5052铝板加工中的腐蚀与高温氧化

天物彩板专注彩涂卷行业17年——5052铝板加工厂家_彩涂铝卷今日价格趋势请拨打网站上方电话咨询

1.在盐浴中淬火或退火可能会导致工件表面腐蚀。主要原因是盐浴中氟化物含量过高，淬火后工件表面残留的盐没有彻底清理干净。因此，应提前对盐浴中使用的硝酸盐进行分析，不得使用含氟量大于05%的硝酸盐。

2.热处理后立即用热水清洗工件。尤其是铸件，由于表面粗糙，形状复杂，硝酸盐更容易隐藏。如果不彻底清洁，在使用过程中会造成腐蚀。用于清的水不得含有酸和碱。
3.空气炉内高温加热，如炉内湿度过高或含有其他有害物质（如硫化物），会加剧铝制品的高温氧化。其特征是在金属表面形成气泡或在金属表面形成空腔。气泡的出现与铝锭中由于熔炼工艺或挤压轧制工艺不当而形成的气泡非常相似，但后者在加工过程中有时沿变形方向串联排列，而前者则分散。
2、 如果避免5052铝板的腐蚀和高温氧化
1.为解决腐蚀和氧化问题，5052铝板和料筐进入炉膛前必须干燥，并仔细清洁和检查表面，不得混入任何有害异物。例如，工件在成形或加工过程中残留的润滑剂是硫化物的主要来源，必须清除。
2.如果电炉之前处理过镁合金，硫化物将留在电炉中，因为SO2通常被用作镁合金热处理的保护气氛，这也应加以防止。

Corrosion and high temperature oxidation in 5052 aluminum plate processing 1、 Possible corrosion and high temperature oxidation problems in 5052 aluminum plate processing 1. Quenching or annealing in the salt bath may cause corrosion on the surface of the workpiece. The main reasons are that the fluoride content in the salt bath is too high and the residual salt on the surface of the workpiece after quenching is not cleaned thoroughly. Therefore, the nitrate used in the salt bath shall be analyzed in advance, and the nitrate with fluoride content greater than 05% shall not be used. 2. Clean the workpiece in hot water immediately after heat treatment. Especially for castings, due to rough surface and complex shape, it is easier to hide nitrate. If it is not cleaned thoroughly, it will cause corrosion in the process of use. The water used for cleaning shall not contain acid and alkali. 3. High temperature heating in the air furnace, such as high humidity in the furnace or containing other harmful substances (such as sulfide), will aggravate the high-temperature oxidation of aluminum products. The utility model is characterized in that bubbles are formed on the metal surface or cavities are formed in the metal. The appearance of bubbles is very similar to that of bubbles formed in aluminum ingot due to improper melting process or improper extrusion and rolling process, but the latter is sometimes arranged in series along the deformation direction in the processing process, while the former is dispersed. 2、 If the corrosion and high temperature oxidation of 5052 aluminum plate are avoided 1. In order to solve the problem of corrosion and oxidation, 5052 aluminum plate and charging basket must be dry before entering the furnace, and the surface shall be carefully cleaned and inspected without mixing any harmful foreign matters. For example, the residual lubricant of workpiece in forming or machining is the main source of sulfide and must be removed. 2. If the electric furnace has previously treated magnesium alloy, sulfide will remain in the furnace, because SO2 is generally used as the protective atmosphere for the heat treatment of magnesium alloy, which should also be prevented.