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Crevice Corrosion Test

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EVALUATE CORROSION RESISTANCE ON STEEL

Seawater is quite a hostile environment for most engineering materials, and chloride in seawater is the most detrimental chemical species initiating a corrosion attack. Stainless steels generally show good resistance in seawater, but chloride ions may disrupt the passive film resulting in localized corrosion.

Crevice corrosion can cause complete failure with very little material loss, making it a major concern when using stainless steel. It is the phenomenon that metal surfaces form gaps due to foreign objects or structural reasons, resulting in accelerated metal corrosion in the gaps.

While many forms of corrosion are prominent with large areas of deterioration and discolouration, crevice corrosion can start with a tiny surface patch and spread quickly out of sight within the metal, underneath insulation, or inside tanks and vessels, leading to component or structural failure with little to no warning.

ASTM G48 – B

PTS performs crevice corrosion test conforming to ASTM G48 B, which involves the submersion of materials with a crevice-forming device in a 6% wt ferrite chloride solution typically for 24hrs duration at designated temperatures using a simulated crevice-forming device.

This test is normally used to assess stainless steel and related alloys for their crevice corrosion resistance at the welding procedure qualification stage.

Products designed for use at occluded spaces, such as interstices or rivets in the marine industry or aggressive chlorinated areas, are commonly evaluated using G48 – B and materials such as UNS S31603, S44735, N08367, N06022 are typically tested though they are non-exhaustive.

Seawater is quite a hostile environment for most engineering materials and chloride in seawater is the most detrimental chemical species initiating a corrosion attack.

Stainless steels generally show good resistance in seawater but chloride ions may disrupt the passive film resulting in localized corrosion.

Crevice corrosion has the potential to cause complete failure with very little material loss, making it a major concern when using stainless steel. It is the phenomenon that metal surfaces form gaps due to the presence of foreign objects or structural reasons, resulting in accelerated metal corrosion in the gaps.

COMMON AREAS SUBJECT TO CREVICE CORROSION INCLUDE:

Bolted and riveted connections

Under washers, gaskets, and clamps

Under insulation

At lap joints

In fastener threads

Application of Crevice Corrosion Test:

Evaluation of the corrosion resistance of stainless steel and related materials

Testing methods adapted to the material sample

Tests conducted in accordance with applicable standards or your specification

Evaluation of the corrosion resistance of stainless steels and related materials

ests conducted in accordance with applicable standards or your specification

Common Test Methods

ASTM G48 - B

Talk to us today

Different factors affect the corrosion rate of a material. Our expert testing team provide various exposure tests to examine the corrosion resistance properties of your material.

For more information on crevice corrosion tests, call us or send us an enquiry today.

process timeline

Process #1
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Lorem ipsum dolor sit amet, mea ei viderer probatus consequuntur, sonet vocibus lobortis has ad. Eos erant indoctum an, dictas invidunt est ex, et sea consulatu torquatos. Nostro aperiam petentium eu nam, mel debet urbanitas ad, idque complectitur eu quo. An sea autem dolore dolores.
Process #3
Lorem ipsum dolor sit amet, mea ei viderer probatus consequuntur, sonet vocibus lobortis has ad. Eos erant indoctum an, dictas invidunt est ex, et sea consulatu torquatos. Nostro aperiam petentium eu nam, mel debet urbanitas ad, idque complectitur eu quo. An sea autem dolore dolores.
Process #4
Lorem ipsum dolor sit amet, mea ei viderer probatus consequuntur, sonet vocibus lobortis has ad. Eos erant indoctum an, dictas invidunt est ex, et sea consulatu torquatos. Nostro aperiam petentium eu nam, mel debet urbanitas ad, idque complectitur eu quo. An sea autem dolore dolores.
Process #5
Lorem ipsum dolor sit amet, mea ei viderer probatus consequuntur, sonet vocibus lobortis has ad. Eos erant indoctum an, dictas invidunt est ex, et sea consulatu torquatos. Nostro aperiam petentium eu nam, mel debet urbanitas ad, idque complectitur eu quo. An sea autem dolore dolores.
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