Hiwin HG Series Linear Rails

Everyone knows that rust is a common phenomenon in metals. Linear guides are made of carbon steel and do not have rust prevention function. They mainly rely on surface coating with anti rust oil to prevent rust. There are many factors that can cause rust on linear guides, which can be summarized as follows:

1、 The scratched area will corrode first.

The movement of the linear guide slider is achieved by rolling the ball in the raceway, and there is a gap between the slider and the guide groove. After the guide rail slider works for a period of time, hard sand particles or metal shavings accumulate in the gap, which will rub against the surface of the guide rail to a certain extent, scratch the surface of the groove, increase the roughness of the groove surface, and even form micro pits. The rougher the surface of the linear guide, the easier it is to focus on external pollutants and reduce its rust resistance. If the scratched surface exposes the base surface at the same time and the guide rail oil cannot be replenished from other locations in a timely manner, then that location will completely lose its rust protection.

2、 Sweat can easily cause rust on linear guides.

Avoid direct contact with the guide rail with your hands, as sweat in your hands can cause rusting of the linear guide rail. Especially when the weather is hot, operators should first wear gloves, finger cots, or specialized tools. Human sweat is a colorless, transparent or pale yellow liquid with a salty taste and weak acidity, with a pH value of 5-6. In addition to sodium, potassium, calcium, and magnesium salts, it also contains small amounts of organic acids such as urea, lactic acid, and citric acid. When human sweat comes into contact with metal, a sweat film forms on the metal surface, which can cause electrochemical reactions and corrode the metal.

3、 Poor operating environment

It is understood that during the humid and rainy season every year, the frequency of rusting on linear guides is particularly high, especially in coastal areas. The main reason is that the anti-wear agents such as sulfur and phosphorus in the guide rail oil are hydrolyzed under the action of the main component of cutting fluid water, which has serious corrosiveness to steel parts.

HG Series,Linear Rails