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<p>Corrosion of aluminum radiators in high-voltage direct current (HVDC) converter valves induces scaling on grading electrodes. To address this, radiator surfaces were treated with electroless Ni-P plating baths incorporating various additive systems. Systematic corrosion resistance testing, combined with phase composition and microstructural characterization of the Ni-P coatings, confirmed their significant enhancement of the aluminum alloy’s corrosion resistance in simulated internal cooling water. Cyclic flushing simulation tests further revealed that grading electrode scaling primarily originates from radiator corrosion, with preferential accumulation occurring at the current outflow region. Radiators subjected to electroless Ni-P treatment exhibited substantially reduced corrosion rates under identical applied voltage conditions. Consequently, the scaling rate on grading electrodes decreased by 95.5%. These results demonstrate that applying electroless Ni-P coatings to aluminum alloy radiators in converter valves effectively mitigates both radiator corrosion and associated grading electrode scaling.</p>

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Inhibitory Effect of Electroless Ni-P Plating of Aluminum Radiator on Scaling on Grading Electrode in High-Voltage Direct Current Converter

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Bowen Guan,
  • Wenbo Liu,
  • Dike Chen,
  • Jun Li,
  • Yuewei Wu,
  • Lei Liu

摘要

Corrosion of aluminum radiators in high-voltage direct current (HVDC) converter valves induces scaling on grading electrodes. To address this, radiator surfaces were treated with electroless Ni-P plating baths incorporating various additive systems. Systematic corrosion resistance testing, combined with phase composition and microstructural characterization of the Ni-P coatings, confirmed their significant enhancement of the aluminum alloy’s corrosion resistance in simulated internal cooling water. Cyclic flushing simulation tests further revealed that grading electrode scaling primarily originates from radiator corrosion, with preferential accumulation occurring at the current outflow region. Radiators subjected to electroless Ni-P treatment exhibited substantially reduced corrosion rates under identical applied voltage conditions. Consequently, the scaling rate on grading electrodes decreased by 95.5%. These results demonstrate that applying electroless Ni-P coatings to aluminum alloy radiators in converter valves effectively mitigates both radiator corrosion and associated grading electrode scaling.