Tag Archives: Flash Rust

Why is steel dull gray after Waterjetting? What does the profile look like under rust?

Posted on 31. Jul, 2017 by .

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This is a monograph on why steel looks dull  gray after waterjet cleaning.  What does the profile look like under rust? The simple answer is that abrasives leave debris behind which reflects back the light; abrasives plow the surface and create plateaus. Water jet cleaning (Hydroblasting) removes the debris and doesn’t form flat surfaces. Grey […]

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#2 Defining Rust Back, Flash Rust, and Rust Bloom

Posted on 06. Mar, 2014 by .

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Back in 2005, Ray Weaver of SSPC Staff and Lydia Frenzel of Advisory Council co-authored an article to tell the difference between flash rust, rust back, and rust bloom.  It never got published.  Frenzel is posting this on the Flash Rust web site in March 2014. Look at this article and use the three flow […]

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# 1 What is Flash Rust, Rust Back, and Rust Bloom?

Posted on 27. Feb, 2014 by .

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2014-02-27 Start of a blog. I, Lydia Frenzel, Ph.D., have been talking on this subject since 1985. John Kelly, International Paint, in May 1996 published “There’s More than One Kind of Rust” in Marine Log (Page 18).  You should read this article.  It is simple and direct. Rust Back and Flash Rust are terms that […]

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TEST PROTOCOL for CORROSION INHIBITORS OR SALT CLEANERS for FLASH RUST

Posted on 10. May, 2011 by .

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This is a Test Protocol for Corrosion Inhibitors or Cleaners for Flash Rust. Prepared by Lydia Frenzel from a specific Proprietary Inhibitor and Cleaner manufacturer’s sheet. Most of the manufacturers have letters or tests results from specific coatings manufacturers. If you contact me, I will send you the link to the source material. OBJECTIVE: This […]

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Pressure Sensitive Tape Test for Quantity of Flash Rust

Posted on 16. Mar, 2009 by .

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Pressure Sensitive Tape Test- for Quantity of Flash Rust- NSRP Project The Pressure Sensitive Tape Test described by Hempel is a modification of ISO 8502-3 (Pressure Sensitive Tape test for dust) and is not mentioned in VIS-4.  The tape test can be used as a permanent record.  If lint deposition is a concern, the project […]

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Summary of Major Points- Flash Rust Project NSRP

Summary of Major Points- Flash Rust Project NSRP

Posted on 16. Mar, 2009 by .

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NSRP Flash Rust Project Metric Table, Control of Amount Summary of Major Points: 1.    Flash Rust is the rust that occurs from the time the waterjetting process starts to the time the water used for the waterjetting process dries. 2.    Control the quantity of Flash Rust by Project Planning           • During Removal Process           • As Water is drying […]

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Example of Heavy Flash Rust Swatch

Posted on 15. Mar, 2009 by .

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Example of Moderate Flash Rust Swatch:  Easy to prepare the swatches.  Keeps a constant light pressure.  Gives a clear distinction between light, moderate, and heavy.  The color transfers to only the cloth that is in contact with the surface. It can be difficult to interpret the various spots of color.

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Wipe or Sweep with Cloth Held in Hand

Posted on 15. Mar, 2009 by .

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Wipe or Sweep with a Cloth held in a hand  Make a bundle of cloth in your hand.  Swipe the dry cloth across the surface.  Make one swipe, up or down or sideways with the cloth touching the surface.  Try to avoid pressing the fingers against the surface. The following four pictures are examples of […]

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Classification of Flash Rust

Posted on 15. Mar, 2009 by .

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Light Flash Rust Light (L) flash rusted surface: A surface that, when viewed without magnification, exhibits small quantities of a rust layer through which the steel substrate may be observed.  The rust or discoloration may be evenly distributed or present in patches, but it is tightly adherent and not easily removed by lightly wiping with […]

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