Corrosion control in mining refers to the systematic application of engineering strategies, material selection practices, and chemical treatments designed to prevent, slow, or manage the degradation of metals and structures caused by chemical reactions between metals and their environment. In bauxite, gold, iron ore, and diamond mining operations, corrosion is a pervasive and costly problem that affects pipelines, tanks, pressure vessels, structural steelwork, conveyor components, pumping systems, processing equipment, and underground support structures. The consequences of uncontrolled corrosion in mining include equipment failure, unplanned production shutdowns, safety incidents (such as structural collapse or piping leaks), increased maintenance and replacement costs, and environmental contamination from leaks of process chemicals or mine water. Corrosion in mining environments is driven by a combination of factors: moisture, dissolved salts (particularly chlorides and sulphates), acidic conditions (especially in acid mine drainage environments), microbiologically influenced corrosion (MIC), high temperatures, and abrasion that removes protective oxide layers. Effective corrosion control strategies include: protective coatings (epoxy linings, polyurethane coatings, and thermal spray coatings applied to pipe interiors and structural surfaces); cathodic protection (impressed current or sacrificial anode systems applied to buried pipelines and tanks); material selection (use of stainless steel, duplex alloys, HDPE, or fibre-reinforced polymer (FRP) in highly corrosive environments); chemical inhibition (addition of corrosion inhibitors to water circuits and process fluids); and design measures (minimising crevices, dead legs, and areas where stagnant water accumulates). In gold heap leach operations, the acidic leach solution is highly corrosive to carbon steel, requiring extensive use of HDPE-lined ponds and acid-resistant coatings. In iron ore mining, the combination of seawater at port facilities and slurry pipelines creates aggressive corrosion conditions. In bauxite refining, the caustic Bayer process liquor is extremely corrosive to many common metals, requiring careful selection of materials for digesters and pipework.
