The Development Of Multifunctional Corrosion Inhibitors For Aerospace Applications
Report Number: AFWAL-TR-81-4019 Volume II p. 345-384
Author(s): Khobaib, M., Vahldiek, F. W., Lynch, C. T.
Corporate Author(s): Systems Research Laboratories, Inc., Air Force Wright Aeronautical Laboratories, Materials Laboratory (AFWAL/MLLN)
Laboratory: Materials Laboratory
Date of Publication: 1980-11
Pages: 40
DoD Task:
Identifier: This paper is part of a conference proceedings. See ADA115875
Abstract:
The development of inhibitors for aerospace applications such as automated rinsing of aircraft requires systems of high solubility, low toxicity, and reasonable cost which are effective on a wide variety of high-strength corrosion- susceptible alloys. Chromate-based products, in combination with polyphosphates, have been reasonably effective against corrosion of ferrous and nonferrous metals and alloys and are presently the most widely used inhibitors. The use of chromates, however, has been the subject of ecological concern, and the present investigation involves the development of non-toxic, multifunctional water-soluble inhibitors. The performance of a large number of nonchromate inhibitors has been studied and a borax-nitrite-based formulation developed which inhibits the corrosion of both ferrous and nonferrous alloys. This formulation consists of a combination of low-toxicity components and is effective in preventing localized corrosion and accelerated crack growth as well as general corrosion. Effectiveness in aggressive environments including synthetic urine has been demonstrated. Applications include lower-bay, galley, and related areas of large aircraft and automated aircraft rinse facilities. Field evaluations are underway.
Author(s): Khobaib, M., Vahldiek, F. W., Lynch, C. T.
Corporate Author(s): Systems Research Laboratories, Inc., Air Force Wright Aeronautical Laboratories, Materials Laboratory (AFWAL/MLLN)
Laboratory: Materials Laboratory
Date of Publication: 1980-11
Pages: 40
DoD Task:
Identifier: This paper is part of a conference proceedings. See ADA115875
Abstract:
The development of inhibitors for aerospace applications such as automated rinsing of aircraft requires systems of high solubility, low toxicity, and reasonable cost which are effective on a wide variety of high-strength corrosion- susceptible alloys. Chromate-based products, in combination with polyphosphates, have been reasonably effective against corrosion of ferrous and nonferrous metals and alloys and are presently the most widely used inhibitors. The use of chromates, however, has been the subject of ecological concern, and the present investigation involves the development of non-toxic, multifunctional water-soluble inhibitors. The performance of a large number of nonchromate inhibitors has been studied and a borax-nitrite-based formulation developed which inhibits the corrosion of both ferrous and nonferrous alloys. This formulation consists of a combination of low-toxicity components and is effective in preventing localized corrosion and accelerated crack growth as well as general corrosion. Effectiveness in aggressive environments including synthetic urine has been demonstrated. Applications include lower-bay, galley, and related areas of large aircraft and automated aircraft rinse facilities. Field evaluations are underway.