Salt Bath Descaling

{
  "id": "MLC-T-ENV-024673",
  "term": "Salt Bath Descaling",
  "field": "Environment",
  "definition": "Removing surface oxides or scale from a part by immersing the part in a molten salt bath or hot salt solution. Salt bath descaling solutions can contain molten salts, caustic soda, sodium hydride, and chemical additives. Molten salt baths are used in a salt bath-water quench-acid dip sequence to remove oxides from stainless steel and other corrosion-resistant alloys. In this process, the part typically is immersed in the molten salt, quenched with water, and then dipped in acid. Oxidizing, reducing, or electrolytic salt baths can be used depending on the oxide to be removed. Wastewater generated during salt bath descaling includes spent process solutions, quenches, and rinses.",
  "references": [
    "40 CFR 438 Appendix C (CFR 2013)"
  ],
  "url": "https://mlchart.com/terminology/environment/salt-bath-descaling/"
}