Abstract
Surface preparation of engineering materials is necessary for preventing corrosion and subsequent failure of materials in service. There are different methods of surface preparations that can affect engineering materials in different ways. This study investigated the effect of surface preparation on the corrosion behavior of zinc sprayed and unsprayed mild steel. Quantitative analysis and potentiodynamic polarization techniques were used to evaluate the immersed samples of different surface preparations. The results indicated that the least corrosion rate was observed for the uncoated sample prepared with CC1200 grit paper at 0.041 mpy and successive samples in the order of CC220 grit paper at 0.047 mpy < P60 grit paper at 0.052 mpy < filing at 0.064 mpy and grinding at 0.074 mpy after 42-days of immersion. The prepared samples that were further coated with zinc spray demonstrated a similar trend. The sample prepared with CC1200 grit paper and further coated with zinc spray exhibited the lowest corrosion rate of 1.35 x 10-9 mpy. Potentiodynamic polarization results further suggested that the same behavior was observed in the quantitative analysis.
Highlights
Corrosion of metals is one of the oldest problems that have ever challenged the industrial world and is defined variously [1]
The surface preparation has no significant effect on the mild steel in the first seven days of immersion due to the presence of zinc spray
The active-passive region of the immersed mild steel is a function of the exposure time, surface preparation, and inhibitor used
Summary
Corrosion of metals is one of the oldest problems that have ever challenged the industrial world and is defined variously [1]. It was described theoretically that surface roughness could influence the electrochemical or mechano-chemical behavior of a surface. Such conditions could promote different interactions in the micro-electrical behavior and will impact the corrosion rate [2]. A number of studies have been carried out to investigate various aspects of surface roughness and modification in relation to the corrosion rate. Li et al [9] investigated the significant effect of single and multiple steps pickling of 304 stainless steel in acid electrolyte. The objective of this study is to investigate the effect of surface preparation on the corrosion behavior of zinc-coated mild steel in seawater
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