DeCORE AFCI - 45

DeCORE AFCI-45 is also an excellent hydrotrope for alkaline systems as shown in the graph below. Performance was determined and compared to several other DeForest hydrotropes and to SXS-40.
Each hydrotrope was solubilized in a caustic or alkaline electrolyte solution followed by addition of nonylphenol ethoxylate (NPE-9.5). Each sample was heated to the temperature at which the NPE-9.5 clouds out of solution. The higher the cloud point temperature, the more efficient the hydrotrope.

Key: NaOH = Sodium Hydroxide, SMP = Sodium Metasilicate Pentahydrate, TKPP = Tetrapotassium Pyrophosphate

• Cloud Points of Test Solutions: 1% NPE-9 + 1.5% Hydrotrope (as-is), 97.5% Electrolyte

Metal Panel Submersion Test at Room Temperature
The bottom half of each metal panel was submerged in solution containing 0.25% - 1.0% DeCORE AFCI-45 by weight, in hard water (100 ppm as CaCO₃ & 71 ppm as chloride) at room temperature. The top half of the panel was exposed to the vapor phase in closed glass containers. All results are after 12 weeks elapsed.
Steel Panels: SAE 1010 Cold rolled steel (mild carbon)

Aluminum Panels, #2024 Bare Aluminum 90 Days Room Temperature

• Bottom half of panels are submerged in solution containing corrosion inhibitor, top half of panels are in the vapor phase.
• Solution contains 0.25% to 1.0% by weight corrosion inhibitor in hard water (100ppm CaCO₃ / 71ppm as chloride).

Copper Panels: #110 Copper (99.95% Cu) 90 Days Room Temperature

Brass Panels: #260 Brass Alloy (30% Zn / 70% Cu)

2024 Bare Aluminum (1 Year RT)

SAE 210 Cold Rolled Steel (90 Days)

110 Copper Panels (1 Year RT)

260 Brass Panels (1 Year RT)

• Bottom half of panels are submerged in solution containing corrosion inhibitor, top half of panels are in the vapor phase
• Solution contains 0.25% to 1.0% by weight corrosion inhibitor in hard water (100ppm CaCO₃ / 71ppm as chloride)

Test at Elevated Temperature & High Chloride Environments
Test Conditions

• Hard Water Solutions: 300 ppm as CaCO3 & 210 ppm as chloride
• DeCORE AFCI-45 level tested: 1.0% by weight (0.5% active)
• Solution pH: Solutions were adjusted with 0.1N NaOH from pH 6.25 to pH 8.75 - 9.0.
• Time/Temperature: 24 hours at Room Temperature (RT) and 200°F

The bottom half of each metal panel was submerged in solution whereas the top half of the panels were exposed to the vapor phase in closed glass jars. Controls do not contain corrosion inhibitor.
The following results indicate DeCORE AFCI-45 is an effective inhibitor for multiple metals under these test conditions.
Panels from left to right: RT control, RT w/inhibitor, 200°F w/inhibitor, 200°F control
Steel Panels: SAE 1010 Cold rolled steel (mild carbon)

Aluminum Panels, #2024 Bare Aluminum

Copper Panels: #110 Copper (99.95% Cu)

Brass Panels: #260 Brass Alloy (30% Zn / 70% Cu)

Flash rust can occur on steel after any wet method of surface preparation as the surface dries. It can occur quickly – within minutes- or at most, after a few hours. The following quick-screen test shows that DeCORE AFCI-45 is an effective flash rust inhibitor for cold rolled steel.

• First Beaker: Acidified tap water (pH 7.01) with a few drops of a 10% citric acid solution to final pH 5.35
• Second Beaker: 1% by weight DeCORE AFCI-45 added to acidified tap water to final pH 5.39
• Third Beaker: Acidified distilllled water (pH 5.53) with a few drops of a 10% citric acid solution to final pH 3.45
• Fourth Beaker: 1% by weight DeCORE AFCI-45 added to acidified distilled water to final pH 5.38

A cold rolled steel panel was placed into each solution and allowed to soak for ~1 hour at room temperature without covering the beakers. No rust was observed in the liquid phase on any of the panels prior to removing from solution. The steel panels were removed and allowed to air dry without rinsing.
Flash rust forms on the panels without DeCORE AFCI-45 present in solution within a few minutes of air drying. 

No flash rust forms on the panel with DeCORE AFCI-45 present.

Independent laboratory testing of DeCORE AFCI - 45 was conducted in duplicate at 2.0% by weight in 98% ethylene glycol (Defcool-2, Defcool-3) and compared to a commercial coolant (Defcool-1) containing 98% ethylene glycol and typical OAT corrosion inhibitors.