Zaili, Mohd Azlan Mohd
(2006)
Investigations on the Restorations of Erased
Engraved Marks on Steel Surfaces.
Other.
Universiti Sains Malaysia.
(Submitted)
Abstract
Restoration of erased engraved marks is considered difficult compared to the
restoration of stamped marks, as the deformation occurring to the metal due to the
engraving is minimal. Hence a series of experiments was designed to test the sensitivity
and efficacy of different metallographic reagents that are traditionally used on steel
surfaces to reveal erased stamped marks.
The experiments consisted of preparing several steel plates with engraving marks
and erasing these engravings marks to different levels down to the depth of engraving.
Then some selected reagents were used on them using swabbing technique to restore the
erased engraved marks. The results have shown that the reagents of Sg cupric sulphate
(CuS04), 60 ml hydrochloric acid (HCl), 30 ml concentrated ammonium solution
(NH30H), 60 ml water and also Sg cupric chloride (CuC}z), 50 ml hydrochloric acid
(HCl), 30 ml water (H20) are quite sensitive and effective in the recovery process of
erased engraved marks.
It is also noted during these experiments that the disturbance caused to the steel
surfaces occurring to original engraving has penetrated just through 0.04 mm below the
bottom of the engraved marks.
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