Coatings comprising polysilazanes for preventing scaling and corrosion
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A polysilazane and coating technology, applied in the field of polysilazane-based coatings, can solve the problems of consumption, large materials, high roasting temperature, etc.
Inactive Publication Date: 2009-03-18
CLARIANT INT LTD
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Problems solved by technology
Disadvantages include the use of toxic lead compounds, high firing temperatures, inherent color (opaque), and the resulting protective coating can only be used temporarily
Moreover, this protective coating is between 100 and 200 μm thick and thus consumes a large amount of material
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Embodiment 1
[0038] V2A sheets (steel 1.4301, X5 CrNi 1810 / Cr 18%, Ni 10%, Si 1%, Mn 2%, P 0.045%, S 0.03%, C<0.07%, the rest is Fe) for coating. After drying at room temperature (about 30 min), the coated sheets were stored in air in an oven to 1000° C. for 1 h, the rate of heating and cooling was 3 K / min.
[0039] The oxidation test can be repeated several times without observed fouling of the steel.
Embodiment 2
[0041] V2A sheets (steel 1.4301, X5 CrNi 18 10 / Cr 18% , Ni 10%, Si 1%, Mn 2%, P 0.045%, S 0.03%, C<0.07%, and the rest is Fe) for coating. After drying at room temperature (approximately 30 min), the coated sheets were stored in air in an oven to 1000° C. for 10 h, with a heating and cooling rate of 5 K / min.
[0042] The oxidation test can be repeated several times without observed fouling of the steel.
Embodiment 3
[0044] V2A sheets (steel 1.4301, X5Cr Ni 18 10 / Cr 18%, Ni 10%, Si 1%, Mn 2%, P 0.045%, S 0.03%, C<0.07%, and the rest is Fe) for coating. After drying at room temperature (about 30 min), the coated sheets were stored in air in an oven to 1000° C. for 10 h, the rate of heating and cooling was 3 K / min.
[0045] The oxidation test can be repeated several times without observed fouling of the steel.
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Abstract
A coating for surfaces, comprises at least one polysilazane of the formula 1 and/or of the formula 2 where n is an integer and is dimensioned such that the perhydropolysilazane has a number average molecular weight of 150 to 150 000 g/mol, a solvent and catalyst and, if appropriate, one or more cobinders, for preventing scaling and corrosion on metal surfaces. The hardened coating has a thickness of at least 0.2 - 10 micrometres, preferably 0.3 to 5 micrometres. It is particularly useful as a protective coating for metals for preventing scaling and corrosion.
Description
technical field [0001] The present invention relates to polysilazane-based coatings for the preparation of protective coatings for preventing fouling and controlling corrosion on metal surfaces at high temperatures. Background technique [0002] Due to the heat treatment necessary for tempering or annealing of the components, steel components are simultaneously produced and / or processed in the region of about 900° C. to 1250° C., through metal surface oxidation and associated discoloration. The scale formed - an oxidation product of iron - has to be removed again, which is costly and inconvenient. [0003] Work on protective coatings for scale inhibition on steel and other metals is therefore carried out at an early stage. [0004] For example, DE 1803022 describes a ceramic protective coating which resists scale and delaminates on cooling due to its different coefficient of thermal expansion than steel and thus provides temporary protection. Disadvantages include the use ...
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