Cm352 Corrosion Inhibitor | //top\\

CM352 is a specific corrosion inhibitor primarily used in the maintenance and assembly of Hartzell Propellers. It is classified as a "consumable material" in Hartzell technical documentation.  Key Uses & Application 

Purpose: It is applied to prevent corrosion on steel components, specifically bolt-on steel counterweights on propellers.

Maintenance: Hartzell recommends periodic re-application of CM352 at regularly scheduled intervals, typically aligning with the lubrication schedule found in the Hartzell Propeller Owner's Manual.

Repair Procedures: If corrosion is found during inspections (such as on staking pins or mounting bolt recesses), the area is cleaned with a solvent (like CM23) and then treated with CM352 or an equivalent inhibitor.  Technical Context 

Standard Practices: CM352 is detailed in the Hartzell Propeller Standard Practices Manual 202A (61-01-02).

Manufacturer: It is a locally procured consumable material used by Hartzell Propeller Inc. and its authorized service centers. 

For specific application instructions or to check if your propeller model requires this treatment, you can refer to the Hartzell Service Documents library. 

Are you performing a scheduled inspection or a specific repair on a Hartzell propeller assembly?  HC-SL-61-364 - SERVICE LETTER

2.1 Chemical Classification

CM352 is typically classified as an organic filming amine inhibitor. It is often formulated with a blend of:

• Fatty Amines/Amides: Provides the hydrophobic film-forming base.
• Imidazolines: Commonly used for broad-spectrum protection in oilfield environments.
• Solvents: Usually a mixture of aromatic or aliphatic solvents (and occasionally glycols for low-temperature stability) to ensure pumpability.

Q: What is the shelf life?

A: 5 years in unopened, original container stored between 5°C and 35°C.

5. Metalworking and Fabrication

Fabricators use CM352 as an "in-process" inhibitor. After machining or grinding a part, they spray it on to prevent rust before the part moves to final assembly or shipping. Unlike oils, it does not require a full degreasing before welding, as it burns off cleanly.

Key Chemical Properties

• Base Type: Blend of aliphatic hydrocarbons and proprietary organic inhibitors.
• Film Characteristic: Transparent, non-tacky, wax-free (prevents residue buildup).
• Dielectric Strength: Non-conductive, making it safe for electrical components.
• Temperature Range: Stable from -50°C to +120°C.

3. Mechanism of Action

CM352 is a mixed-type inhibitor (affects both anodic and cathodic reactions). Its mode of operation involves: