Cm352 Corrosion Inhibitor _top_ 〈PLUS〉

| Component Category | Examples | Function | |-------------------|----------|----------| | | Quaternary ammonium salt (e.g., benzalkonium chloride derivative) | Primary adsorption, cathodic/anodic blocking | | Synergist | Potassium iodide or sodium gluconate | Enhances film stability, reduces pitting | | Solvent | Isopropanol / water blend | Solubility, low freezing point | | pH stabilizer | Triethanolamine | Maintains pH 6–8 in concentrate |

A: A food-grade variant (CM352-FG) is available that uses NSF H1-registered components. Standard CM352 is not rated for incidental food contact. cm352 corrosion inhibitor

Because CM352 is non-conductive and safe for sensitive surfaces, it is applied to printed circuit boards (PCBs), terminal strips, and relay contacts in humid environments. It prevents "fretting corrosion" caused by vibration. | Component Category | Examples | Function |

| Inhibitor | Efficiency (in 15% HCl, 60°C, 200 ppm) | Toxicity | Cost Index | Application Limits | |-----------|------------------------------------------|----------|------------|--------------------| | | 94% | Low (EC50 > 100 mg/L) | 2 | Up to 120°C | | Propargyl alcohol | 96% | High (carcinogen) | 1.5 | < 70°C, toxic fumes | | Imidazoline derivative | 91% | Moderate | 3 | Emulsification risk | | Chromate (Cr⁶⁺) | 98% | Very high (banned) | 1 | Banned in EU, USA | | Phosphate/Zn²⁺ | 75% | Low | 1.5 | Only in neutral pH | It prevents "fretting corrosion" caused by vibration

(Note: Values may vary slightly by specific manufacturer formulation)

The film should be thin and transparent. Over-application leads to pooling and longer dry times without improving protection. A typical film thickness is 2 to 5 microns.