电泳涂装：若电泳涂装不严格符合各种工艺工艺的要求，如烘烤时间长槽液污染槽液成分不合格等。铝型材表面为粗糙发泡针孔或收缩清漆色斑低光泽不均匀的漆膜，型材表面有裂纹等表面缺陷。

Electrophoretic coating: If the electrophoretic coating does not strictly meet the requirements of various processes, such as long baking time, contamination of the tank liquid, and unqualified composition of the tank liquid. The surface of aluminum profiles is a rough foaming pinhole or a paint film with low gloss and uneven shrinkage varnish spots, and there are surface defects such as cracks on the profile surface.

阳极氧化：氧化膜易与杂质混合，变黄；材料易粘在一起，使型面氧化颜色不均匀，形成彩虹色，造成产品外观不良；型面和冷床易形成黑色。K点或白点；电解液温度过高或电解时间过长，造成铝型材表面。白色不透明粉末；在氧化过程中，如果剖面下降，容易引起短路；如果碱腐蚀时硫酸浓度控制不好，则剖面表面的耐腐蚀性会降低；氧化膜表面也容易发生。骨灰发黑或外观质量问题。

Anodizing: The oxide film is easily mixed with impurities and turns yellow; The materials are easy to stick together, causing uneven oxidation color on the surface, forming a rainbow color, and causing poor product appearance; The profile and cooling bed are prone to forming black. K dots or white dots; High electrolyte temperature or prolonged electrolysis time can cause the surface of aluminum profiles. White opaque powder; During the oxidation process, if the profile decreases, it is easy to cause short circuits; If the concentration of sulfuric acid is not well controlled during alkaline corrosion, the corrosion resistance of the profile surface will decrease; The surface of the oxide film is also prone to occurrence. Blackening of ashes or appearance quality issues.

粉末涂料：如果原料的质量不好，有粉尘或杂质混入，会在型材表面产生颗粒;压缩空气不干净，与油或水混合也会造成铝型材表面的收缩缺陷;不合理的匹配会影响铝型材产品的物理性能和耐化学性，如硬度，抗冲击性和抗弯性;它还会导致型材表面外观不良而没有粉末和变黄。

Powder coating: If the quality of the raw materials is poor and there is dust or impurities mixed in, particles will be generated on the surface of the profile; Compressed air that is not clean and mixed with oil or water can also cause shrinkage defects on the surface of aluminum profiles; Unreasonable matching can affect the physical properties and chemical resistance of aluminum profile products, such as hardness, impact resistance, and bending resistance; It can also cause poor appearance of the profile surface without powder and yellowing.