Zinc based phosphating solution is used to phosphatize the surface of steel in the telescopic spray booth, using the bath immersion method. WF phosphating agent is divided into: agent A - bath preparation agent, agent B - additive, and agent C - accelerator.

1.配制槽液：在槽中加入3/4体积的水，每25~30公斤/吨加入A剂，再加入溶于热水的氢氧化钠(每0.7公斤/吨)，zui后加水至工作面，确认酸度。伸缩喷漆房磷化即将开始时，每0.5~0.7公斤/吨加入C剂，搅拌均匀备用。

1. Preparation of tank solution: Add 3/4 volume of water to the tank, add agent A every 25-30 kilograms/ton, and then add sodium hydroxide dissolved in hot water (every 0.7 kilograms/ton). After rinsing, add water to the working surface and confirm the acidity. When the phosphating process in the telescopic spray booth is about to begin, add agent C every 0.5-0.7 kg/ton and mix evenly for later use.

2.使用工艺参数：总酸度18~35分，游离酸度0.5~1.5分，促使2 ~ 3分，温度35 ~ 45度,浸提时间5~10分钟。检查方法：用水冲洗干燥后磷化膜应呈瓦灰色，结晶细致，无斑点，未磷化零件表面无氧化物等固体沉积物残留。伸缩喷漆房磷化后，应完全用水冲洗，清洗后，磷化膜应迅速干燥。

2. Process parameters used: total acidity 18-35 points, free acidity 0.5-1.5 points, 2-3 points, temperature 35-45 degrees, extraction time 5-10 minutes. Inspection method: After washing and drying with water, the phosphating film should be tile gray, finely crystallized, without spots, and there should be no residual solid deposits such as oxides on the surface of unphosphorized parts. After phosphating in the telescopic spray booth, it should be completely rinsed with water, and the phosphating film should quickly dry after cleaning.

3.磷化液的管理。磷化液连续使用后，总酸度可用水稀释。总酸度降低时，每1.6kg/吨添加B剂可增加1个点。当游离酸增加时，每0.4公斤/吨添加氢氧化钠可降低游离酸1分，当游离酸降低时，每6公斤/吨添加B剂可提高1分，游离酸度可上升1个点。如果浴温过低或C剂加入过多或B剂加入不足，游离酸度可能会降到0.4点以下。在这种情况下，每添加0.9kg/吨B剂，游离酸度会上升0.1个点。当C剂加入量过多时，可对伸缩喷漆房彩膜进行搅拌或加热，以加速其自然挥发。

3. Management of phosphating solution. After continuous use of the phosphating solution, the total acidity can be diluted with water. When the total acidity decreases, adding agent B can increase by 1 point per 1.6kg/ton. When the free acid increases, adding sodium hydroxide every 0.4 kg/ton can reduce the free acid by 1 point. When the free acid decreases, adding agent B every 6 kg/ton can increase the free acid by 1 point. If the bath temperature is too low or too much C agent is added or too little B agent is added, the free acidity may drop below 0.4 points. In this case, for every 0.9kg/ton of agent B added, the free acidity will increase by 0.1 points. When too much C agent is added, the color film of the telescopic spray booth can be stirred or heated to accelerate its natural evaporation.

4.清洗(磷化后用水清洗)

4. Cleaning (cleaning with water after phosphating)

5.干燥(磷化，清洗后，干燥伸缩喷漆房工件被喷漆）

5. Drying (after phosphating and cleaning, the workpiece in the drying telescopic spray booth is painted)