1. Alkali (sodium hydroxide) :
Iron and steel is widely used in 80 degrees Celsius, 30% concentration of sodium hydroxide solution, there are a lot of factories at 100 degrees Celsius, 75% still choose the following usually steel, although the corrosion to add, but the economy is good. Usually stainless steel on the lye and corrosion resistance of cast iron compared no significant advantages, just medium allowed a few iron doped into don't recommend using stainless steel. A high temperature lye with titanium and titanium alloy or high alloy stainless steel.
2. Ammonia (ammonium hydroxide):
Most of the metal and non metal in liquid ammonia and ammonia (ammonium hydroxide) in the corrosion is very small, only with copper and copper alloy should not be.
3. Salt water (sea water):
Usually steel in sodium chloride solution and sea water, salt water corrosion rate is not too high, usually must use a paint protection; all kinds of stainless steel also very low corrosion rate, but perhaps due to chloride ions caused localized corrosion, usually use 316 stainless steel is better.
4. Alcohols, ketones, esters, ethers:
Common alcohols media are methanol, ethanol, ethylene glycol, alcohol and other and ketones medium with acetone, butanone, esters of medium a variety of methyl, ethyl ester, ether medium with ether, ethyl ether, butyl ether, etc., they have no corrosion, commonly used data can be applicable, with selection should also according to the characteristics of the medium and the request make rational choice. Other notable is ketone, ester, ether to a variety of rubber is dissolved, prevent to make mistakes when choosing sealing material.
