Browse Prior Art Database

Inhibition of MnFe Corrosion

IP.com Disclosure Number: IPCOM000101086D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 1 page(s) / 53K

Publishing Venue

IBM

Related People

Frankel, GS: AUTHOR [+2]

Abstract

Disclosed is a method to inhibit the corrosion of manganese-iron (MnFe) in aqueous solutions. The addition of small amounts of an inorganic inhibitor, such as but not limited to N-lauroylsarcosine (NLS), can reduce the corrosion rate of MnFe by over 100X.

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Inhibition of MnFe Corrosion

       Disclosed is a method to inhibit the corrosion of
manganese-iron (MnFe) in aqueous solutions.  The addition of small
amounts of an inorganic inhibitor, such as but not limited to
N-lauroylsarcosine (NLS), can reduce the corrosion rate of MnFe by
over 100X.

      Alloys of Mn and Fe potentially have interesting applications
in the electronics industry.  Due to the high reactivity of Mn,
however, MnFe alloys are extremely susceptible to corrosion.
Degradation may occur during exposure to various process liquids or
due to atmospheric corrosion between processing steps and during
lifetime exposure.

      It has been found that MnFe can be passivated in aqueous
solutions containing sodium borate due to an increase in pH and
buffering of the solution.  In an air-saturated solution consisting
of 30% ethylene glycol and 0.1M sodium borate, MnFe is stable only in
the active state, dissolving at the high rate of approximately 5 x
10-5 A/cm2. In order to passivate MnFe in this solution, it is
necessary to polarize it past the active region to high potentials.
There is a very large potential region in this solution in which MnFe
is in the active state, dissolving at rates up to 1 x 10-3 A/cm2 .
If the potential of MnFe in such a solution is not controlled to
sufficiently high values for any reason, it will suffer very
accelerated attack.

      It is possible to further reduce corrosion in aqueous solutions
by adding small amoun...