JPS6038479B2 - housing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a saddle body made of a steel plate having a chromium coating layer on its surface.

In place of tin, steel sheets coated with chromium by electrolytic chromic acid treatment, that is, so-called TFS, are used in large quantities as materials for canning crabs, which require corrosion resistance.

TFS has good paint adhesion, making it an excellent steel plate for paint hammers, and its beautiful appearance makes it suitable for transparent lacquer painting.

However, the conventional TFS coating has poor hot water resistance, and can be used as a hot pack, that is, when the contents are
For use in fruit juice beverages that require heat sterilization to a temperature of 100°F and immediate filling, or retort sterilization, that is, high-temperature heat sterilization of filled coins with pressurized steam, Not suitable.

When hot pack or retort sterilization is performed using conventional TFS paint, the aging resistance of paint adhesion decreases.
Within a short period of time, defects such as peeling of paint or tearing of the shell are likely to occur. Therefore, an object of the present invention is to provide a fin body made of a chromium-coated steel plate that has excellent paint adhesion, hot water resistance, and aging resistance. Another object of the present invention is to provide a chromium-coated steel sheet suitable for use in rice bran, particularly TFS coated rice bran for hot packs and retort sterilization.

The object of the present invention is to contain 0.01 to 0 in the chromium coating layer.
．． In the fin body made of a steel plate having a chromium coating layer containing sulfur content, the steel plate is heat-treated, and in the sulfur content, the fin body is made of a steel plate having a chromium coating layer containing sulfur content. This is achieved by using the chromium-coated steel plate of the present invention, which has a sulfur content of 65% or less.

Chromium-coated steel sheets are obtained by electrolytically treating steel sheets in an electrolytic bath containing chromic acid and sulfuric acid as essential components.
Usually, in the resulting chromium coating layer, 0.01 to 0.25
In conventional chromium-coated steel sheets, most of the sulfur content is soluble.

A feature of the key body of the present invention is that the soluble sulfur content contained in the chromium coating layer of the chromium-coated steel plate forming the key body is 65% or less, preferably 60% or less of the total sulfur content.

Soluble sulfur content is defined as the sulfur content that dissolves at a temperature of 95°C, using sulfur prepared by the method described in Electrochemistry 37, 1969, p. 514, as a standard sample. It is measured by the line analysis method as follows.

The total sulfur content (ra) in the sample chromium-coated steel sheet is measured using crab light X-rays.

Next, the sample chromium-coated steel plate was heated to a temperature of 95 oo
After soaking in a OH aqueous solution for 5 minutes, washing with water and drying,
Measure the amount of sulfur (1,) in the sample using crab light X-rays.

Furthermore, the surface coating is scraped off with emery vapor, and the amount of sulfur (12) in the obtained material is measured using crab light X-rays.

From the above measurement values, the amount of soluble sulfur in the chromium coating is determined as lo-1, and the amount of total sulfur in the chromium coating is determined as L-12, which is the percentage of soluble sulfur to the total sulfur in the coating. is shearing sheep.

It is determined by

The chromium coating layer consists of a metallic chromium layer and a chromium oxide layer, and the thickness of the metallic chromium layer is usually 9/d of 0.2 to 3.
The thickness of the chromium oxide layer is preferably 9/d of 0.3 to 1.5, and the thickness of the chromium oxide layer is usually 9/d of 0.06 to 0.5 as the amount of chromium.
/d, preferably 0.08 to 0.3 degrees 9/d.

The chromium oxide layer may optionally consist of a crystalline chromium oxide layer and an amorphous chromium hydrate layer. The chromium-coated steel plate used in the key body of the present invention can be manufactured by various methods, some of which will be exemplified below, but the method is not limited to these exemplified methods.

