Vol 7, No 3 (2016) > Metalurgy and Material Engineering >

Crevice Corrosion Study of SAF 3207 HD in 6% FeCl3 Solution using Polarization, Weight Loss, and Electrochemical Impedance Spectroscopy Methods

Rini Riastuti, Mega Herawati Arifiana Amanah Notonegoro, Adam Hidana Yudo Saputro

 

Abstract:

Hyperduplex Stainless
Steel 3207 (SAF 3207 HD) is one of the materials used in the oil and gas
industry, especially for umbilical, which is a system to connect cables or
instrumental setups between control platforms and wellhead station. It is used
in deep water containing high chloride ion (Cl-), so it needs high
tensile strength and must be a highly corrosion-resistant material. In this
research, several corrosion resistance tests were conducted on 3207 hyperduplex
stainless steel such as polarization and weight loss testing. Roughness surface
tests were carried out to observe alterations to the surface caused by
underwater corrosion. SAF 3207 HD can form a passive layer due to an
environmental reaction; to observe this phenomenon, an EIS test was conducted
at the interface of the material. The weight loss test was conducted on a particular sample, in accordance
with ASTM G48-97 method B. The corrosion test was carried out at temperatures
of 60-90°C (at 5°C intervals) in 6% FeCl3 solution. The results
show that SAF 3207 HD has good crevice corrosion resistance, although crevices
were not seen below temperatures of 70oC, which is known as critical
crevice temperature. At this temperature, the corrosion rate reached 10.032
mm/year and the crevice depth was 1.034 μm. This means that the operating
temperature of the umbilical can be increased up to 70oC.

Keywords: Corrosion; Crevice; EIS ; Hyperduplex stainless steel; Polarization

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References


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