Dinonylnaphthalene Sulfonic Acid (DNNSA) Rust Inhibitor

Name: Dinonylnaphthalene Sulfonic Acid (DNNSA) Rust Inhibitor
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 57855-77-3

Dinonylnaphthalene sulfonic acid (DNNSA) and its calcium and barium salts are highly effective corrosion and rust inhibitors widely used in engine oils, gear oils, hydraulic fluids, and protective oils. The bulky naphthalene sulfonate structure forms a tenacious adsorbed film on metal surfaces that displaces water and inhibits both ferrous and non-ferrous corrosion. DNNSA is particularly valued in rust preventive oils and long-term storage lubricants where superior water-displacement is critical.

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Technical Specifications

appearance	Dark amber to brown liquid
water content	<0.1 wt%
flash point (COC)	>175 °C
sulfonate content (active)	50–70 wt%
kinematic viscosity (100°C)	20–80 mm²/s
total acid number (for free acid form)	80–120 mg KOH/g

Applications

Corrosion preventive and rust preventive oils for metal parts storage
Engine and gear oil rust inhibitor packages (ASTM D665 compliance)
Hydraulic fluid corrosion inhibition for ferrous and non-ferrous metals
Industrial cutting and machining fluids for cast iron and steel protection
Automotive underbody and cavity wax corrosion protection coatings

Key Features

Excellent water-displacement capability forms a tenacious protective film even under wet conditions
Effective against both ferrous rusting and non-ferrous metal (copper, aluminum) corrosion
Available as free acid (DNNSA) and as calcium or barium salt for different application requirements
Compatible with a wide range of mineral and synthetic base oils for flexible formulation