What are the defects of the enamel water tank?
In the production of water heaters in China, the use of enamel water tanks is increasing. Due to its superior performance in anti-corrosion, the enamel liner is replacing the other liners and becoming the main force of the water heater liner. So what are the defects of the enamel water tank?
First of all, the enamel liner is catastrophic for the enamel water tank with high carbon steel as the inner liner due to the weld scale on the weld joint, which leads to the vain of the porcelain powder and the loose and easy to fall off of the porcelain powder. At this time, chloride ions and calcification in water are likely to cause chemical corrosion of carbon steel, and the exposed side of the carbon steel weld is likely to cause ionization corrosion. At this time, the water quality in the water tank and the life of the water tank itself are seriously affected. . In particular, the "V" type of the weld of the water tank (see the figure below) is more likely to cause the enamel to fall off.
Secondly, since the porcelain powder is a material with poor thermal conductivity, and the enamel of the inner tank of the pressurized water tank, it is easy to generate thermal resistance on the water tank coil, which is equivalent to wasting the heat transferred from the boiler, the boiler and the solar energy.
Thirdly, since the enamel adhered to the inner tank of the enamel tank is a rigid coating, the thermal expansion and contraction of the tank liner (whether enamel or stainless steel) due to the internal water temperature is likely to cause cracks in the enamel coating. The effect on the tank liner and water is the same as that of the enamel.
In addition, because the inner coil of the water tank is in heat exchange, the water flow speed inside the coil is very fast, and the coil (regardless of the enamel water tank or the stainless steel water tank) is spiral, and the rapid high temperature water flow rate will inevitably lead to the coil. Trembling, at this time, the welding part of the coil and the tank liner (regardless of whether the scale is removed) will sway, and the enamel layer which is not strong in this part is more likely to cause cracks and falls off of the porcelain powder. Of course, in the case of enamel technology is very good (usually a plane with a relatively flat or curved surface), the corrosion resistance is very good. However, the above-mentioned enamel water tank has its inherent weakness in pressure, weld seam and anti-corrosion, which will gradually be eliminated by the anti-corrosion treatment of stainless steel water tank.