钢制闸门的表面在热喷涂之前，要把闸门金属表面的铁锈、氧化皮、油污、焊渣、灰尘、水分等杂物清除完毕，让钢闸门全部露出灰白的金属原色，一定要保证干燥，也可以有一定的粗糙度，为了保证热喷涂料和钢闸门有良好的附着力。具体方法如下：
The surface of steel gate in thermal spraying before the gate metal surface rust, oxide skin, oil, welding slag, dust, moisture and other debris cleared, let all exposed metal color steel gate gray, must ensure that the dry, can also have a certain roughness, to ensure thermal spray coating and good adhesion to steel gate. The specific methods are as follows:
喷砂处理施工要求
Construction requirements of sand blasting treatment
清除杂物的方法应该采用喷射或抛射，大部分采用喷射，就是人们经常说的喷砂除锈。
The method of cleaning the sundries should be ejected or ejected, most of which are ejected, which is often described as sand blasting.
喷砂机是喷砂处理设备，在必要的条件选取合适的磨料，可以达到高质量的表面处理效果。喷砂采用气操作压力不能小少于0.5Mpa，配备6m3／Sr空气压缩机。采用流动式空气压缩机时，它的排气量为6m3／s，额定压力为0.8Mpa，功率为37kw。喷砂处理用的压缩空气必须经过冷却装置以及油水分离器处理，为了保证压缩空气的干燥、没有油。油水分离器一定要定期清理。喷砂的时候喷嘴尺寸为6～8mm，在使用过程中，由于磨损，孔口直径增大了25％时应该换喷嘴。喷嘴到闸门金属表面应保持100～300mm的距离。喷射方向与闸门金属表面法线的夹角以15°－30°为宜。喷砂用的材料有很多，性能各不相同，一般采用强度较高的石英砂。材料使用前应该保持干燥，水量不可以大于1％，否则必须进行炒砂或烘干处理。对材料的料径也有要求，值应在0.75－3.0mm之间。
Sandblasting machine is a sand spray treatment equipment, the necessary conditions to select the appropriate abrasive, can achieve high quality surface treatment effect. The air injection pressure can not be less than 0.5Mpa, and the air compressor is equipped with 6m3 / Sr air compressor. When the flow type air compressor is used, its exhaust volume is 6m3 / s, the rated pressure is 0.8Mpa, and the power is 37KW. The compressed air for sand injection treatment must be treated by the cooling device and the oil-water separator in order to ensure the drying of compressed air and no oil. The oil-water separator must be cleaned regularly. The size of the nozzle is 6 ~ 8mm at the time of sand blasting. In the process of use, the nozzle should be changed when the diameter of the hole is increased by 25%. The distance between the nozzle and the metal surface of the gate should be kept from 100 to 300mm. The angle between the jet direction and gate metal surface normal to 15 degrees to 30 degrees. There are many materials used in sand blasting, and the properties are different. Generally, the quartz sand with high strength is used. The material should be kept dry before use, and the amount of water can not be greater than 1%. Otherwise, it is necessary to stir fry or dry. The material's diameter is also required, and the value should be between 0.75 and 3.0mm.