Product Review: Kleanstrip Phosphoric Prep and Etch


Phosphoric Acid Metal Cleaner

There is a plethora of metal cleaning products available in industry as well as to the average consumer.  Many metal projects involving welding,brazing, and painting demand a metal surface free of oxidation and general contamination.  Degreasers remove lubricating oils and grease but not rust and tarnish.  Most rust removers are acid based cleaners or chelating agents.  Acid solutions are corrosive and toxic but they act rapidly on rust and tarnish.    Muriatic acid, available at many home improvement centers, is the most active but leaves metals in an activated state that makes them rust even faster and more extensively.  The acid in the featured product is a 25 to 40% phosphoric acid solution. Phosphoric dissolves rust a little slower but leaves the metal with a rust resistant finish with iron phosphate that is ideal for priming and painting. image

Steel Soaking in Phosphoric Acid

In the photo above, is 18 gauge cold rolled with surface rust soaking in the prep and etch.  Aside from the phosphoric acid, this cleaner has a surfactant to aid in wetting.


The Next Morning

After leaving the steel in the phosphoric acid overnight, this is what I found.  The metal had a more consistent finish and was overall grey.  This is iron phosphate.  This would be ideal for priming and painting.  For welding, I would wire brush this to make sure no phosphorus vapors or formed.  Also, phosphorus in element form, may make steel excessively brittle.


2 thoughts on “Product Review: Kleanstrip Phosphoric Prep and Etch

  1. Denis Lafontaine says:

    Would like to know where i can find kleen strip prep&etch phosphorus acid for rust cleaning in the city of Montreal Quebec

    • Never been to Montreal but first Check Home Depot or Ave hardware. If those options are not available consult with a paint supplier or even a welding supplies company. You can also go to Koran Strip website and find nearby distributors you can call. You could find it that way or somebody local can special order it for you.

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