KR20170055620A - Adhesion Enhancing Agent with Anti-rust Additive Property for the Purpose of arc thermal spraying method - Google Patents

Abstract

The present invention provides a rust-preventive adhesion enhancer. The protective build-up enhancer includes a rust inhibitor and a roughening agent.

Description

{Adhesion Enhancing Agent with Anti-rust Additive Property for the Purpose of Arc Thermal Spraying Method for Anticorrosion Effect of Steel Surface and Adhesion of Thermal Spray by Arcing Method}

The present invention relates to a rust-preventive adhesion enhancer for preventing corrosion of a steel surface and securing adhesion of a thermal sprayed coating by an arc spraying method.

In the field application of arc spraying method which is a method of steel construction method, the surface treatment of steel for forming adhesion between sprayed coating and steel is carried out as the first step of blast treatment. However, depending on the occurrence of delays in the construction schedule (for example, when the humidity in the atmosphere is high or when it is raining, it is impossible to carry out the spraying process), the blasted steel sheet may not be applied immediately after the blast treatment. Due to external factors such as moisture in the atmosphere, it may cause deterioration of the adhesion of the sprayed coating. Therefore, when the blasted steel surface can not be sprayed immediately, it is necessary to delay the occurrence of corrosion by applying a rust preventive agent. In order to form a smooth coating film by applying a rust preventive agent, the surface of the steel must have a surface roughness Roughness, 75um or more) may not be obtained. This may also be a problem causing deterioration of the adhesion strength of the thermal spray coating.

Accordingly, in the present invention, a rust-preventive adhesion enhancer capable of securing the roughness of the surface of a steel material and exhibiting an anti-corrosive effect has been developed. In order to ensure the adhesion of the sprayed coating above the reference quality, the appropriate blending ratios of the oil based adhesion enhancer and the oily system-based rustproofing agent are selected, thereby enhancing the work efficiency of the spraying construction by securing the rust prevention performance of the steel surface.

A technical problem to be solved by the present invention is to provide a highly reliable rust-preventive adhesion enhancer.

Another object of the present invention is to provide a rust-preventive adhesion enhancer having a rust-preventive effect while securing the surface roughness of a steel material.

Another technical problem to be solved by the present invention is to provide a rust-preventive adhesion enhancer capable of improving the work efficiency of spraying.

The technical problem to be solved by the present invention is not limited to the above.

In order to solve the above technical problems, the present invention provides a rust-preventive adhesion enhancer for antirust effect on the surface of a steel material and securing adhesion of a thermal spray film by arc spraying.

The rust-preventive adhesion enhancer according to an embodiment of the present invention includes a rust inhibitor and an illumination agent, wherein the rust-inhibitor ratio may be 5 to 20%.

The rust-preventive adhesion enhancer according to the embodiment of the present invention ensures the roughness of the surface of the steel material and has an excellent rust-inhibiting effect. As a result, the efficiency of the spraying work improves, and the adhesion between the sprayed coating and the surface of the steel can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a photograph of a process for producing a rust-inhibitive adhesion enhancer according to an embodiment of the present invention.
FIG. 2 is a result of measuring the surface state of the unpainted steel sheet according to the comparative example of the present invention.
Fig. 3 shows the result of measurement of the surface state of a test body coated with a conventional antirust agent according to a comparative example of the present invention.
FIG. 4 is a result of measurement of the surface state of a specimen coated with a conventional roughing agent according to a comparative example of the present invention.
FIG. 5 is a result of measuring the surface state of a test body coated with a rust-preventive adhesion enhancer according to the first embodiment of the present invention.
6 is a result of measurement of the surface state of a specimen coated with a rust-preventive adhesion enhancer according to the second embodiment of the present invention.
7 is a result of measurement of the surface state of a specimen coated with a rust-preventive adhesion enhancer according to the third embodiment of the present invention.
FIG. 8 is a result of measurement of surface condition of a test body coated with a rust-preventive adhesion enhancer according to the fourth embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical spirit of the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

In this specification, when an element is referred to as being on another element, it may be directly formed on another element, or a third element may be interposed therebetween. Further, in the drawings, the thicknesses of the films and regions are exaggerated for an effective explanation of the technical content.

Also, while the terms first, second, third, etc. in the various embodiments of the present disclosure are used to describe various components, these components should not be limited by these terms. These terms have only been used to distinguish one component from another. Thus, what is referred to as a first component in any one embodiment may be referred to as a second component in another embodiment. Each embodiment described and exemplified herein also includes its complementary embodiment. Also, in this specification, 'and / or' are used to include at least one of the front and rear components.

The singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It is also to be understood that the terms such as " comprises "or" having "are intended to specify the presence of stated features, integers, Should not be understood to exclude the presence or addition of one or more other elements, elements, or combinations thereof. Also, in this specification, the term "connection " is used to include both indirectly connecting and directly connecting a plurality of components.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The present invention relates to a coating agent for pretreatment of steel surface to be applied in the arc metal spraying method which is a method of steel material development, and a rust-preventive adhesion enhancer for securing the surface rusting effect after the blast treatment of the steel surface for spray coating and securing adhesion between steel and spray coating . It is a feature of the present invention that a rust-preventive agent and a roughening agent are mixed and applied in an appropriate ratio to simultaneously secure a rust-preventive effect and an adhesion-increasing effect with one application.

In the case of the present invention, it is intended to be applied as one of the process steps of the arc metal spraying method, and can be applied to all fields of construction finishing of civil / civil structure using steel. Typical examples are bridges, steel structures, large-capacity metal tanks, and radio transmission / reception towers. In the case of the present invention, since it is an adhesion enhancer having anticorrosive properties, it can be utilized also in the case of applying a spray coating method in addition to the arc spraying method.

In the case of arc spraying, blasting or grinding is performed by pretreatment of the surface of the steel before application. Accordingly, in the prior art, when the coating operation can not be carried out immediately after the pretreatment, about 5% of the weight ratio of the thinner is used as a rust inhibitor to suppress the surface of the steel material. On the other hand, in the arc spraying method, coating of a roughening agent is required as a part of the process in order to form an adhesive force between the steel and the sprayed coating. This is because the surface roughness of the steel is difficult to adhere to the thermal spray coating, so that the surface roughness of the steel is further improved by applying the rough surface forming agent to adhere the thermal spray coating.

The problems of rust inhibitor and roughening agent are limited when they are used as a single coating agent, respectively. In the case of rust inhibitor, it can be largely divided into an aqueous system and an oily system. In the case of a water-based rust inhibitor, the rust-preventive agent can not be combined with the rust- As a result, there is a disadvantage in that it is difficult to adsorb the roughening agent in an appropriate amount or more on the surface of the rust-inhibited steel material, thereby making it difficult to secure the adhesion of the sprayed coating. In the case of the oil based antirust agent, if the mixing ratio of the rust-preventive agent to the thinner is high or the coating thickness is large, a smooth coating film is formed instead of being adsorbed on the surface of the steel material, and the surface roughness of the steel material due to the blast treatment is lost. (If the surface of the steel shows luster even after drying after applying the rust preventive, this means that the rust preventive is not absorbed on the surface of the steel but forms a coating film and can be visually confirmed.) This is because even if the rust- There is a limit that can not be secured. In the case of the roughening agent, it is a coating agent mixed with an appropriate ratio of silica and silica to the epoxy-based material. Since the material is not rust-inhibitive, when the time passes after the application of the roughening agent to the surface of the steel material, It is difficult to secure the adhesion of the coating film.

In order to solve the limitations of prior art rust inhibitors and roughening agents, the present invention has developed an adhesion enhancer and a vapor-proof rust inhibitor which have similar performance to those of conventional roughing agents, So that it can be used as an integral coating agent. This aims to increase the construction efficiency of the arc metal spraying work because it can secure both the rust prevention effect of the steel material and the adhesion force of the sprayed coating and can exhibit the rust prevention performance for a long time.

Table 1 describes the experiment contents for verifying the performance evaluation of the rust-preventive adhesion enhancer. For the test specimen, the SS41 steel sheet of 150 x 70 mm size was blasted. For the test environment, the specimen was placed in a high temperature and high humidity chamber at a temperature of 30 ° C and a humidity of 90%, and the surface photograph was taken through an optical microscope at intervals of 0 hours, 24 hours, 48 hours, 72 hours and 96 hours. In the case of surface photographing, three points were photographed for each specimen in order to ensure reliability.

