1,Stainless steel water tankThe material should have sufficient strength and durability in use, such as oxidation resistance and erosion resistance when operating in warm water all year round. In addition, the metal materials should have good weldability to make the water tank easy to manufacture.

2Stainless steel is a modern nationalSolar water heaterThe materials widely used in water tanks. Stainless steel has excellent strength, plasticity, corrosion resistance and weldability. Water tanks welded with thin stainless steel plates are both light and strong, and are widely used in pressurized and non-pressurized solar water heaters.

3There are many types of stainless steel. When selecting stainless steel trademarks, one should comprehensively consider strength, plasticity, weldability, economy, especially corrosion resistance in water containing chloride ions. It is widely used in the chemical industry, food industry and kitchen equipment304Stainless steel is an austenitic stainless steel with good strength, plasticity and weldability. At present, non-pressure water tanks are mostly used in our country304Made of stainless steel.

4,304Stainless steel has strong resistance to erosion in oxidizing acid media, but it is prone to pitting erosion and stress erosion in water containing chloride ions. The chromium content in steel12%At that time, because the highly oxidizing chromium rapidly forms a dense and stable oxygen-rich passivation film with oxygen on the surface of the steel(Cr2O3)It effectively isolated the further invasion of oxygen. Therefore, in the air or with oxidizing acids(Such as nitric acid)This type of steel has good resistance to average erosion and does not rust, so it is called stainless steel. But in water, especially in the mouthCl-In water with a higher concentration, becauseCl-Ions can pair in certain partsCr2O3The passivation film has a destructive effect, leading to partial erosion. And average erosion(Chemical erosion)In comparison, partial erosion(Electrochemical erosion)The speed is much faster, but the risk is also much greater, often leading to missed results.

5And in the contentCl-Among the water medium, the weakest part of stainless steel that is prone to corrosion is the welding zone. This is because this area has been exposed to high-temperature heating, resulting in deterioration of its structure and properties, as well as a reduction in its corrosion resistance. Therefore, the service life of the water tank mainly depends on the thin parts of the water tank(Welding area)Can grain boundary erosion, stress erosion and points occur(Crack)Erosion is a type of partial erosion. Experimental research indicates that when water containsCl-Cracks occur when the concentration of ions is relatively high(point)Erosion is a common form of erosion that occurs in water tanks.