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Steel post having corrosion control property for embedded part

a technology of corrosion control and embedded parts, which is applied in the field of lamp posts, can solve the problems of easy corrosion of parts right above where the posts are embedded, and achieve the effect of prolonging the life of materials

Inactive Publication Date: 2006-05-18
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] An object of the present invention is to provide a steel post superior in controllability of corrosion at the embedded part even when used by dogs etc. to mark their territories.
[0010] (2) A steel post having corrosion controllability of an embedded part comprising a steel post having a zinc-based plating corrosion-proofing material superior in durability against an aqueous solution containing ammonium ions along the outside of the steel post to at least 50 mm up to the atmosphere side and down to the embedded material side at a top end of an interface where the steel post and material embedded in contact each other.
[0013] By using the steel post according to the present invention, the problem of corrosion at the embedded part, in particular corrosion due to marking of territories by dogs, can be solved and collapse of poles endangering pedestrians or blocking traffic can be avoided. Further, the lifetime of the materials can be lengthened, the replacement intervals of lamp posts etc. can be lengthened, and the costs of maintaining roads, parks, etc. can be reduced.

Problems solved by technology

However, even if these parts are prevented from corrosion, it is known that the parts right above where the posts are embedded are easily corroded (47th Zairyo-to-Kankyo Conference Preprints, 195 (2000)).
In this way, it has been pointed out that the frequently used steel posts are used by dogs to mark their territories and sometimes collapse due to the corrosion resulting from this.

Method used

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  • Steel post having corrosion control property for embedded part
  • Steel post having corrosion control property for embedded part

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] The test sample shown in FIG. 2 was fabricated. The test sample 5 (steel post) had an outside diameter of 60.5 mm, a length of 200 mm, and a thickness of 3.8 mm. The test sample 5 was given the corrosion-proofing coating shown in Table 2 in advance and further covered with the metal-based corrosion-proofing material shown in Table 2. The sample was embedded in concrete 6 of a diameter of 100 mm to about half of its 200 mm length direction. Further, a 20 mm high PVC frame 7 was placed over the concrete. This was filled with an embedded material 8 comprised of a mixture of commercially available gardening use soil and decomposing leaves etc. The test sample was sprayed once a day with an aqueous solution of substantially the same ingredients as average canine urine shown in Table 1. After six months, the state of corrosion was evaluated by viewing the occurrence of corrosion and any pitting. The tested materials and their test results are shown in Table 2. The steel post accord...

example 2

[0030] Under the conditions prescribed in JIS H 8641, steel pipes of outside diameters of 43 mmφ, lengths of 100 mm, and thicknesses of 3.5 mm plated with zinc were brush coated on their outside surfaces with the ordinary temperature curing epoxy resin coatings comprised of a solution containing 49 wt % of an epoxy resin varnish, 30 wt % of a bulk pigment (titanium oxide), about 2 wt % of other additives, and 6 wt % of a solvent and polymerizing by 13 wt % of a curing agent into which the pigments shown in Table 3 were added in the wt % with respect to the coatings shown so as to thereby form coating layers comprised of corrosion-proofing materials. At this time, for measurement of the ability of each of the pigments to neutralize ammonium, 100 g of an aqueous solution containing 5% ammonium ions was prepared, the pigment described in the table was added in a powder state in an amount of 1%, and the amount when the pH fell to 1 or more was deemed as the ability to neutralize ammoniu...

example 3

[0032] Steel pipes of inside diameters of 150 mmφ, thicknesses of 6 mm, and lengths of 3 m were zinc plated by the method prescribed in JIS H8641 and covered by the corrosion-proofing material of the specification 1 shown in Example 1 to a range of 500 mm from a location 500 mm from the bottom end of the surface, covered by the corrosion-proofing material of the specification 7 of Example 1, or covered by the corrosion-proofing material of the specification 26 of Example 2 and, as a comparative example, a steel pipe not covered by an corrosion-proofing material were prepared. These steel pipes were embedded in concrete so that locations 750 mm from the bottom ends were exposed at the concrete surface. Soil was covered over the top of these to a thickness of 50 mm to obtain test samples.

[0033] These test samples were sprayed once a day with solutions of the ingredients shown in Table 1. These were examined after the elapse of one year, whereupon it was found that the comparative mat...

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Abstract

A steel post superior in corrosion controllability of its embedded part even when marked for territory by dogs, that is, a steel post having corrosion controllability of an embedded part comprising a steel post having a corrosion-proofing coating or a zinc-based plating corrosion-proofing material which is provided with a coating layer comprised of a corrosion-proofing material superior in durability against an aqueous solution containing ammonium ions along the outside of the steel post to at least 50 mm up to the atmosphere side and down to the embedded material side at a top end of an interface where the steel post and material embedded in contact each other.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a lamp post, a sign post, chain link fence pole, or other steel post used with a bottom part embedded outdoors, more particularly technology for preventing corrosion of embedded parts of these steel posts. [0003] 2. Description of the Related Art [0004] Lamp posts, sign posts, etc. are fabricated from various types of materials, but steel materials are made particularly frequent use of in view of the balance of strength and price. These are often used with bottom parts embedded outdoors. At this time, the steel materials are prevented from being corroded by some sort of method, for example, by the method of zinc plating or coating. These corrosion prevention methods are designed to protect the up to several meters of above-ground parts by shielding the steel materials from rain, wind, condensation, and other corrosive factors. [0005] However, even if these parts are prevented from co...

Claims

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Application Information

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IPC IPC(8): E04C3/30E04B1/64E04H12/22
CPCB05D7/14B05D2350/65B32B1/08B32B13/06B32B13/12B32B15/08B32B15/18B32B2255/06B32B2255/205B32B2255/26B32B2255/28B32B2307/714B32B2590/00B32B2597/00C09D5/082E04H12/2292
Inventor YAMAMOTOYAMANAKA, SHINTARO
Owner NIPPON STEEL CORP
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