Selection of Electrode and Lining for Electromagnetic Flow Meter Xi'an Intelligent Electromagnetic Flow Meter
Selection of electrodes for acid-base liquid flowmeter
1. Electrode Material: Stainless Steel 0Crl8Nil2M02Ti
Corrosion resistance and wear resistance: Used for weakly corrosive media such as industrial water, domestic water, sewage, etc., suitable for industrial sectors such as petroleum, chemical, steel, municipal, * * * and other fields.
2. Electrode material: Hastelloy B
Corrosion resistance and wear resistance: It has good corrosion resistance to all concentrations of hydrochloric acid below boiling point, as well as to non chlorinated acids, bases, and non oxidizing salt solutions such as sulfuric acid, phosphoric acid, hydrofluoric acid, and organic acids.
3. Electrode material: Hastelloy C
Corrosion resistance and wear resistance: able to resist corrosion from non oxidizing acids such as nitric acid, mixed acids, or mixed media of chromic acid and sulfuric acid, as well as corrosion from oxidizing salts such as Fe, Cu, or other oxidants such as hypochlorite solutions above room temperature and seawater
4. Electrode Material: Titanium
Corrosion resistance and wear resistance: able to withstand corrosion from seawater, various chlorides and hypochlorites, oxidizing acids (including fuming sulfuric acid), organic acids, and alkalis. Not resistant to the corrosion of relatively pure reducing acids (such as sulfuric acid, hydrochloric acid), but if the acid contains oxidants (such as nitric acid, Fc++, Cu++), the corrosion is greatly reduced.
5. Electrode Material: Tantalum
Corrosion resistance and wear resistance: It has excellent corrosion resistance similar to glass. Except for hydrofluoric acid, fuming sulfuric acid, and alkali, it can almost withstand corrosion from cutting chemical media (including boiling point hydrochloric acid, nitric acid, and sulfuric acid below 50 ℃). Dig in alkali; Corrosion resistance.
6. Electrode Material: Platinum/Titanium Alloy
Corrosion resistance and wear resistance: almost able to withstand cutting chemical media, but not suitable for aqua regia and ammonium salts.
7. Electrode material: Stainless steel coated with tungsten carbide
Corrosion resistance and wear resistance: used for non corrosive and highly abrasive media.
Note: Due to the wide variety of media and the complex factors such as temperature, concentration, and flow rate that affect their corrosiveness, this table is for reference only. Users should make their own choices based on the actual situation, and if necessary, conduct corrosion resistance tests on the selected materials, such as hanging plate tests.
Selection of lining for electromagnetic flowmeter
1. Polytetrafluoroethylene (F4):
a、 Main performance: It is the most chemically stable plastic, capable of withstanding boiling hydrochloric acid, sulfuric acid, nitric acid, and aqua regia, as well as concentrated alkali and various organic solvents. Not resistant to corrosion from chlorine trifluoride, high-temperature chlorine trifluoride, high flow rate liquid fluorine, liquid oxygen, and auto oxygen.
b、 Maximum medium temperature:
- Body type: 70 ℃
Separate type: 100 ℃ 150 ℃ (special order required)
c、 Scope of application: Strong corrosive media such as concentrated acid and alkali, and sanitary media.
2. Perfluoroethylene propylene (F46):
a、 Main performance: Same as F4, with higher wear resistance and negative pressure resistance than F4.
b、 Maximum medium temperature:
- Body type: 70 ℃
Separate type: 100 ℃ 150 ℃ (special order required)
c、 Scope of application: Strong corrosive media such as concentrated acid and alkali, and sanitary media.
3. Polyfluoroethylene (Fs):
a、 Main performance: The applicable temperature upper limit is lower than that of polytetrafluoroethylene, but the cost is also lower.
b、 Maximum medium temperature:
- Body type: 70 ℃
Separate type: 80 ℃
c、 Scope of application: Strong corrosive media such as concentrated acid and alkali, and sanitary media.
4. Polychloroprene rubber:
a、 Main performance: Excellent elasticity, high tensile strength, and good wear resistance. Resistant to corrosion in general low concentration acid, alkali, and salt media, but not resistant to corrosion in oxidizing media.
b、 Maximum medium temperature:
- Body type: 70 ℃
Separate type: 80 ℃ 120 ℃ (special order required)
c、 Scope of application: Water, sewage, and weakly abrasive slurry.
5. Polyurethane rubber:
a、 Main performance: Extremely strong wear resistance. Poor corrosion resistance.
b、 Maximum medium temperature:
- Body type: 70 ℃
Separate type: 80 ℃
c、 Scope of application: Neutral strong abrasion slurry, coal slurry, and mud.
Selection of Electrode and Lining for Electromagnetic Flow Meter Xi'an Intelligent Electromagnetic Flow Meter