Solution

1. Pumps for Hydrochloric Acid Since the common concentration of hydrochloric acid can be as high as 38%, pumps for hydrochloric acid basically only require that the wetted parts are made of plastic.

 

2. Pumps for Sulfuric Acid For dilute sulfuric acid, there is a wide selection of acid-resistant pumps, such as engineering plastic pumps, ceramic pumps, F46 pumps, and F26 pumps. However, concentrated sulfuric acid can only use fluoroplastic pumps, as it corrodes ordinary engineering plastics but not fluoroplastics. In addition, note that concentrated sulfuric acid has a very high density. When selecting a pump, ensure the motor has sufficient power.

 

3. Hydrofluoric Acid Hydrofluoric acid is extremely corrosive, so fluororesin magnetic drive pumps are recommended. In addition, ceramic components in this series of pumps must be replaced with materials resistant to hydrofluoric acid.

 

4. Nitric Acid Fluoroplastic magnetic drive pumps are also recommended for nitric acid transfer. Rubber seals should be replaced with PTFE (Teflon) ones.

 

5. Acetic Acid Acetic acid is one of the most corrosive organic acids. Ordinary steel suffers severe corrosion in acetic acid. For harsh conditions such as high-temperature, high-concentration acetic acid and other corrosive media, high-alloy stainless steel and fluoroplastic magnetic drive pumps can be selected, e.g., CQB magnetic drive pumps and CQ 316L stainless steel magnetic drive pumps.

 

6. Brine Solution Ordinary steel has a low corrosion rate in sodium chloride solution, seawater, and brackish water, but generally requires coating protection. Various stainless steels also have low general corrosion rates, but may suffer localized corrosion due to chloride ions. 316 stainless steel is usually recommended, but due to its high cost, fluoroplastic centrifugal pumps such as IHF chemical centrifugal pumps are preferred.