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Novel Low-Cost Sample Holder Prevents Crevice Corrosion in Pitting Corrosion Tests

Picture for Novel Low-Cost Sample Holder Prevents Crevice Corrosion in Pitting Corrosion Tests
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For many corrosion-resistant alloys (CRA´s), crevice corrosion under gaskets, paint or O-rings required to define the exposed area and avoid solution contact with electrical connections interferes with measurements of the critical pitting potential (EPIT). This undesired and uncontrolled crevice corrosion occurs at a lower potential than the one for the onset of pitting corrosion. Many approaches have been used to avoid this artifact.

Product Number: 51323-19081-SG
Author: Edgar C. Hornus, Martín A. Rodríguez, Mariano A. Kappes
Publication Date: 2023
$0.00
$20.00
$20.00

An inexpensive holder for corrosion experiments was developed to avoid crevice corrosion during electrochemical tests for studying pitting corrosion of stainless steels and other corrosion-resistant alloys. The working principle follows Qvarfort’s electrochemical cell. Therefore, this holder enables measurements of pitting potentials of metals susceptible to crevice corrosion. The sample holder attaches to cylindrical or prismatic coupons cut from bars or plates. The coupon thickness has to be greater than 10 mm. The holder is suitable for any chloride concentration and solution temperature at ambient pressure. The testing solution can be deaerated or saturated with any gas if needed. The method was validated by cyclic potentiodynamic polarization experiments on alloys UNS S30400, S31600 stainless steel and nickel-base alloys UNS N08031 and N07022. Results show that the pitting repassivation potential decreases linearly with temperature. Pitting repassivation potentials on stainless steels were 100-150 mV higher than the corresponding crevice repassivation potentials obtained by the PD-GS-PD method. Undesired localized corrosion near the holder electrical connection was not evident in multiple replicate specimens tested with the proposed method.

An inexpensive holder for corrosion experiments was developed to avoid crevice corrosion during electrochemical tests for studying pitting corrosion of stainless steels and other corrosion-resistant alloys. The working principle follows Qvarfort’s electrochemical cell. Therefore, this holder enables measurements of pitting potentials of metals susceptible to crevice corrosion. The sample holder attaches to cylindrical or prismatic coupons cut from bars or plates. The coupon thickness has to be greater than 10 mm. The holder is suitable for any chloride concentration and solution temperature at ambient pressure. The testing solution can be deaerated or saturated with any gas if needed. The method was validated by cyclic potentiodynamic polarization experiments on alloys UNS S30400, S31600 stainless steel and nickel-base alloys UNS N08031 and N07022. Results show that the pitting repassivation potential decreases linearly with temperature. Pitting repassivation potentials on stainless steels were 100-150 mV higher than the corresponding crevice repassivation potentials obtained by the PD-GS-PD method. Undesired localized corrosion near the holder electrical connection was not evident in multiple replicate specimens tested with the proposed method.

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Steel structures are often fabricated by bolting (or riveting) structural components together. Bolted joints result in multiple crevices between the bolted members and fasteners. These crevices are typically more susceptible to corrosion than flat surfaces because they tend to retain water/contaminants, they are difficult to properly coat, and the crevice geometry tends to support electrochemical phenomena that accelerate corrosion. This paper will evaluate the effectiveness of various coating practices at mitigating corrosion around these joints.
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Localized Corrosion Managing Clamp in a Crevice Between Clamp and CRAs Pipe/Tube Line

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