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1. How to choose the correct lining material for electromagnetic flowmeter
1. The selection of electrode lining material for electromagnetic flowmeter should be based on the corrosiveness of the measured fluid. Please refer to the relevant corrosion manual. For special fluids, the corrosion resistance performance of the test material should be tested. 316L is suitable for: domestic water, industrial water, raw water and well water, urban sewage.
2. Weak corrosive acid, alkali, salt solution. Hastelloy B is suitable for:
1. Hydrochloric acid (concentration less than 10%), all concentrations of ammonium hydroxide alkali solution
2. Sodium hydroxide (concentration less than 50%), all concentrations of ammonium hydroxide alkali solution
3. Phosphoric acid, organic acid not applicable: Hastelloy hydrochloride C is applicable:
1. Mixed acid solutions such as chromic acid and sulfuric acid
2. Oxidative salts such as Fe++Cu++ Not suitable for seawater: Titanium hydrochloride (Ti) is suitable for:
1. Salts, such as: (1) chlorides (chloride/magnesium/aluminum/calcium/ammonium/titanium, etc.) (2) sodium salts, potassium salts, ammonium salts, hypochlorite salts, seawater
2. Potassium hydroxide, ammonium hydroxide, barium hydroxide alkaline solutions with concentrations less than 50% are not suitable: hydrochloric acid, sulfuric acid, phosphoric acid, hydrofluoric acid, barium cyanide alkaline solutions Tantalum (Ta) is suitable for:
1. Hydrochloric acid concentration less than 40%), dilute sulfuric acid and concentrated sulfuric acid (excluding fuming sulfuric acid)
2. Chlorine dioxide, magnesium chloride, hypochlorous acid, sodium cyanide, lead acetate, etc._600x400.jpg)
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3. Oxidative acids such as nitric acid (including fuming nitric acid) are not suitable for Wangchi plum water with a temperature below 80 ℃: pre alkali trapping, platinum (Pt) hydrofluoric acid.
Applicable: Almost all acid, alkali, and salt solutions (including fuming sulfuric acid and fuming nitric acid) are not applicable: aqua regia and ammonium salt electrode materials with corrosion resistance and wear resistance. Stainless steel 0Crl8Nil2M02Ti is used for weakly corrosive media such as industrial water, domestic water, and sewage. It is suitable for industrial sectors such as petroleum, chemical, steel, as well as municipal and environmental protection fields. Hastelloy B 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. Hastelloy C can withstand 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, and other oxidants such as hypochlorite solutions above room temperature and seawater. Titanium can withstand corrosion from seawater, various chlorides, and hypochlorites, as well as oxidizing acids including fuming sulfuric acid, organic acids, and bases. Not resistant to the corrosion of relatively pure reducing acids such as sulfuric acid and hydrochloric acid, but if the acid contains oxidants such as nitric acid, Fc++, Cu++, the corrosion is greatly reduced. Tantalum has excellent corrosion resistance similar to glass. Except for hydrofluoric acid, fuming sulfuric acid, and alkali, it can w