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ScaleSolv® - Biodegradable Carbonate Descaler for Cooling Towers

ScaleSolv® Advantage:

ScaleSolv® is designed to descale carbonate deposits found in water operated equipment, such as, boilers, cooling towers including galvanized cooling towers, closed loops, heat exchangers, and aluminum molds. The main advantage of ScaleSolv® is the low impact - low corrosion - on the cleaned metal. ScaleSolv® is a unique carbonate descaler to be used on galvanized, aluminum, and zinc cooling towers.

The Benefits of Cleaning with ScaleSolv® Carbonate Descaler

  • Non-Regulated for transportation
  • Non-Corrosive to skin
  • Non-Corrosive equipment
  • Non-Hazardous and Biodegradable
  • Prevents flash corrosion post cleaning
  • Prevents dissimilar metal plating
  • Safe to use on galvanized metals, aluminum, carbon and stainless steel, copper, brass, and plastic
  • The pH Advantage
  • The CorroShieldTM Advantage

   Non-regulated for DOT transportation:

ScaleSolv® is non-regulated for DOT transportation.   It meets the requirements of corrosion on clad aluminum, carbon steel C-1020 and membrane skin test destruction established in the Code of Federal Regulations 40 CFR 173.137.

 Non-corrosive to skin:

ScaleSolv® is non-corrosive to skin in accordance to the 1992 OECD (Organization for Economic Cooperation and Development) Guideline for Testing of Chemicals, Number 404 “Acute Dermal Irritation/Corrosion”.  The test is an in vitro test accepted by DOT, in lieu of animal testing, as corrosivity measurement.

 Non-corrosive to equipment

ScaleSolv® is non-corrosive to equipment in accordance to MIL-I-17433C(SH) and 40CFR 173.137.

 The following table shows the corrosion rates with ScaleSolv® compared to the MIL specifications.

 

Corrosion rates in mils per year (MPY) for different metallurgy

 

Mild Steel

Stainless

Copper

Brass

Zinc

Aluminum

ScaleSolv® Neat

18.02

0.08

3.63

3.01

11.36

36.25

ScaleSolv® 25%

19.61

0.25

2.67

12.56

24.56

18.24

MIL Specs*

420.48

 

 

 

 

 

*MIL Specs. are the accepted corrosion rates when descaling boilers with hydrochloric acid according to the military specifications 

Non-hazardous and biodegradable:

ScaleSolv® does not contain environmentally hazardous ingredients.  Its major component has the status of GRAS (Generally Regarded as Safe) by the U.S. Food and Drug Administration. This component is also accepted for direct use in animal feed. It also has a low potential for bio-accumulation.

 Components of the inhibitor are also of low toxicity to the environment and are subjected to biological and photochemical degradation

Prevents Flash Corrosion Post Cleaning:

ScaleSolv® contains CorroShieldTM, a proprietary filming and passivating inhibitor.   It acts as a barrier against oxidation that normally occurs immediately after acid cleaning.   Both protective modes are effective only for a dry storage.

Prevents Dissimilar Metal Plating:

ScaleSolv® prevents dissimilar metal plating when acid cleaning equipment that contains various metallurgy, i.e., steel, copper, galvanized, etc.

The fact is even inhibited acids will dissolve metals.  The only question is how much and how fast?  The rate of dissolution depends on the type of acid, the acid strength, the contact time, and the type of inhibitor.   In systems that contain various metallurgy, such as, steel, copper, and galvanized metals, acid cleaning will dissolve all these metals to some varying degree, and the resulting dissolved metals will plate on each other’s base metals.   For example, copper will plate on steel, leading to localized galvanic cells that can produce pitting corrosion.  Another nuisance of metal ions solubilization is the acceleration of corrosion on other metals.  For example, dissolved copper ions will react with the zinc on the galvanized coating, thus corroding and weakening the integrity of the coating.

ScaleSolv® contains the CorroShield inhibitor, which is responsible for preventing dissimilar metal plating.  It does so by minimizing the amount of metal solubilization.   It then chelates any dissolved metal ions, preventing them from plating and reacting with other metals.

 

The pH Advantages:

ScaleSolv® has several pH advantages over other inhibited acids.  

  • It works at a higher pH than other inhibited acids.
  • Over-neutralization does not cause a spike in pH - Buffer Capacity
  • The amount of caustic required for neutralization can be derived indirectly from the pH.

ScaleSolv® works at a higher pH.  

At any given acid strength, ScaleSolv® has a higher pH than hydrochloric, sulfamic and other commercial acid carbonate descalers. Generally speaking, the higher the pH, the less aggressive the acid solution is on any metals, and vice versa.  Since ScaleSolv® has a higher pH at any given acid strength, this explains why it is less aggressive than other inhibited acids.

The chemical basis for mild pH is how the hydrogen ion is released into the water solution (ionization).  Other inorganic acids release their hydrogen ions almost all at once, thus the pH drop very low very quickly.  Whereas, ScaleSolv® releases its hydrogen ions slowly (partial ionization) as it is consumed, so the pH does not drop as low. This phenomenon is responsible for the difference in aggressiveness between ScaleSolv® and the other inhibited acids.

The pH levels of the ScaleSolv® program can be used as a measurement of the acid strengths

It’s important to know the remaining acid strength as it correlates to the remaining cleaning capacity.  It also correlates to how much caustic is required to neutralize the remaining acid.

Since ScaleSolv® is made of weakly dissociated acids and inhibitors, the measurement of pH correlates closely to the acid concentration in solution. This feature is not achievable with inorganic or heavily dissociated acids. For those acids descalers titration will be required to determine the acid strength.

Another method to determine acid strength is by titration.  But this method can be cumbersome.  Furthermore, titration is not reliable in acid cleaning applications due to the increasing turbidity and color of the acid solution.   So, when using the other acids for descaling, there is no easy and reliable way to determine the remaining acid strengths.

Over-neutralization does not cause a spike in pH.

Neutralizing the pH after Scale Removal (Carbonate descaling) is required by law. Normally to drain the system, pH is required to be between 5 to 9 (depending on local regulations). Neutralization of inorganic and some strong organic acids with caustic may produce the pH to jump from acid to alkaline if there is no buffering capacity around the pH range accepted for disposal.

ScaleSolv® neutralizes gradually with caustic. This is because ScaleSolv® is a buffered acid in the range of 5-8 pH.  So it is able to absorb a lot of caustic without overshooting the pH.   Whereas, the pH of other inorganic acids jump exponentially after a pH of around 2.  This means that neutralizing these acids has very little room for error.  Any slight over-neutralization of these acids could easily overshoot the pH, requiring a need for reversed pH adjustments.   Reversing this process has the same tight constraints.   Neutralization of these acids can be more difficult to achieve and time consuming, especially where mixing is a challenge.

 

 The CorroShield® Advantage

ScaleSolv® contains the CorroShield® inhibitor.  CorroShield® is a proprietary filming inhibitor that protects the base metal from corrosion during acid cleaning.   It has chelating properties, thus it chelates metal ions at low pH preventing dissimilar metal plating.  It has passivating properties, thus it protects the base metal from corrosion post cleaning.  For further information, please refer to the technical bulletins on CorroShield®.

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