Pit propagation of nickel and nickel molybdenum alloys
Creators
- 1. Univ. of Alberta, Edmonton, Alberta (Canada). Dept. of Chemical and Materials Engineering
- 2. McMaster Univ., Hamilton, Ontario (Canada). Brockhouse Inst. for Materials Research
Description
Pit development on nickel and nickel-molybdenum alloys in 0.1 M NaCl + 0.05 M Na2SO4 solution under potentiostatic conditions was studied. When the molybdenum content of nickel-molybdenum alloys is above a threshold value, it has the effect of reducing the current flowing from the surface. Examination by scanning electron microscopy shows the presence of two distinct pit morphologies: terraced faceted pit surfaces resulting from crystallographic dissolution is observed on nickel, while shallow pits with smooth surfaces are formed on Ni-5Mo because of the presence of a salt film at the pit bottom. The experimental results were analyzed according to a model for pit growth. The results quantitatively correlate the conductivity of the pit electrolyte and the conductivity and thickness of the salt film with the dissolution of metal within a pit
Additional details
Publishing Information
- Journal Title
- Journal of the Electrochemical Society
- Journal Volume
- 144
- Journal Issue
- 11
- Journal Page Range
- p. 3907-3912.
- ISSN
- 0013-4651
- CODEN
- JESOAN
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 29021505
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- CORROSIVE EFFECTS; DISSOLUTION; MOLYBDENUM ALLOYS; MORPHOLOGY; NICKEL; NICKEL BASE ALLOYS; PITTING CORROSION; SODIUM CHLORIDES; SODIUM SULFATES
- Descriptors DEC
- ALKALI METAL COMPOUNDS; ALLOYS; CHEMICAL REACTIONS; CHLORIDES; CHLORINE COMPOUNDS; CORROSION; ELEMENTS; HALIDES; HALOGEN COMPOUNDS; METALS; NICKEL ALLOYS; OXYGEN COMPOUNDS; SODIUM COMPOUNDS; SULFATES; SULFUR COMPOUNDS; TRANSITION ELEMENT ALLOYS; TRANSITION ELEMENTS