Ultrasonic cleaners are widely used in industrial and precision cleaning due to their ability to remove contaminants from complex surfaces. However, users often encounter rust formation on processed metal parts, especially at the bottom. This article explores the root causes and effective solutions.
Cheaper ultrasonic cleaners may use low-grade stainless steel (e.g., 201 series) for components like tanks or baskets. These materials lack sufficient chromium and nickel content, making them prone to oxidation when exposed to moisture or acidic solutions.
Poor welding techniques during manufacturing can alter the microstructure of stainless steel, creating vulnerable zones where rust initiates.
Aggressive cleaning agents containing acids or alkalis may leave corrosive residues if not thoroughly rinsed. These residues accelerate electrochemical reactions between moisture, oxygen, and metal surfaces.
Complex geometries (e.g., threaded holes or welded joints) in workpieces tend to retain liquid, forming localized corrosive environments.
Insufficient immersion depth exposes parts to air during the cavitation process, creating oxygen-rich conditions ideal for oxidation.
Excessive temperatures (>60°C) in heated ultrasonic systems can destabilize protective oxide layers on metals.
High ambient humidity or airborne pollutants (e.g., sulfur compounds) interact with residual moisture on cleaned parts, triggering chemical corrosion.
Rust in ultrasonic cleaning systems stems from material compromises, chemical residues, and environmental interactions. By adopting corrosion-resistant materials, optimizing cleaning parameters, and implementing strict drying protocols, manufacturers can significantly reduce oxidation risks. Regular equipment maintenance further ensures long-term performance and workpiece integrity.
