Corrosion at the Polymer-Metal Interface in Artificial Seawater Solutions

Table 3

Crevice corrosion and surface oxidation of varying metal alloys fitted with round Buna-N O-rings.^a

Entry	Metal	pH range	Crevice corrosion^b	Surface oxidation^c	Metal alloys
1	Titanium alloy	5.64–6.14	None	None
2	Nickel alloy 625	5.60–6.20	None	None
3	316 stainless steel	6.19–6.41	Severe	Moderate
4	4130 steel	7.41–8.30	Low	Severe
5	Bronze	8.63–8.68	Low	Severe
6	Aluminum alloy	7.31–7.74	Low	Severe

^aData for three samples of each metal alloy. ^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. ^cnone: no observable oxidation over entire surface of metal, low: 0–25%, moderate: 25–75%, and severe: 75–100%.