Pickling Process of Alloy 625 Cold-rolled Sheets
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摘要: 采用碱洗-混酸酸洗工艺对2 mm厚625合金冷轧板进行正交酸洗试验。结果表明:625合金冷轧板最佳的酸洗工艺为:首先在500℃~550℃质量分数为80% NaOH+20% NaNO3的碱液中碱洗60 s~120 s,随后在45℃~50℃质量分数为20% HNO3+4% HF的混酸溶液中酸洗30 s~60 s,酸洗及精整后板材表面质量达到2B级,各项性能指标与进口板材相当。Abstract: The orthogonal pickling tests for 2 mm-thick 625 alloy cold-rolled sheets were conducted by using the alkali washingmixed acid pickling process. The results showed that the best pickling process for 625 alloy cold-rolled sheets is as follows:Firstly, the sheets should be alkali washed in 80% Na OH + 20% NaNO3 (w) for 60~120 s at 500~550℃ and then pickled 20% HNO3+ 4% HF for 30~60 s at 45~50℃. After pickling and finishing, the sheet surfaces of 2 B level could be ganed and performance indexes are equivalent to those of the imported sheets.
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Key words:
- 625 alloy /
- alkali washing /
- mixed-acid pickling
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