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Circuit Board Cleaning
Published: March 1, 2021

Q. We’re looking for an aluminum safe cleaner for removing thin films of oils and proteins from a circuit board.

A. Often the safest way to clean aluminum is with an acidic detergent.  We recommend using Citranox® Liquid Acid Cleaner and Detergent as an aluminum safe cleaner to remove thin films of oils and proteins from a circuit board which has aluminum containing elements in addition to any standard circuit board components.

  1. Use a warm 2% (20 mL/L) solution of Citranox for 20 min in ultrasonics
  2. Follow with a thorough DI water rinse and high purity IPA (isopropyl alcohol) dry

If a low foaming detergent is required due to it being cleaning in a spray cabinet, or similar, we would go with Citrajet® Low-Foam Liquid Acid Cleaner/Rinse at a similar 2% concentration.

If the oil or protein, is not “thin” or otherwise minimal in its relative amount, we may require a more alkaline and/or protein enzyme containing detergent such as Liquinox® Critical Cleaning Liquid Detergent or Tergazyme® Enzyme-Active Powdered Detergent to clean aluminum circuit boards.  Recall that alkaline detergents are better for organic residues, and Tergazyme detergent is enhanced with protein enzymes.

We are happy to discuss the specifics any time!

To request this or any Alconox Inc. detergents for free, please complete the questionnaire at Get Sample. For more information about any one of our Alconox Inc. detergents, consult the technical bulletin for each product. Or click here to access each of our detergent’s Safety Data Sheets.

Do you have a critical cleaning question for the experts at Alconox, Inc.?  Search TechNotes to see if it’s been answered before or Ask Alconox.

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