Premium
SCRATCH BLISTERS, II
Author(s) -
Zapffe C. A.,
Yarne J. L.
Publication year - 1942
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1942.tb14198.x
Subject(s) - blisters , scratch , materials science , pickling , composite material , oxide , hydrogen , coating , metallurgy , chemistry , organic chemistry
The enamel defect known as “scratch blisters” is consistently found to be caused by hydrogen that is introduced in large quantities at scratch marks. Several independent phenomena may contribute this hydrogen. An electrochemical reaction between iron and its oxide scale during pickling increases the hydrogen absorption at the scratch sufficiently to lead regularly to scratch blisters when steel with a certain type of oxide coating is used. Galvanic nickel coatings aggravate scratch blistering in a manner that is not well understood. Surface impurities and mechanical effects may produce scratch blisters but only circumstantially. The rolling direction of the sheet is found to be related to the occurrence of scratch blisters.