关键词 雪花状斑点风冷淬火淬火固溶
Discussion on Snow Spots Emerged on the Surface of
Aluminium Profile after Alkali Etching
Aluminium Profile after Alkali Etching
Liu Jingxun
(Aluminium Processing Factory,Aluminium Company of Shandong,Zibo,255052,China)
(Aluminium Processing Factory,Aluminium Company of Shandong,Zibo,255052,China)
Abstract Snow spots emerged from the surface of aluminium profiles after alkali etching are discussed.When Zn is more than 0.02wt%,and Ga is more than 0.03wt%,aluminium profiles of 6063 alloy anodized can easily create snow spots on their surfaces.Industrial experiments showed that to produce hollow large cross-section profile can easily create snow spots in summer with 6063alloy ingot which contains Zn 0.027wt%～0.057wt%,but the snow spots can'tbe easily appeared in winter with these ingots.
Keywords snow spots;quenching with forced air;quenching solution
Keywords snow spots;quenching with forced air;quenching solution
1997年夏季我厂生产的6063铝合金型材，经脱脂和碱蚀后，铝型材表面上出现了雪花状斑点或雪花痕腐蚀（见图1）。雪斑的大小不一，较大的直径在5.2mm。有的铝型材表面上的雪斑密密麻麻，每平方厘米面积上多达90个。6m长的铝型材上雪斑点的分布是不规律的：有的是这一端有，另一端没有；有的是这个面有，另一个面没有；还有的是几个面都有。
图1 6063铝型材表面雪花状斑点
1997年6月中旬生产的60.363t铝型材，出现雪斑13.867t，占22.97%,整个夏季铝型材生产中，共判为雪斑型材64.637t。雪斑缺陷给工厂生产造成了损失。为了探讨雪花状斑点型材的质量缺陷，查清原因，我们进行了跟踪试验。
1 试验
1.1 取样分析Zn含量
对氧化后出现雪斑的型材，取样分析Zn含量。见表1。
对氧化后出现雪斑的型材，取样分析Zn含量。见表1。
表1夏季生产出现雪斑型材的Zn含量%
| 断面积/cm2 | 型号 | 型材类型 | Zn含量 |
| 14.376 | 15001 | 空心 | 0.056 |
| 14.376 | 15001 | 空心 | 0.049 |
| 1.87 | 7001 | 实心 | 0.083 |
| 1.87 | 7001 | 实心 | 0.046 |
| 5.34 | 4611 | 空心 | 0.039 |
| 2.15 | 9006 | 实心 | 0.053 |
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