Corrosion at the Polymer-Metal Interface in Artificial Seawater Solutions

Table 2

Deformation of Buna-N and EPDM O-rings fitted on 316 stainless steel.^a

Entry	O-Ring	Starting ID (mm)	Final ID (mm)	ΔID (mm)	Crevice corrosion^b	316 stainless steel
1	Buna-N round	12.3	14.66–14.99	2.36–2.69	Severe
2	Buna-N quad	12.3	13.74–13.80	1.44–1.50	Moderate
3	EPDM round	12.3	13.43–13.50	1.13–1.20	None

^aData for two Buna-N round, two Buna-N quad, and two EPDM O-rings. ^bnone: no observable crevice corrosion under O-ring, low: minimal surface indentation due to crevice corrosion, moderate: small surface indentation, and severe: large surface indentation.