WSC 8890

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Use

WSC 8890 corrosion inhibitor provides excellent corrosion and deposit control for a variety of open recirculating cooling water systems, where deposit and corrosion free surfaces are required for system life and efficiency.

WSC 8890 is designed to provide minimum environmental impact while providing a highly effective corrosion control alternative.

WSC 8890 is very effective in low hardness, low alkalinity corrosive waters. It contains special filming ingredients to establish protective barriers against corrosion on ferrous metal surfaces. It also contains a proprietary blend of organic and polymeric sequestrants and dispersants to promote access of the corrosion control actives to corrosion sites.

WSC 8890 contains no molybdenum or chromate

 

Features

 WSC 8890 is a combination of an organophosphorus compound, zinc and polymer deposit control agent. This unique blend assures excellent conventional cathodic and anodic corrosion control.

The organophosphorous act as corrosion inhibitors, absorbing on to metal surfaces to form a protective film. This film acts as a barrier, denying access of oxygen to the metal surface, thus stiffling the corrosion process.

The incorporation of zinc into WSC 8890, gives additional cathodic metal protection. This results in a much more resistant and adherent barrier film on the metal surfaces than with other traditional blends.

 

Effective against primary water stress corrosion cracking (PWSCC)

 WSC 8890 is extremely effective against primary water stress corrosion cracking (PWSCC)

Ample measures have been taken to cope with this situation, including residual stress relief by heat treatment, modified scheduled inspections, and the use of tubing materials which have high resistance to PWSCC in modern power plants.

  • Effect of WSC 8890 addition on PWSCC

WSC 8890 addition is employed to prevent PWSCC in alloy 600MA tubing

Under simulated primary accelerated corrosion test conditions at 360°C, the susceptibility of alloy 600MA to PWSCC decreased with the addition of WSC 8890.

 

  • Investigation of the Mechanism of WSC 8890 Inhibition of PWSCC

Since it is considered that the condition of the surface oxide film may have a close relationship to the initiation of PWSCC, it is investigated the effect of WSC 8890 addition on the condition of the stainless steel’s alloy 600MA surface oxide film in detail.

The addition of WSC 8890 thinned the surface oxide film , and the corrosive products formed on the oxide film also decreased in quantity.

This result suggests that WSC 8890 is effective in inhibiting the corrosion reaction.

The surface oxide film was of double-layer structure when WSC 8890 was not added. The outer layer was rich in iron composition and poor in corrosion resistance, and the inner layer was rich in chromium and highly corrosion resistant.

When WSC 8890 was added, the outer layer rich in iron content disappeared, leaving only the highly corrosion resistant chromium layer .

 

 Advantages 

  • STABLE even at elevated skin temperatures.
  • EFFECTIVE corrosion control at stability indices as high as 10.
  • ANTIFOULANT properties, thus maximize heat transfer and minimize under-deposit corrosion.
  • PROTECTS against galvanic corrosion in mixed-metal systems.
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  • EXCEPTIONALLY EFFECTIVE control of pitting of ferrous metals.
  • CONVENIENT single-package treatment for corrosion and fouling.

 

 

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