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Valve fittings do more corrosion resistance

Mar 28, 2018

Valve accessories have better corrosion resistance. First of all, it is important to note that corrosion resistant materials must be selected based on the corrosive medium. In the actual production of valve fittings, the corrosion of the medium will be very complicated. Even if the valve material is used in the same medium, the medium concentration, temperature, and pressure are different, and the medium does not corrode the material. same.


Afterwards, when the valve parts are selected from the above materials, the corrosion rate will increase by 1 to 3 times for every 10°C increase in the temperature of the medium. The concentration of this medium has a great influence on the corrosion of valve materials. For example, if lead is present in a small concentration of sulfuric acid, the corrosion performance will be relatively small. When the concentration exceeds 96%, the corrosion increases rapidly.


However, when selecting the material for the valve fitting, if the carbon steel is selected, the corrosion is most severe when the sulfuric acid concentration is about 50%. When the concentration is increased to 6% or more, the corrosion will drastically decrease. For example, aluminum has strong corrosion performance in concentrated nitric acid with a concentration of more than 80%, but corrosion is serious in medium and low concentrations of nitric acid.


If the valve fittings are made of non-metallic materials, the non-metallic corrosion resistance is better. As long as the valve temperature and pressure are in accordance with the requirements of non-metallic materials, it can not only directly solve the corrosion problems, but also be used in practice. At the time, it can also save valuable metals. The valve fitting at this time can not only ensure the strength of the valve to a great extent, but also ensure that the valve is not corroded.


Although the corrosion resistance of stainless steel to dilute nitric acid is relatively strong, but more than 95% of concentrated nitric acid corrosion will increase. As far as our manufacturers are concerned, when selecting a material, the valve fittings will directly select the corrosion resistance on the corresponding material list to ensure that its valve fittings are better in terms of corrosion resistance.http://www.pump-casting.com/