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naca-tn-4287

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Relationship of Metal Surfaces to Heat Aging Properties of Adhesive Bonds

A study was made to determine the probable causes of deterioration
of each of several adhesives in bonds to stainless steel at temperatures
from #000 to 5500 F. Preliminary studies of aluminum surfaces on which
ions of metals used in stainless steel were introduced showed that iron
was probably catalyzing a thermal deterioration of the adhesive. The
resistance of FPIPSTS adhesive to thermal deterioration at 550° F on
steel was improved significantly by treating the steel surface to be
bonded with either zinc or cerium naphthenate and firing at 1,2000 F.
The addition of manganese dioxide to the adhesive also increased its
resistance to thermal deterioration. A study of the thermal—aging prop—
erties of five different chemical types of adhesives on stainless steel
and aluminum revealed that a phenol-nitrile rubber adhesive was superior
to a phenol-epoxy adhesive on steel, but this order was reversed on
aluminum. These and other observations indicated probable specific
relationships among the chemical structure of the adhesive, the metal
adherend, and the resultant thermal stability of bonds after aging at
high temperatures.

Adhesive bonds in metals may react in two ways when subjected to
elevated temperatures. The adhesive may soften and lose a considerable
part of its initial strength merely because of thermal softening. Much
of this loss may be regained when the adhesive cools. The adhesive may
also permanently lose strength because of thermal aging at elevated tem-
peratures. This loss involves chemical deteriorations that probably
have definite rate effects and are irreversible.

The work reported herein has been directed toward establishing
probable causes and mechanisms for the erratic and generally unsatis-
factory resistance of adhesive bonds on certain metals to thermal aging
at temperatures up to 550° F. In previous work (ref. 1) adhesive bonds
on certain metals, particularly stainless steel, made with a phenol-epoxy
resin adhesive were shown to have generally low resistance to thermal
aging, while bonds of the same adhesive on aluminum were quite high in
heat resistance. Low resistance to aging at elevated temperatures_has
also been observed for a phenol-epoxy resin adhesive in bonds on tita—
nium, brass, copper, and low-carbon steel.

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naca-tn-4287

  • Version
  • 112 Downloads
  • 1.31 MB File Size
  • 1 File Count
  • April 15, 2017 Create Date
  • April 15, 2017 Last Updated
Scroll for Details

Relationship of Metal Surfaces to Heat Aging Properties of Adhesive Bonds

A study was made to determine the probable causes of deterioration
of each of several adhesives in bonds to stainless steel at temperatures
from #000 to 5500 F. Preliminary studies of aluminum surfaces on which
ions of metals used in stainless steel were introduced showed that iron
was probably catalyzing a thermal deterioration of the adhesive. The
resistance of FPIPSTS adhesive to thermal deterioration at 550° F on
steel was improved significantly by treating the steel surface to be
bonded with either zinc or cerium naphthenate and firing at 1,2000 F.
The addition of manganese dioxide to the adhesive also increased its
resistance to thermal deterioration. A study of the thermal—aging prop—
erties of five different chemical types of adhesives on stainless steel
and aluminum revealed that a phenol-nitrile rubber adhesive was superior
to a phenol-epoxy adhesive on steel, but this order was reversed on
aluminum. These and other observations indicated probable specific
relationships among the chemical structure of the adhesive, the metal
adherend, and the resultant thermal stability of bonds after aging at
high temperatures.

Adhesive bonds in metals may react in two ways when subjected to
elevated temperatures. The adhesive may soften and lose a considerable
part of its initial strength merely because of thermal softening. Much
of this loss may be regained when the adhesive cools. The adhesive may
also permanently lose strength because of thermal aging at elevated tem-
peratures. This loss involves chemical deteriorations that probably
have definite rate effects and are irreversible.

The work reported herein has been directed toward establishing
probable causes and mechanisms for the erratic and generally unsatis-
factory resistance of adhesive bonds on certain metals to thermal aging
at temperatures up to 550° F. In previous work (ref. 1) adhesive bonds
on certain metals, particularly stainless steel, made with a phenol-epoxy
resin adhesive were shown to have generally low resistance to thermal
aging, while bonds of the same adhesive on aluminum were quite high in
heat resistance. Low resistance to aging at elevated temperatures_has
also been observed for a phenol-epoxy resin adhesive in bonds on tita—
nium, brass, copper, and low-carbon steel.

FileAction
naca-tn-4287 Relationship of Metal Surfaces to Heat Aging Properties of Adhesive Bonds.pdfDownload 
17,005 Documents in our Technical Library
2449877 Total Downloads

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Newest Additions

NASA-RP-1060 Subsonic Aircraft: Evolution and the Matching of Size to Performance
NASA-RP-1060 Subsonic Aircraft: Evolution and the Matching of Size to Performance
AA-CP-20212-001
AA-CP-20212-001
ADPO10769 Occurrence of Corrosion in Airframes
The purpose of this lecture is to provide an overview ...
MIL-STD-1759 Rivets and Rivet Type Fasteners Preferred for Design
The purpose of this book form standard is to provide ...
MIL-STD-810G Environmental Engineering Considerations and Laboratory Tests
This standard contains materiel acquisition program planning and engineering direction ...