铝型材表面油痕的特性反映：
The characteristics of oil marks on the surface of aluminum profiles reflect:
铝型材时效前油渍不擦干净在时效后在铝材表面产生水印，氧化后呈暗斑且有高度。
The oil stains on the aluminum profile before aging are not wiped clean. After aging, watermarks are generated on the surface of the aluminum profile, and after oxidation, they appear as dark spots and have a height.
铝型材表面油痕产生原因：
Reasons for oil marks on the surface of aluminum profiles:
1、成品锯锯切油渍留在铝型材两头，搬（抬）料时手套不干净甚至粘有石墨灰；
1. The oil stains left on both ends of the aluminum profile during the sawing and cutting of the finished product, and the gloves were not clean or even adhered with graphite dust when moving (lifting) the material;
2、铝型材拉伸时手套脏拿料过长，锯切未去掉；
2. When stretching aluminum profiles, the gloves are dirty and the material is taken too long, and the sawing is not removed;
3、中间理料时手套脏，留“印记”；
3. Gloves are dirty and leave "marks" during intermediate material handling;
4、挤压设备工具漏滴油迹（行车，吊装带）。
4. The tools of the extrusion equipment leak oil stains (traveling crane, lifting belt).

铝型材表面油痕去除办法：
Method for removing oil marks on the surface of aluminum profiles:
1、铝材生产过程中理料，抬搬料时手套要干净，有油迹要及时擦掉；
1. During the production process of aluminum materials, gloves should be clean when lifting and transporting materials, and any oil stains should be promptly wiped off;
2、拉伸铝材时拿料要适当；
2. When stretching aluminum materials, take appropriate materials;
3、理料，抬搬料时的手套和拉伸拿料，加棒时的手套要分开；
3. Material handling, gloves for lifting and carrying materials, and gloves for stretching and taking materials, and gloves for adding rods should be separated;
4、设备，工具注意漏油，垫纸垫条吊带等要干净。
4. Attention shall be paid to oil leakage of equipment and tools, and the paper pad, strip sling, etc. shall be clean.
铝型材表面水印的特性反映：
The characteristics of the watermark on the surface of aluminum profiles reflect:
铝型材表面出现银灰色湿状印斑，铝合金型材随氧化碱洗的强度增加而减淡或消失。
Silver gray wet stains appear on the surface of aluminum profiles, and aluminum alloy profiles fade or disappear as the strength of oxidation and alkali washing increases.
铝型材表面水印产生原因：
Reasons for generating watermarks on the surface of aluminum profiles:
铝型材表面局部沾水淋雨，经型材表面淬火氧化层细微小孔渗入铝基体，形成三羟铝石，随水份停留时间长短而现明淡，如果水中有杂质（盐，亚硝酸等）会产生腐蚀斑。
Local parts of the surface of aluminum profiles are soaked in water and rain. After being quenched on the surface of the profile, the oxide layer penetrates into the aluminum matrix through fine pores, forming trihydroxyaluminite, which gradually fades with the length of the water retention time. If there are impurities (salt, nitric acid, etc.) in the water, corrosion spots will occur.
铝型材表面水印去除办法：
Method for removing watermarks on the surface of aluminum profiles:
沾水的铝型材要马上擦干，在时效前需要擦干，条件充许的话适当增加碱冼时间和氧化膜厚度。
Aluminum profiles that have been wetted with water should be wiped dry immediately and before aging. If conditions permit, the alkali washing time and oxide film thickness should be appropriately increased.