{1} Chromic anhydride 10-100 minutes/so, sulfuric acid 0.0
In an aqueous solution containing 1 to 1% of the base material, the surface potential of the steel plate is -1.0V to -1 with respect to the saturated calomel electrode.
．． After electrolyzing at 1V, the steel plate was electrolessly immersed in the same plating bath for 1 to 1 intervals of sand, then immersed for 1 to 1 interval of sand in water at 70 to 90°C, and further immersed at 150 to 3000C for 0. It can be manufactured by holding for 1 to 15 minutes.

[2- Chromic anhydride 10-100 ta' and sulfuric acid 0.0
Immediately after electrolysis, the surface potential of the steel plate is 1.1 V or less with respect to a saturated calomel electrode in an aqueous bath containing 1 to 1 V as the main component. Electrolysis is performed at 0.5V to -1.1V.

Next, the steel plate is electrolessly immersed in the same plating bath for 1 to 1 inkstone grains, then soaked in 70 to 90 qo of water for 1 to 1 g of sand, and then further soaked in 150 to 30 qo of water for 0.1 to 15 minutes. It can also be manufactured by holding.

'3- Chromic anhydride 10-100 t/t, sulfuric acid 0.0
For 1 to 1 night, the surface potential of the steel plate in an aqueous bath containing it as a main ingredient was -0.5 V to -1.
Immediately after electrolysis at 1 V, electrolysis is carried out at -1.1 V or less with respect to a calomel electrode with a saturated surface potential of the steel plate.

Next, the steel plate is electrolessly immersed in the same plating bath for 1 to 1 intervals of sand, then immersed in 70 to 90o water for 1 to 10 seconds, and further held at 150 to 300 for 0.1 to 15 minutes. It can be manufactured by

The treatment of dipping the steel plate in water at 70 to 90° C. for 1 to 1 times between sands may also serve as washing after plating.

Further, the heat treatment of holding the steel plate at 150 to 300 qo for 0.1 to 15 minutes may be performed after painting the steel plate and at the same time as baking the paint.

When the body of the present invention is used as a coating key for hot packs or retort sterilization, it has remarkable characteristics in that it has excellent paint adhesion, hot water resistance, and aging resistance. Beer can also be suitably used.

Alternatively, the cluster may be unpainted. The following examples specifically explain the effects of the present invention.

Tests were conducted in the following manner throughout each example.

1. Real ant storage test For each test item, a sample plate is finally molded, and the molded moth 1 female crab (with contents) is stored for one year and then evaluated according to the following test items.

[1} Dissolved iron: Dissolved iron (9)/beverage (1000 tar
) Perforation: Number of perforations that occurred within one year of storage (8 perforations: Peeling occurred at the side seam of side lap seam cement) [3] Flavor: Panel ( Results of the flavor test conducted by 10 testers: 5: Excellent 4: Good 3:
Fair 2: Poor 1: Poor '4} Discoloration: Change in the color of the beverage (silver color, bleaching, browning, etc.)
Inner surface condition of the bonito: Visual evaluation of the inner surface of the bonito after opening (state of rust, change in coating film, etc.) 2 Characteristics test of material steel plate '1} Beer test: Painted 0.23 skin cicada sample plate Heat and press the two pieces together with adhesive.

This was soaked in a 0.4% citric acid aqueous solution and heated at 5000 for 3 months. After washing with water and drying, perform T beer using a tensile tester and measure the strength at that time. This test evaluates paint adhesion after adhesion. {2} Elixene+
Salt water mist test: Elixene: Extended salt water mist test: Salt water mist test according to JISZ-2371, floor mist time: 1 instant rs, Evaluation: Excellent depending on the degree of rust {5) ← → Poor {1) This The paint adhesion and corrosion resistance of the coated sample plate after processing are evaluated by the test.

3 Retort test A side-lap seam cement can crab is used as a sample for the retort test.

The total number of samples is 10 each, and the contents are filled under normal filling conditions, sealed, retorted under specified conditions, and evaluated by the number of cans that break 8 times.

