Corrosion-resistant liquified gas evaporator

An evaporator for vaporizing a liquified gas such as chlorine, said evaporator comprising:

• A. a water vessel having a heater therein to raise the temperature of the water to a degree sufficient to effect vaporization of liquified gas;
• B. a vapor tank supported within said vessel and surrounded by said heated water, said tank having a steel wall possessing high heat transfer characteristics;
• C. means to supply the liquified gas into the tank to be vaporized by heat transferred from the water through the steel wall, said steel wall having an outer surface coated by a layer of sintered tetrafluoroethylene powders that adhere to the surface, said layer having a thickness in the range of 4 to 6 mils just sufficient to render it impermeable to the water but insufficient to materially reduce the heat transfer characteristics of the steel wall, thereby inhibiting corrosion of the outer surface and the formation of scales thereon without the loss heat energy.