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I think that such residual elements participate in a kind of massive passive film in sulfur dichloride environment and weaken it in case of corrosion-erosion phenomena, at least this is my thought (it is scientifically proved in hydrofluoric acid carbon steel corrosion) DEKLERK

Does anyone have experience of selective corrosion and/or erosion/corrosion of Heat Affected Zone of carbon steel (ASTM A106 Gr. B)pipe weldment in sulfur dichloride service. I registered a greater amount of residual elements as Cu and Cr in corroded pipe in comparison with some uncorroded pipe...

Does anyone have experiece of Stress corrosion cracking of 304 Stainless steel components in steam reforming plant in low temperature shift converter section ? Thanking in advance. DEKLERK

Thanks for the indications. The construction material is Carbon Steel, that is susceptible of SCC in the mentioned environment. I think that with single sided weld transversal resisual stresses can be reduced on the internal surface in comparison with double sided weld, but not longitudinal...

Does anyone know if it is reasonable to expect SCC problem in a coke oven gas primary cooler ? What kind of SCC can be expected (H2S, Carbonate,Alkaline.....)? It is true that a single side weld (not back gouged) can reduce the susceptibility to SCC problem in such a component ? In my opinion...

It is possible that a special HIC grade steel (clean steel) fails after few hours in NACE TM-0177 SSC test (method A) due to SOHIC phenomena? Does anyone know if this type of steel is more susceptible to such SOHIC phenomena than no extra-low sulphur steels ? Regards DEKLERK

Hi It is possible any impingmet/erosion type corrosion on monel alloy in 99% HF environment? I would apprecaite any advice. Thanks

My problem occured on INCONEL 600 thermocouple sheaths in a process fluid water/CO/CO2 at 53 bar and 235° C(in the reactor but i think the temp. less in corresponndence with the corrosion phenomena). The corrosion phenomena are localized on the therm. sheaths near the brazed joint to the 304...

I agree with the fact that the superficial passive oxide protect tha bare metal from the CO bearing gas ( even if I think that Ni-Oxyde would be present in the inner layer of the oxide film, but not in the external outer layer, mainly made of Cr2O3). But if in the process fluid some corrosive...

First of all thank you for the replies. I know that Ni is extracted by a water gas containing C0 which at a temperature of about 50°C forms Ni(CO)4 , this complex at temperature above 250°C decompose again to Ni + 4CO. It possible that the same gas in contact with a nickel alloy at the above...

Does anyone know about corrosion problems of inconel alloys in CO/CO2 bearing gas (probable formation of nickel-tetra carbonyl)at temperature below 200°C. Sincerely MARCODEMARCO

Is commercially pure titanuim susceptible of severe general corrosion in a hot (90°C) hydrogen peroxide bearing (0.7M)solution ? Regards