Cm352 Corrosion Inhibitor |top| -
After passivation, reduce feed to maintain a residual concentration of of active CM352. Use a simple test kit (typically a colorimetric drop test for the proprietary amine) to verify levels twice per week.
| Feature | CM352 | Sodium Nitrite | Molybdate | Phosphates | | :--- | :--- | :--- | :--- | :--- | | | Multi-metal (Steel, Cu, Al, Brass) | Steel only | Steel & Al | Steel & Zn | | Environmental Toxicity | Low (Biodegradable) | Moderate (Nitrosamine risk) | Low (Molybdenum limits) | High (Eutrophication) | | Temperature Limit | Up to 180°C | < 80°C | < 95°C | < 90°C | | Microbial Support | No nutrient value | Potential nitrifier food | None | High algal nutrient | | Critical Dosage | 500–1500 ppm | 800–2000 ppm | 2000–5000 ppm | 1000–3000 ppm |
: The bolt-on, steel counterweights attached to propeller assemblies are highly susceptible to oxidation. Hartzell Propeller Inc. applies CM352 during the factory assembly process to ensure these heavy steel components do not rust.
Adherence to safety is paramount. Hartzell's manuals are explicit about one crucial prohibition: . These components are typically made of specialized materials that could be damaged or whose function could be impaired by contact with the inhibitor. cm352 corrosion inhibitor
In the aviation industry, is a specific code for a corrosion inhibitor used in the maintenance of Hartzell propellers . It is a consumable material applied during inspections and repairs to protect critical components like: Counterweight bolts and bolt wells. Staking pins and mounting bolt recesses.
“The CM352 reacted with the iron oxides,” Elara whispered, running a gloved finger over the metal. “It turned active, expanding rust into a stable, protective layer. The corrosion hasn’t just stopped. The steel is armored now.”
CM352 is a protective coating applied to prevent oxidation on bolt-on steel counterweights After passivation, reduce feed to maintain a residual
During mandated Alert Service Bulletins (such as HC-ASB-61-376), technicians look closely for early signs of oxidation on vital surfaces, including: Staking pins and staking pin holes Side walls of mounting bolt recesses External counterweight profiles
For a new or cleaned system, use a "shock dose" of 2000–2500 ppm of CM352. Circulate this concentration for 24–48 hours. This step allows the film to fully develop on all bare metal surfaces.
The rebar inside wasn't orange with flaky rust. It was a smooth, dark patina. . Hartzell Propeller Inc
Recommended applications and dosing
: It is specifically applied to bolt-on steel counterweights, bolt heads, spring pins, and bolt wells Hartzell Propeller Protection Type
Spray or pour a controlled volume of the fluid into a clean, dry cup or secondary containment vessel. Step 3: Targeted Brush Application