Sodium Molybdate Storage — Na2MoO4 Anodic Corrosion Inhibitor + HVAC Tank Selection

Storing Sodium Molybdate? Start Here

Sodium molybdate is a versatile chemical used primarily as a corrosion inhibitor in HVAC systems and antifreeze formulations. It comes in various forms, including anhydrous powder, dihydrate crystals, and aqueous solutions. Known for replacing the more hazardous hexavalent chromate, sodium molybdate is favored for its effective protection of metals like steel, copper, and aluminum without the severe health risks. Its applications extend beyond HVAC systems to include crop micronutrient supplementation and other industrial uses.

Can you store it in a poly tank?

Yes, sodium molybdate can be safely stored in polyethylene tanks. Both high-density polyethylene (HDPE) and cross-linked polyethylene (XLPE) are suitable for storing this chemical, whether it's in solid form or as a solution. These materials are standard for non-aggressive water-soluble salts like sodium molybdate.

Key Issue: Metal Passivation

Sodium molybdate's primary function is to passivate metal surfaces, particularly in HVAC systems. While this is beneficial in service, it’s important to ensure that storage tanks and handling systems are made of compatible materials to prevent unintended reactions. Poly tanks are ideal as they do not react with the chemical.

The safety that actually matters

• Use proper personal protective equipment (PPE) to avoid skin and eye irritation.
• Ensure adequate ventilation to prevent respiratory irritation.
• Store in compatible tanks to prevent chemical reactions.

Common questions

Is sodium molybdate toxic?

It is not highly toxic at typical handling levels but can cause irritation, so handle with care.

What gasket material should I use?

EPDM gaskets are standard for sodium molybdate storage, but always match gaskets to the manufacturer chart.

Can it be used in food-processing applications?

Yes, but ensure components meet NSF 60 and NSF 372 standards for potable water systems.