MINISTRY OF EDUCATION
AND TRAINING
VIETNAM ACADEMY OF
SCIENCE AND TECHNOLOGY
GRADUATE UNIVERSITY OF SCIENCE AND TECHNOLOGY
……..….***…………
HOANG LAM HONG
STUDY ON THE FORMATION AND CORROSION
PROTECTIVENESS OF RUST LAYER ON WEATHERING STEEL
IN TROPICAL ATMOSPHERE OF VIETNAM
Major: Metallography
Code number: 9.44.01.29
ABSTRACT OF THESIS
Hanoi – 2019
The Thesis finished at Graduate University of Science and
Technology - Vietnam Academy of Science and Technology
Supervisors: Assoc. Prof. Dr. Le Thi Hong Lien
Dr. Pham Thy San
Opponent 1: Assoc. Prof. Dr. Nguyen Xuan Hoan
Opponent 2: Assoc. Prof. Dr. Nguyen Van Tu
Opponent 3: Prof. Dr. Mai Thanh Tung
The Thesis will be defended at the doctoral council which organizes
by Graduate University of Science and Technology - Vietnam
Academy of Science and Technology at ….. h…’ date ………..2019
The Thesis can find out at:
- The Library of Graduate University of Science and Technology
- National Library of Vietnam
THE LIST OF PUBLISHED PAPERS
1. Le Thi Hong Lien and Hoang Lam Hong, “Characteristics of corrosion product
layer formed on weathering steel exposed to the tropical climate of Vietnam”,
Material Science and Application, Vol. 4, 7A, 2013, pp. 6-16, USA.
2. Le Thi Hong Lien and Hoang Lam Hong, “Study on atmospheric corrosion of
weathering steel in Vietnam”, Proceeding of JSCE Material and environments
2014.
3. Hoang Lam Hong, Le Thi Hong Lien and Pham Thi San, “Atmospheric
corrosion of weathering steel in marine environment of Viet Nam”, Tạp chí
Khoa học và công nghệ, tập 53-1B (2015).
4. Thy San P., Hong Lien L.T., Lam Hong H., Trung Hieu N., Thanh Nga N.T.,
“Establish mathematical models to predict corrosion of carbon steel and
weathering steel in atmosphere of Viet Nam”, Tạp chí Khoa học và công nghệ,
tập 53-1B (2015).
5. Le Thi Hong Lien and Hoang Lam Hong, “Corrosion behavior of weathering
steel in atmosphere of Vietnam”, Proceeding of JSCE Material and
environments 2015.
6. Le Thi Hong Lien, Hoang Lam Hong, Pham Thi San, “Corrosion behavior of
weathering steel in tropical atmosphere of Vietnam”, International Journal of
Engineering Research and Science (IJOER), Vol.2, Issue 11 (2016)
7. Le Thi Hong Lien, Hoang Lam Hong, Pham Thi San, Nguyen Trung Hieu and
Nguyen Thi Thanh Nga, “Atmospheric corrosion of Carbon steel and
Weathering steel – Relation of corrosion and environmental factors”,
Proceeding of JSCE Material and environments 2016.
1
PREFACE
Weathering Steel (WS) is low alloy steel that has been using as un-painted
steel in mild atmosphere due to forming protective layer of corrosion product
(rust) on steel substrate, which can act as a protective barrier against the inward
transportation of corrosive species. Using the WS on steel structures reduces the
material cost, especially reduces maintenance cost of anti-corrosion whichis
effectively applied WS to works of transportation, bridges, works of the
century.
WS has been used popular in temperate zones due to its corrosion resistance.
However, the WS types have just stated using in Vietnam. The possibility to
apply of the weathering steel in the humid tropical climate with heavy rain of
our country has not been fully and systematically researched. So, in order to
build the scientific bases of applying WS to construction works, highway
bridges, works of the century, ... in Vietnam, and provide the necessary
information for selecting and using effectively WS (Corten B) in each climatic
region, the author selected the thesis titled: “Study on the formation and
corrosion protectiveness of rust layer on weathering steel in tropical
atmosphere of Vietnam”
The purpose of thesis:
Research on the influence of climatic and environmental parameters to the
formation, structure and properties of corrosion products formed on the
WS surface in different climatic regions of Vietnam.
Research on the mechanism of forming protective rust layer on WS and
corrosion resistance of WS in tropical climate of Vietnam.
The research object: Corten B steel.
Methods for research:
In order to research the ability of forming protective rust layer on WS in
the Vietnam climate, WS was exposed to three different climate zones: (1)
Northern (Hanoi) with four seasons, the temperature in the year fluctuates
sharply, high humidity, long time of wetness and cold winter; (2) The
humid marine atmosphere at Dong Hoi with seasonal temperature changes
and high content of airborne sea salt; (3) Dry marine atmosphere at Phan
Rang with low rainfall and high temperature in the year. The impacts of
climatic and environmental parameters on atmospheric corrosion of WS
were studied using the samples exposed at 15 difference climatic zones in
Vietnam: Son La, Yen Bai, Tam Dao, Cua Ong, Con Vanh, Hanoi, Dong
Hoi, Quang Ngai, Pleiku, Phan Rang, Bien Hoa, Ho Chi Minh City, Can
Tho, Rach Gia and Ca Mau.