Abstract
Whisker growth was observed on hot dip galvanised (HDG) zinc and blue
chromated bright zinc plate. passivated with blue chrome passivate. For HDG,
whisker growth predominated on dull areas, where grain size was small and
compressive stresses were present. In electroplating, brighteners produce
small crystals and shiny surfaces. SEM analysis showed the presence of
chlorine and sulphur. In areas of whisker growth, the chlorine peak was
stronger than that of sulphur. Small zinc crystals and surface corrosion by
chlorides favour whisker growth. Sulphur is related to filament growth.
Although the conditions necessary to produce whiskers are similar on HDG
and plated zinc, the filaments themselves differ. On plated zinc, they are
smooth and consist of pure zinc. HDG filaments are rough and contain iron
and thus are brittle and prone to breakage.
chromated bright zinc plate. passivated with blue chrome passivate. For HDG,
whisker growth predominated on dull areas, where grain size was small and
compressive stresses were present. In electroplating, brighteners produce
small crystals and shiny surfaces. SEM analysis showed the presence of
chlorine and sulphur. In areas of whisker growth, the chlorine peak was
stronger than that of sulphur. Small zinc crystals and surface corrosion by
chlorides favour whisker growth. Sulphur is related to filament growth.
Although the conditions necessary to produce whiskers are similar on HDG
and plated zinc, the filaments themselves differ. On plated zinc, they are
smooth and consist of pure zinc. HDG filaments are rough and contain iron
and thus are brittle and prone to breakage.
| Original language | English |
|---|---|
| Title of host publication | SUR/FIN 2006 Technical Conference |
| Subtitle of host publication | Track III: Zinc and Zinc Alloys |
| Publisher | American Electroplaters and Surface Finishers Society (AESF) |
| Pages | 280-292 |
| Publication status | Published - 2006 |
| MoE publication type | A4 Article in a conference publication |
| Event | SUR/FIN 2006 Technical Conference - Milwaukee, United States Duration: 18 Sept 2006 → 21 Sept 2006 |
Conference
| Conference | SUR/FIN 2006 Technical Conference |
|---|---|
| Country/Territory | United States |
| City | Milwaukee |
| Period | 18/09/06 → 21/09/06 |