采用氢氟酸和硝酸的混合液，其中氢氟酸的质量百分比为20～25％，硝酸的质量百分比为75～80％，将工件在氢氟酸和硝酸的混合液中放置30～90s，然后取出进行后续步骤；在钝化步骤中，采用重铬酸钾、硝酸和水的混合液，其中重铬酸钾的质量百分比为3～5％，硝酸的质量百分比为15～17％，水的质量百分比为78～80％，将工件在重铬酸钾、硝酸和水的混合液中放置3～10分钟。通过上述工艺所制得的产品洁白美观、抗指纹、耐腐蚀。
摘要（英）：

The invention relates to a white-washing and passivating technique for die-cast aluminum. The white-washing and passivating technique for the die-cast aluminum comprises the steps that a workpiece is mechanically polished firstly, then silicon removal, sand blasting, deoiling and passivating are conducted, and finally cleaning and drying are conducted. In the step of silicon removal, mixed liquor of hydrofluoric acid with the mass percentage being 20-25% and nitric acid with the mass percentage being 75-80% is adopted, the workpiece is placed in the mixed liquor of hydrofluoric acid and nitric acid for 30-90 s and then taken out, and the next step is executed. In the step of passivating, mixed liquor of potassium dichromate with the mass percentage being 3-5%, nitric acid with the mass percentage being 15-17% and water with the mass percentage being 78-80% is adopted, and the workpiece is placed in the mixed liquor of potassium dichromate, nitric acid and water for 3-10 min. A product prepared through the technique is pure white, attractive, resistant to fingerprints and resistant to corrosion.

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