Sulfuric acid is one of the most commonly used and highly corrosive industrial chemicals. Its impact on materials varies significantly depending on concentration and temperature. For concentrated sulfuric acid (over 80% concentration) at temperatures below 80°C, carbon steel and cast iron exhibit good corrosion resistance. However, they are not suitable for high-speed flow or as materials for pumps and valves. Common stainless steels like 304 (0Cr18Ni9) and 316 (0Cr18Ni12Mo2Ti) also have limited use in such environments. High-silicon cast iron and high-alloy stainless steels, such as No. 20 alloy, are typically used for sulfuric acid pumps and valves, but these materials are difficult to process and expensive. As a more economical alternative, fluoroplastic alloys—patented by the Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences—show excellent resistance to sulfuric acid. Our company introduced this technology in 1985 and has since developed corrosion-resistant chemical pumps. According to experiments conducted by the Chinese Academy of Sciences, fluoroplastics do not react with any chemical medium, making them an ideal choice. Our product range includes IHF fluoroplastic chemical pumps, FSB fluoroplastic centrifugal pumps, IGF fluorine-lined pipeline pumps, PF-type corrosion-resistant centrifugal pumps, and CQB-F fluoroplastic magnetic pumps. For the latest orders and buyer information, feel free to contact us.
Hydrochloric acid is another common corrosive medium. Most metals, including various stainless steels, are susceptible to its attack. Molybdenum-containing ferrosilicon can only be used in hydrochloric acid solutions below 30% at temperatures under 50°C. In contrast, non-metallic materials generally show better resistance. Therefore, lined rubber or plastic pumps—such as those made from engineering plastics or fluoroplastics—are the best options for transporting hydrochloric acid. Our fluoroplastic chemical pump series is specifically designed for such applications.
Nitric acid is highly corrosive to most metals. However, stainless steel-based centrifugal pumps are widely used due to their good corrosion resistance across all concentrations at room temperature. It's worth noting that molybdenum-containing stainless steels like 316 or 316L may perform worse than standard stainless steels like 304 or 321. For high-temperature nitric acid, fluoroplastic alloys are preferred. Our product line includes IHF fluoroplastic chemical pumps, FSB fluoroplastic centrifugal pumps, IGF fluorine-lined pipeline pumps, PF-type corrosion-resistant centrifugal pumps, and CQB-F fluoroplastic magnetic pumps.
Acetic acid is one of the most aggressive organic acids. Ordinary steel is easily corroded in all concentrations and temperatures. Stainless steel, especially 316 with molybdenum, is a good choice for acetic acid. For high-temperature or high-concentration conditions, high-alloy stainless steel or fluoroplastic chemical pumps such as CQB-type stainless steel magnetic pumps, CQ-type magnetic drive pumps, and stainless steel chemical pumps are recommended.
Alkaline solutions like sodium hydroxide are generally less corrosive, but they can cause crystallization. Suitable materials include silicide and graphite mechanical seals, and FSB-type fluoroplastic centrifugal pumps are often chosen for such applications.
Ammonia and ammonia hydroxide are generally less corrosive to most materials, except copper and copper alloys. Most of our pumps, including IHF fluoroplastic chemical pumps, FSB fluoroplastic centrifugal pumps, IGF fluorine-lined pipeline pumps, PF-type corrosion-resistant centrifugal pumps, CQB-F fluoroplastic magnetic pumps, and CQF-type plastic magnetic pumps, are suitable for ammonia transport.
Saltwater and seawater pose moderate corrosion risks to ordinary steel, which usually requires protective coatings. Stainless steels like 316 offer better resistance against localized corrosion caused by chloride ions. Our pumps, such as the IH stainless steel chemical pump, are commonly used in these environments.
For alcohols, ketones, esters, and ethers, the corrosion is generally mild. Most can be handled with ordinary stainless steel, though sealing materials should be carefully selected due to solubility issues with certain rubbers. Fluoroplastic magnetic pumps are recommended for inorganic sealing. There are many other media we haven’t covered here, but our extensive experience ensures proper material selection for every application.
Heavy Duty wheels,Industrial Fixed Caster,Pvc Cater Wheel,Caster Wheel
BENYU CASTERS & WHEELS CO.,LTD , https://www.benyucaster.com