|
|
SURFACE CONTAMINATION
-
Clean steel surfaces are an essential requirement for good hot dip galvanizing.
Contamination in the form of grease, tar, paint and weld slag cannot be
removed by chemical cleaning and may result in black bare spots after
hot dip galvanizing. Specifiers should ensure that the fabricator takes
responsibility for articles being delivered free from
contamination.
Steel sections, which have been cut or drilled using suds type oil can give similar problems to burnt or anti-spatter sprays. The cutting fluid, which has been burnt or baked onto the steel, should be removed prior to sending the steelwork for galvanizing.
Contamination is sometimes difficult to detect on the steel surface and
will only show up after the galvanizing treatment. The article may then
have t be regalvanized, at additional cost.
|
|
|
