Program on Data Sheet on Atmosperic Corrosion Properties for Low Alloy Steels
Corrosion or corrosion resistance of metallic materials
is recognized as one of the most inportant factors to be
considered in designing metallic structures such as steel
brigdes and chemical plants with higher reliability. The
flood of data has been accumulated by a lot of researchers'
efforts up to now.
However, corrosion of the materials is generally influenced
by many metallugical , geometrical and environmental
factors, and the diversity of these factors makes it in reality
difficult to find appropriate corrosion data among the
accumulated test data. Especially, the influence of environmental
factors is extremely large for the atmospheric
corrosion of metalls. Since these data are based on test
results acquired independently in different laboratories for
different purposes, a lack of consistency is sometimes inevitable.
Systematic work to generate reliable atmosperic
corrosion data seems to be necessary in order to comprehend
properly the characteristics of atmosperic corrosion
in materials and to become the research indicator of new
anti-corrosion material development.
National Institute for Materials Science (NIMS) has
executed the atmospheric corrosion research on metallic
materials and organic coating so far. The planning of new
exposure test program started in 1997 and the new facilities
for atmospheric exposure examination were established
at NIMS. This facilities are eqipped with 4 opened flames
and 4 sheltered flames for exposure test, and one meteorological
observation device refer to Figure 1-3
The NIMS atmosphere corrosion data sheet is aimed to
clarify systematically the standard characteristics of atmospheric
corrosion about various metallic materials used
for the structures which atmospheric corrosion is important,
and the basic alloy materials that becomes an indica-tor
for new anti-corrosion material developments. For this
purpose, test materials are sampled by NIMS from the current
commercial products of representative manufactureres
in this country, and exposure tests are going to be carried
out at NIMS according to standard test procedures (see
for materials tested,
and Table 2
for the test schedule).
Test alloys are made by representative manufactureres.
The data sheets will serve as variable guide, not only for
design engineers but also for investigators in the fields of
corrosion science and engineering.
In order to determine the most effective direction for
this program, an advisory committee for data sheets was
instituted at NIMS in 2001 in cooperation with leading
specialists from related academic and industrial societies
in Japan. To this is attached a technical advisory commit-tee,
for the purpose of planning the program in the best
way. The menbers for these comittees are given in Appen-dixA.
On May 20, 2002, NIMS obtained ISO 9001 Certifica-tion
for the Quality Management Systems for our Materi-als
Data Sheet Project, and Creep test and Accident In-vestigation
Services that are closely related to the project.
NIMS intends to continuously improve the reliability and
quality of our research and related services while always
using the ISO 9001 standard as a basic criterion. Listening
to and responding to clients' requests are standard oper-ating
procedures in our research and service programs.
Figure and Table
Fig.1 Outline of NIMS exposure test site.
Fig.2 Outline of open exposure test flame.
Fig.3 Outline of sheltered exposure test flame.
Table 1 Materials for atmospheric corrosion test
|Fe-Ni binary alloy||Fe-1%Ni||melt||Plate|
|Fe-Cr binary alloy||Fe-1%Cr||melt||Plate|
|Fe-Si binary alloy||Fe-1%Si||melt||Plate|
|Fe-Al bianry alloy||Fe-1%Al||melt||Plate|
|Fe-Cu binary alloy||Fe-0.4%Cu||melt||Plate|
|Fe-P binary alloy||Fe-0.5%P||melt||Plate|
Table 2 Schedule of sampling of test pieces and issue of corrosion data sheets