Examples 1 to 10 Manufacture of chromium-coated steel sheets Using the methods described above (1), The electroless soaking time, the soaking time in 7,000 ml of water, and the heat treatment conditions were changed as shown in Table 1, and sample chromium-coated steel sheets were prepared using a lead-tin (5%) alloy as the anode.

Sulfur content in the chromium coating layer and in the sulfur content, 9500
Table 1 shows the ratio of sulfur content soluble in NaOH and the amount of chromium based on the temperature of the rail, and Table 2 shows the results of the characteristic tests of the obtained coated steel sheets.

Examples 1, 2, 3, 6 and 7.

The coated steel plate was prepared by the method of {1}, and the method of Examples 4 and 5 was {2}.
Examples 8, 9, and 10 were produced by the method [3]. Manufacture of beard body Each of the above-mentioned key board materials was used to make rice cake by the following method.

Various chrome-coated steel plate blanks (125 ribs x 210 ribs)
Apply epoxy-phenol paint to both sides, 210q
C: One powder was dried and hardened.

The twill portions at both ends along the 125-rib direction of this blank are approximately 24
Heat to 0qo and melt-bond a nylon adhesive tape to one side of the green part of one edge of the blank, melt-bond the adhesive tape to one side of the other edge, and also bond the cut surface of the blank. was covered and protected with adhesive. Next, this blank was formed into a cylindrical shape with a height of 125 pieces using a rice milling machine, and the twilled portions on both ends with adhesive were formed into a cylinder shape with a height of about 240 mm.
The edges, which are protected from cutting with adhesive, are placed on top of each other so that they become the inner surface of the foundation, and the adhesive is bonded together.
1 Tire side lap seam key molded.

The self-overlapping width of the tsuba body was 5 yanagi.

Next, this beard trunk is flanged, the canopy is double-sealed, and a modified vinyl chloride/vinyl acetate copolymer paint is applied and dried.
This was used as a sample key body. The above-mentioned sample bonito bodies were filled with various contents, double-sealed with dovetail lids, and then subjected to an actual sewing storage test.

The results are shown in Table 2. Examples 11 to 20 Using the chromium-coated steel plates prepared in the above examples, fin bodies were made using various bonito production methods, and these sample fin bodies were subjected to real bonito storage tests in the same manner as in Examples 1 to 10. I did it.

The results are shown in Table 3. Examples 11 to 13 are deep-drawn wires, and epoxy phenol paint layer was provided on the inner surface of the wire.
01 tire 150 is a definite object.

Example 14 15 is a squeeze moth, and 211 tire 35 is provided with an epoxy-urea resin paint layer on the inner surface and a vinyl chloride/vinyl acetate copolymer layer on the surface.
It is a 0M bonito body.

Example 1017 is a welding plate, in which an epoxy paint layer was provided on the welded part of the beard body, and a vinyl chloride paint layer was further provided.
One tire has 350 pieces of key body.

Examples 1 & 19 are complete hook seams, the hook seam portions are joined with a thermosetting adhesive, and the inner surface of the cage is coated with an epoxy-phenol paint layer. Example 20 is a 5-gallon square cassock, the hook seam part and the cassette cap cord part are joined with a thermoplastic adhesive, and the inner surface of the coin is a key body provided with a layer of epoxy phenolic paint. Yoshiyukize Miyuki without Sokyukyu.

Badness S conduit oath Total) Fuyuzo Karasuza 9 cicadas in Z l￥&rope Z selection bonito Phantom gallbladder column 'False monument tracing P-rutted bonito Town Ura Q Field Nogumi “Yamanin x Koboi 0 Young battle R Kaoromizo Mikumo [N Nosu ＊＊＊＊

Claims (1)

[Claims] 1 0.01 to 0.25 mg/dm in the chromium coating layer
In the case made of a steel plate having a chromium coating layer containing a sulfur content of ^2, the steel plate is heat-treated,
A case made of a chromium-coated layered plate, characterized in that the proportion of sulfur soluble in 6N-NaOH at a temperature of 95° C. in the sulfur content is 65% or less.