Equipment used in or around mining operations — pumps, shafts, fittings, structural components — operates in wet, chemically aggressive, and abrasive environments. When it comes in for service, it comes back with heavy corrosion.
The challenge for maintenance workshops is not just removing rust. It is removing rust from complex surfaces — threaded fittings, shaft housings, bolt clusters — where a grinder cannot reach, and doing it fast enough to maintain throughput.
Where mechanical removal falls short
An angle grinder handles flat and accessible surfaces. It does not handle internal bores, thread roots, recessed bolt heads, or the inside of pump housings. Those surfaces require either manual wire brushing — slow — or a chemical treatment that reaches where tools cannot.
In high-rust applications, mechanical removal also consumes grinding discs rapidly. On heavily corroded steel, a disc that would last a day on clean metal work wears out far faster.
Chemical treatment in high-rust applications
Phosphoric acid-based rust removers dissolve iron oxide on contact regardless of surface geometry. A pump shaft, bolt cluster, or internal housing can be treated by immersion or by application with a brush. The chemistry works on the rust wherever it is present — visible surfaces and recesses equally.
A pump shaft treated by RNE Pumps using Corrosion Assassin had rust removed rapidly, saving significant manual preparation time.
Corrosion Assassin removed rust almost instantly, saving us hours of work.Zack Herridge · RNE Pumps
The surface left after treatment
After treatment and rinsing, the surface carries an iron phosphate layer. For pump components and mechanical parts that will be machined, fitted, or coated, this surface is clean and dimensionally stable. The phosphate layer does not add measurable thickness to the part.
Practical application in a workshop setting
For high-volume rust removal on components — bolt batches, fittings, small parts — a soak bath is the most efficient approach. Parts are submerged, left for the required dwell time, rinsed, and dried. Processing volume increases significantly compared to one-piece mechanical removal.
Corrosion Assassin is available in 25L and 1000L IBC for workshop and industrial volume applications.
Keep reading: which equipment metals it is safe on, or see the Corrosion Assassin rust remover.
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