FYX High-purity Aluminum Submerged Pump

Material Selection for Concentrated Nitric Acid Submerged Pumps
1. High-purity Aluminum
Among these materials, high-purity aluminum delivers excellent corrosion resistance to concentrated nitric acid at room temperature.Its disadvantage is that it suffers severe corrosion in concentrated nitric acid when the temperature exceeds 60℃.Therefore, high-purity aluminum submerged pumps are only applicable for nitric acid transportation with operating temperatures below 60℃.
2. High-silicon Iron
High-silicon iron features outstanding corrosion resistance to concentrated nitric acid under all temperature conditions.However, it is brittle with poor mechanical properties, which greatly limits its application in concentrated nitric acid delivery.
3. PTFE
PTFE is resistant to nitric acid corrosion at temperatures below 120℃.Nevertheless, its inherent drawbacks such as soft texture and easy aging restrict the wide use of PTFE pumps in nitric acid equipment.At present, PTFE is mainly used for mechanical seals and gaskets, while pump bodies are generally made of other materials.
4. Special High-silicon Stainless Steel
This material boasts the best comprehensive corrosion resistance to concentrated nitric acid among all options.Its anti-corrosion performance is superior to high-purity aluminum and close to high-silicon iron.Meanwhile, its mechanical strength and machinability are far better than both high-purity aluminum and high-silicon iron.
Although the material cost is relatively high with a higher one-time investment,it provides excellent corrosion resistance and long service life.With reliable mechanical properties, it ensures a high safety factor and convenient maintenance during operation.It effectively reduces unplanned shutdowns or achieves non-stop production, greatly improving the overall production efficiency of the production line.
5. 304L Stainless Steel
It is a common misconception that 316 stainless steel is always more corrosion-resistant than 304.This view is not objective.In nitric acid environments, 304L has better corrosion resistance than 316L.Molybdenum contained in 316L will reduce the anti-corrosion performance of stainless steel in nitric acid.
In boiling 65% nitric acid,the corrosion rate of 304L is 0.15 mm/year, while that of 316L exceeds 0.3 mm/year.304L is fully applicable to nitric acid with a concentration below 68%, covering operating conditions from normal temperature to boiling point.

Recommendation of Nitric Acid Submerged Pumps
1.Cost-effective Pump: FYX High-purity Aluminum Submerged Pump for Concentrated Nitric AcidIn the transportation of concentrated nitric acid, most users choose our FYX high-purity aluminum submerged pump. It features low cost with a regular service life of 1 to 2 years. We also provide timely and thoughtful after-sales service, making it the preferred choice for most customers.
2.Cost-effective & Long-term Value Pump: FYX-X Special High-silicon Stainless Steel Nitric Acid Submerged PumpAs mentioned above, special high-silicon stainless steel delivers excellent mechanical properties, outstanding nitric acid corrosion resistance and a long service life. It can withstand a working temperature up to 100°C and is suitable for nitric acid of any concentration.Disadvantage of this pump: extremely high price.For this reason, few customers select this material at present. Custom advance ordering is required if needed.
3.Low-price Nitric Acid Submerged Pump: FYX-L 304L Nitric Acid Submerged PumpThe 304L nitric acid submerged pump is applicable to nitric acid with a concentration not exceeding 68%. It perfectly complements the FYX high-purity aluminum pump, and it is the most cost-effective and lowest-priced model among the three types.