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Heat Treatment Quenching Oil Brightener Applications

Metal heat-treatment quenching oil · Dual brightening + corrosion protection · BXH-403 imidazoline oleate

Surface Quality Issues in Heat Treatment Quenching

  • ⚠️ Dark, dull workpieces: quenching oil oxidation products, sludge and carbon residue deposit on the workpiece surface, reducing gloss
  • ⚠️ Oil aging: repeated high-temperature operation oxidizes and degrades the quenching oil, raising acid value and shifting cooling performance
  • ⚠️ Rusting after quenching: the highly active metal surface after quenching and cleaning rusts very easily between process steps

BXH-403 Quenching Oil Brightener (Imidazoline Oleate)

BXH-403 is an imidazoline oleate surfactant added to quenching oil (heat treatment oil) as a brightener, improving surface finish on quenched workpieces while also providing corrosion/rust protection, referencing the SH0564-1993 heat treatment oil standard.

ItemSpecification
AppearanceBrownish-red to blackish-brown liquid
Active content≥98%
Density (20℃), g/cm³0.90-0.98
Acid value, mgKOH/g≤0.5
Base value, mgKOH/g70-80

Suitable for quenching oil used in heat treatment of ferrous and non-ferrous metals, as a metal rust-preventive oil additive, and in other applications requiring imidazoline salt surfactants. Instructions for use, MSDS, and third-party test reports are provided.

FAQ

Q: How does a quenching oil brightener work?
The brightener is a surface-active component added to quenching oil: it provides detergent-dispersant action, reducing deposition of sludge and carbon residue from oil aging onto the workpiece surface; the imidazoline polar group also adsorbs onto the metal surface to form a film, adding corrosion/rust protection. Together these give quenched parts a brighter, cleaner surface after draining.
Q: What causes quenched parts to turn dark or black?
Common causes include long-term oxidative aging of the quenching oil, depletion of the brightener, excessive oil temperature control, or water contamination in the oil. We recommend testing the oil's acid value and water content, topping up the brightener (e.g. BXH-403) and observing improvement; if the oil has aged significantly, a partial or full oil change is needed.
Q: How much quenching oil brightener should be added?
The dosage depends on the base oil type, quenching process (bright quenching vs. conventional quenching), and the current oil condition, and varies considerably by formulation. We recommend a stepped bench test: start at a low ratio and increase gradually, judging the appropriate dosage by workpiece brightness on draining and oil performance (no noticeable deterioration in viscosity or flash point).
Q: How should in-process rust protection be done after quenching?
Quenched and cleaned workpieces can be dip-coated with rust-preventive oil for in-process protection; a formulation blended with BXH-102 oil-soluble imidazoline (0.3-1%) is recommended. For long-term storage protection, a more complete formulation should be designed to meet the required protection period.

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