CNC加工件用高压水射流去完毛刺，表面看着光洁干净，放了一两天，边角和孔口出现锈点。有的零件甚至当天就泛黄。车间以为是水质问题，换了纯水还是锈。排查下来，问题出在高压水冲击之后的表面状态。

CNC machined parts are deburred with high-pressure water jet, and the surface looks smooth and clean. After one or two days, rust spots appear on the corners and holes. Some parts even turn yellow on the same day. The workshop thought it was a water quality issue and replaced it with pure water, but it still rusted. After investigation, the problem lies in the surface condition after high-pressure water impact.

高压水冲击会改变金属表面的微观状态。

High pressure water impact can alter the microscopic state of metal surfaces.

高压水射流冲击零件表面时，不仅冲掉毛刺，还会对加工面产生一定的冷作硬化效果。金属表面在高速水流的反复冲击下，晶格发生畸变，表面能升高，处于一种“活化”状态。这种活化表面与空气中的氧气接触后，氧化速度比正常表面快得多。尤其是铝合金和碳钢零件，去毛刺后如果不做处理，几个小时内就可能出现氧化变色。

When high-pressure water jet impacts the surface of parts, it not only removes burrs, but also has a certain cold work hardening effect on the machined surface. Under the repeated impact of high-speed water flow, the lattice of the metal surface undergoes distortion, the surface energy increases, and it is in an "activated" state. After coming into contact with oxygen in the air, this activated surface oxidizes much faster than a normal surface. Especially for aluminum alloy and carbon steel parts, if not treated after deburring, oxidation discoloration may occur within a few hours.

毛刺冲掉之后，露出的新鲜金属没有保护。

After the burrs are removed, the fresh metal exposed is not protected.

毛刺本身是金属，冲掉毛刺意味着原本被毛刺覆盖的基体金属暴露出来。这部分金属没有经过钝化处理，也没有油膜保护，直接暴露在空气中。如果车间湿度高，或者零件表面残留水分，锈蚀几乎是必然的。

The burr itself is metal, and removing the burr means that the base metal originally covered by the burr is exposed. This part of the metal has not been passivated or protected by an oil film, and is directly exposed to the air. If the humidity in the workshop is high or there is residual moisture on the surface of the parts, corrosion is almost inevitable.

防锈处理建议紧跟在去毛刺之后。

Rust prevention treatment must be carried out immediately after deburring.

正规的工艺流程是：高压水去毛刺→漂洗→脱水→防锈处理。防锈处理有几种方式：浸泡水基防锈剂、喷涂防锈油、或者做钝化处理。水基防锈剂环保但防锈期短，适合工序间周转；防锈油防锈期长但后续装配前需要清洗；钝化处理适合不锈钢和铝合金，能形成致密的氧化膜。选择哪种，取决于零件的材质和后续工序要求。

The formal process is: high-pressure water deburring → rinsing → dehydration → rust prevention treatment. There are several ways to prevent rust: soaking in water-based rust inhibitors, spraying rust proof oil, or performing passivation treatment. Water based rust inhibitors are environmentally friendly but have a short rust prevention period, making them suitable for inter process turnover; Rust proof oil has a long rust prevention period but needs to be cleaned before subsequent assembly; Passivation treatment is suitable for stainless steel and aluminum alloys, and can form a dense oxide film. The choice depends on the material of the parts and the requirements of subsequent processes.

烘干不有效，防锈做了也白做。

The drying is not thorough, and even if rust prevention is done, it is useless.

零件从清洗机出来后，表面和盲孔里会残留水分。如果烘干不有效就喷防锈油，水分被封在油膜下面，反而加速锈蚀。盲孔和深孔的烘干尤其要重视——热风要能吹进去，或者用真空干燥的方式把水分抽出来。烘干后的零件表面温度不能太高，否则喷防锈剂时溶剂快速挥发，防锈膜不均匀。

After the parts come out of the cleaning machine, there will be residual moisture on the surface and in blind holes. If the drying is not thorough and rust proof oil is sprayed, the moisture will be sealed under the oil film, which will accelerate the rusting process. The drying of blind and deep holes should be particularly emphasized - hot air should be able to blow in, or water should be extracted through vacuum drying. The surface temperature of the dried parts should not be too high, otherwise the solvent will evaporate quickly when spraying rust inhibitor, and the rust proof film will be uneven.

工序间的等待时间要控制。

The waiting time between processes should be controlled.

去毛刺和防锈之间的等待时间越短越好。有的车间去毛刺和防锈是两道独立工序，中间零件堆在周转箱里等半天，这半天就足够碳钢零件生锈了。理想的做法是把去毛刺、漂洗、防锈、烘干集成在一条线上，零件从一头进，从另一头出来就是防锈状态。

The shorter the waiting time between deburring and rust prevention, the better. In some workshops, deburring and rust prevention are two independent processes. The intermediate parts are stacked in turnover boxes and wait for half a day, which is enough time for the carbon steel parts to rust. The ideal approach is to integrate deburring, rinsing, rust prevention, and drying into one line, where parts enter from one end and exit from the other end to achieve rust prevention.

CNC高压清洗机解决的是毛刺问题，但去毛刺之后的表面防护是另一个环节。去毛刺做得再好，防锈跟不上，零件还是要返工。选设备的时候，把清洗、漂洗、防锈、烘干作为一个整体流程来考虑，比只盯着高压泵的参数更实际。

The CNC high-pressure cleaning machine solves the problem of burrs, but surface protection after deburring is another step. No matter how well the deburring is done, the rust prevention cannot keep up, and the parts still need to be reworked. When selecting equipment, considering cleaning, rinsing, rust prevention, and drying as a whole process is more practical than just focusing on the parameters of the high-pressure pump.