number Specimen name Steel surface treatment and application method Mixing ratio (weight ratio) of vapor- One Unpainted steel plate Only blast processing - 2 Existing anti-corrosion agent Apply only anti-rust agent after blasting - 3 Conventional lighting formers After blasting, - 4 Antirust Adhesion Enhancer 5% Incorporation of vapor-resistant rust inhibitor as a weight ratio to the adhesion enhancer after blast 5% 5 Antirust Adhesion Enhancer 10% 10% 6 Antirust Adhesion Enhancer 15% 15% 7 Anticorrosive Adhesion Enhancer 20% 20% Remarks Specification: 150X70mm SS41 steel plate; Degradation environment of test specimen: temperature 30 degrees, humidity 90%; Use of arc spray Metal wire: Zn-Al 1.6mm; Degradation time: 0H, 24H, 48H, 72H, 96H

As a factor for comparing the anti - corrosive effect of the rust - preventive adhesion enhancer, a blast - treated steel plate without coating, a steel plate coated with only rust inhibitor, and a steel plate coated with a roughening agent alone were prepared. In the case of the rust-preventive adhesion enhancer, the weight of the adhesion enhancer was fixed, and the ratios of the rust inhibitor were set to 5%, 10%, 15% and 20%, respectively. In the case of the mixing ratio, considering the ease of use in actual construction, the viscosity of the coating enhancer is not high when the adhesion enhancer is mixed with the vapor corrosion inhibitor. Figure 1 shows the experimental procedure.

2 shows the surface measurement results of the unpainted steel sheet. As a result of the evaluation, it can be seen that the blackness and the redness appear as much as 24 hours after the deterioration. It can be seen that the amount of red rust is continuously increasing with deterioration time, and after 96 hours of deterioration, it is confirmed that the area near half of the surface of the test body is covered with red rust. This means that it is necessary to apply antirusting agent within 24 hours for the blast-treated steel sheet.

Fig. 3 shows the surface measurement results of the test piece coated with the existing rust inhibitor alone. As a result of evaluation, after 24 hours and 48 hours after the deterioration, it is seen that the corrosion progressed in the form of a point, but the rust is maintained as a whole. However, after 72 hours of deterioration, visible redness was observed, and after 96 hours, it was confirmed that the size of redness was considerably large. This means that even when the anticorrosive agent is applied to the steel, it is not completely covered on the surface but a part that is not rust-proofed is generated. Red rust generated from such rust-inhibited portions has a limitation in that the area becomes wider as time elapses, leading to peeling of the coating film.

Fig. 4 shows the results of surface measurement of the specimen coated with the conventional roughing agent alone. The red material on the steel represents the roughening agent, and it can be seen that large and small roughening agent particles partially cover the steel rather than cover the entire steel. Thus, the difference in height between the steel material and the roughening agent makes it possible to adhere the coating to form a surface roughness. As a result of the evaluation, it can be confirmed that the yellow coating spreads from the periphery of the steel surface within 24 hours of deterioration. As a result, it can be seen that the roughening agent does not exhibit the rust prevention effect of the steel material at all. It can be seen that the area of red rust is continuously increasing with the deterioration time, and after 96 hours of deterioration, the red rust near the surface of the steel is generated and spread.

Figs. 5 to 8 show evaluation results of a specimen in which a rust-preventive adhesion enhancer is applied according to the incorporation ratio. As a result of evaluating the application condition according to the mixing ratio, it can be confirmed that as the mixing amount of the vapor-resistant rust inhibitor increases, the particle size becomes spherical and gradually increases. This is because the combination of the vapor-proof rust inhibitor and the adhesion enhancer leads to the formation of a viscous bond. Comparing with the particle size distribution of the test body shown in FIG. 4, it was confirmed that the distribution degree was similar when the mixing ratio of the rust preventive agent was applied up to 20%. When the mixing amount is more than 20%, it is confirmed that these particle grains are increased and the surface roughness can not be maintained at an appropriate level.

As a result of the evaluation, it can be seen that within the range of the mixing ratio of 5 to 20%, no redness occurs on the surface even after the deterioration time reaches 96 hours. It is considered that unlike the case of the single application of the rust inhibitor and the single application of the roughening agent, the rust prevention effect is maintained by covering the surface of the steel material more densely due to the combination of the vapor corrosion inhibitor and the adhesion enhancer. That is, the limit of the existing coating agent is integrated and the limitation is compensated. The adhesion is also expected to be similar to that of the conventional coating agent alone.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the invention.

Claims (2)

Rust preventives and
A rust-preventive adhesion enhancer comprising a roughening agent.
The method according to claim 1,
Wherein the ratio of the rust inhibitor is 5 to 20%.

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