Abstract
The effect of mechanical and chemical surface treatment of high-strength low alloy steel S355J2 on its electrochemical characteristics was investigated by voltamperic tests in corrosive environment of 0.1M NaCl solution simulating sea atmosphere. Mechanical surface treatment was done by grinding on 1200 grit paper and by sandblasting. Chemical surface treatment was performed by iron phosphating in aqueous solution of H3PO4 and FeCl3.6H2O. Thermodynamic and kinetic corrosion characteristics including corrosion potentials and corrosion current densities were measured and analysed by potentiodynamic polarisation curves and Tafel analyses respectively. The positive combination of these two techniques on corrosion properties of S355J2 steel surface was reported.
Highlights
There are two main grades of High Performance Steels (HPS), namely High Strength Low Alloyed (HSLA) and High Strength Steels (HSS)
As can be seen, sandblasting caused mild surface deformation up to 10 microns of depth, which is appropriate in terms of surface roughness increase and surface oxide cleaning
Phosphating process was performed for 5 minutes at the temperature of 90-95 °C
Summary
There are two main grades of High Performance Steels (HPS), namely High Strength Low Alloyed (HSLA) and High Strength Steels (HSS). High strength low alloyed (HSLA) steels were primarily developed to replace low-carbon steels for the automotive industry in order to improve the strength-to-weight ratio and meet the need for higher-strength construction grade materials. HSLA steels demonstrate unique properties, such as high strength, excellent ductility, good weldability and exhibit outstanding low temperature impact toughness superior to that of high yield strength (HY) steels. HSLA steels have much improved weldability compared to HY steels [4]. HSLA steels become an indispensable class for different applications like construction of large ships, oil and gas transmission lines, offshore oil drilling platforms, pressure vessels, building construction, bridges and storage tanks [5]. S355J2 steel is one of the most commonly used member of HSLA steel grade. For many applications, proper surface pretreatment and painting has to be used to improve its surface quality
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