Abstract
This article is devoted to the study of the possibility of the passivation of iron-based metallic materials. The experimental results obtained for the laser treatment of carbon steel model samples by the radiation of repetitively pulsed and continuous-wave 1.064 µm Nd:YAG lasers are described. It is shown that the laser treatment allows the formation of dense protection films, 62–77 microns thick, on the steel surface. The films enhance the anticorrosion properties of the metal. Exposure to laser radiation reduces the surface roughness (from Ra = 0.53 µm to Ra = 0.38 µm). Laser radiation power densities of 10.2 × 105 W/cm2 and 10.7 × 105 W/cm2 for these two laser generating modes, respectively, correspond to the optimum (in terms of the degree of corrosion resistance) modes of steel treatment. The conducted studies show that the application of Nd: YAG lasers is a promising method for the surface passivation of artworks created from steel and cast iron. One of the most promising applications of the proposed method for the anticorrosion protection of iron is the passivation of the surface of iron-based historical monuments.
Highlights
One of the most important practical tasks in modern museum work is the passivation of the surface of cultural heritage (CH) objects made of iron, steel, and cast iron
In order to test the technology involved in the laser passivation of historical monuIn order to test the technology involved in the laser passivation of historical monuments made of iron, small carbon steel plates were selected as the model samples
Nd:YAG lasers are described in the present article
Summary
One of the most important practical tasks in modern museum work is the passivation of the surface of cultural heritage (CH) objects made of iron, steel, and cast iron. In the conservation of such objects, restorers frequently have to deal with the removal of corrosion products This is a very difficult task in itself, since the corrosion layer thickness of many monuments (primarily archaeological objects) can be significant (up to 1 cm). This problem is aggravated by the fact that the reoccurring formation of the foci of corrosion on the surface of such objects is possible after the completion of the restoration process. This puts the task of developing effective technologies for creating inhibitory (protective) coatings on the surface of monuments on the agenda. Wax and various types of lacquers are used as inhibitors in the conservation of CH objects; but in recent years special protective materials have emerged, including those made of inorganic materials [1]
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