How To Maintain Experimental Instruments Part2
- Jul 27, 2018 -

If the instrument produces rust and mildew during use, we need to clean it. There are generally two types of methods for cleaning: mechanical cleaning and chemical cleaning. The mechanical cleaning method is performed by using a shovel, scraping, brushing, or the like. Chemical cleaning is the use of special chemicals for cleaning. The specific cleaning method should be handled according to the different conditions of different parts.

1. Steel Parts Rust And Cleaning

The degree of precision is not high or the mechanical method is used to remove rust. It is not easy to remove the steel parts. It can be rusted by chemical methods. For example, immersing the parts to be rusted with phosphoric acid with a concentration of 2 to 25%, and heating to 40-80 °C during soaking. Preferably, after the rust is removed, a protective film is formed on the surface layer, and the component is taken out and immersed in a phosphoric acid solution having a concentration of 0.5 to 2% for about one hour, and finally taken out and dried.

The use of chemical rust removal operations is slightly inappropriate, but can damage parts, especially precision parts. Therefore, it is not advisable to use the chemical descaling method for derusting. Instead, the mechanical descaling method should be used. The rust layer on the parts should be removed by shovel, picking, scraping, etc., then sanded and polished with sandpaper, and finally coated. The protective layer.

For parts made of non-ferrous metals and their alloy materials, the descaling method can be carried out by referring to the descaling method of steel parts. However, two points should be noted. First, when chemical rust is used, different chemical preparations should be prepared and used according to the chemical characteristics of the component materials. Second, the corrosion of non-ferrous metals and their alloy components is removed, and mechanical removal is generally used. The rust method is suitable.

2. Removal Of Dust

There are many ways to remove dust, depending on the condition of the dust-attached surface and the degree of dust adhesion. In the dry air, if there is less dust or the dust has not been tidal, it can be wiped with a dry cloth, a towel brush, a soft brush, etc. to remove dust from the general instrument. The dust inside the instrument can be blown and dusted by the ear-washing air pump, and the vacuum cleaner can also be used for vacuuming. The dust in the diagonal and the seam can be combined to remove dust. However, for valuable precision instruments, such as optical instruments, instrument heads, etc., dust removal by the above method will also damage the instrument. In this case, special dust removal tools should be used to remove dust, such as lens paper wipes, cotton balls with alcohol, etc.