The difference between titanium filter element and stainless steel filter element
Titanium powder filter element and stainless steel powder filter element have many similar characteristics, but they also have many different characteristics in use and selection. The main differences are as follows:
1. The range of temperature resistance is different: the temperature resistance of titanium powder filter element is generally 280 ℃, and the temperature resistance of stainless steel powder filter element can reach 500 ℃.
2. There are differences in corrosion resistance: titanium powder filter elements are resistant to oxidation, alkali, and not resistant to reducing acids. The stainless steel powder filter element is alkali resistant and resistant to certain acids. For example, the stainless steel powder filter element can be used in nitric acid, sulfuric acid, acetic acid, oxalic acid, phosphoric acid, 5% hydrochloric acid, liquid hydrogen, liquid nitrogen, hydrogen sulfide, acetylene, water vapor, hydrogen, carbon dioxide and other environments stable use.
3. The manufacturing temperature of the two filter elements is different: the sintered titanium powder filter element requires a lower temperature than the stainless steel powder sintered filter element, which can also meet the corrosion resistance and pressure requirements, but the titanium powder filter element is more suitable for occasions that do not require high temperature resistance. Production and processing, easy mass production, and low energy consumption compared with stainless steel filter elements.
Pure titanium has high corrosion resistance in most media, especially in neutral, oxidizing media and sea water. The corrosion resistance of titanium in seawater is higher than that of aluminum alloy, stainless steel and nickel alloy. In the atmosphere of industrial, agricultural and marine environments, the surface will not change color after several years. It also has high corrosion resistance in alkaline solutions and most organic acids and inorganic salt solutions. ,
Pure titanium is highly corroded in hydrofluoric acid, sulfuric acid, hydrochloric acid, orthophosphoric acid and some hot concentrated organic acids, among which hydrofluoric acid has a high corrosion effect on titanium regardless of its concentration and temperature. Titanium has high stability to various concentrations of nitric acid and chromic acid.
The corrosion resistance table below is based on industrial pure titanium (dense parts) as the experimental object. The corrosion resistance of the titanium filter element is similar to that of industrial pure titanium (dense parts), but because the titanium filter element is a porous filter element with a large surface area, the corrosion rate is slightly faster than that of the dense parts.
The corrosion resistance grade is divided into three grades: Excellent—corrosion resistance, the corrosion rate is below 0.127mm/a. Good—medium corrosion resistance, the corrosion rate is between 0.127-1.27mm/a. Poor - no corrosion resistance, the corrosion rate is above 1.27mm/a.
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