JPS6254392B2 - - Google Patents
Info
- Publication number
- JPS6254392B2 JPS6254392B2 JP59165401A JP16540184A JPS6254392B2 JP S6254392 B2 JPS6254392 B2 JP S6254392B2 JP 59165401 A JP59165401 A JP 59165401A JP 16540184 A JP16540184 A JP 16540184A JP S6254392 B2 JPS6254392 B2 JP S6254392B2
- Authority
- JP
- Japan
- Prior art keywords
- corrosion
- stainless steel
- less
- silica
- silicic acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 238000005260 corrosion Methods 0.000 claims description 10
- 230000007797 corrosion Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 229960004029 silicic acid Drugs 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000007769 metal material Substances 0.000 description 5
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 5
- 235000012239 silicon dioxide Nutrition 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- LRCFXGAMWKDGLA-UHFFFAOYSA-N dioxosilane;hydrate Chemical compound O.O=[Si]=O LRCFXGAMWKDGLA-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 229960001866 silicon dioxide Drugs 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Analysing Materials By The Use Of Radiation (AREA)
- Chemical Treatment Of Metals (AREA)
Description
〔発明の利用分野〕
本発明はシリカ製造に用いる装置構造用金属材
料に係り、詳しくは含水ケイ酸の製造装置を構成
する例えば反応槽、その他槽、配管、ポンプ等の
材料としてすぐれた耐食性を発揮する金属材料に
関する。
〔発明の背景〕
一般に、含水ケイ酸の製造は、アルカリ性ケイ
酸ナトリウム溶液と硫酸との反応によつて行なわ
れ、含水ケイ酸においては、上記反応により生成
する含水ケイ酸の懸濁液を過、水洗、乾燥、粉
砕、分級して製造される。
ここで含水珪酸とは、合成ゴムの補強充填剤、
農薬のキヤリヤ、塗料・接着剤の増粘剤、紙の充
填剤・コーテイング剤、等々に用いられる沈澱珪
酸、乾燥剤、吸着剤その他に用いられるシリカゲ
ル、等々のものをいう。
茲に於て特に反応工程では、例えばU.S.
P.3235331公報、特公昭39−1207号公報に見られ
る如く、反応温度が90℃前後のかなりの高温であ
ること、或は原料ケイ石中に含有されるフツ素や
硫黄等の不純物による腐食性が大きい為、反応槽
や、これに続く工程各槽等の材料選定に苦慮され
ているのが現状である。
例えば槽構造材料の内面に、耐食性良好な樹
脂、たとえばフツ素系樹脂をコーテイングやライ
ニングすることによつて対処できるとしても、こ
の方法では高温であるばかりでなく、工事施行上
の因難性、あるいは反応時に発生するスケール除
去の際の破損などの問題がある。したがつてかか
るコーテイング等が不要な耐食性の優れた金属材
料の採用が望まれていた。
〔発明の目的と概要〕
本発明はこのような現状の下でシリカ製造に好
適に用いられる金属材料を提供するためになされ
たものである。
以下本発明について詳細に説明する。本発明者
等は、まず一般的なステンレス鋼を対象として電
気化学的並びに浸漬腐食の基礎試験を行なつた。
対象試料は、オーステナイト系ステンレス鋼４
種Ａ〜Ｄ、オーステナイト−フエライト二相系ス
テンレス鋼１種Ｅ、および本発明の高Crフエラ
イト系ステンレス鋼４種Ｆ、Ｇ、Ｈ、Ｉとした。
供試鋼の化学成分は次記表１の通りである。
[Field of Application of the Invention] The present invention relates to a metal material for the structure of equipment used in the production of silica, and more specifically, it is a metal material that has excellent corrosion resistance and is used as a material for reactors, other tanks, piping, pumps, etc. that constitute the equipment for producing hydrated silica. Concerning metal materials that exhibit excellent performance. [Background of the Invention] Hydrous silicic acid is generally produced by reacting an alkaline sodium silicate solution with sulfuric acid. It is manufactured by washing, drying, crushing, and classifying. Here, hydrated silicic acid is a reinforcing filler for synthetic rubber,
It refers to precipitated silicic acid used as carriers for agricultural chemicals, thickeners for paints and adhesives, fillers and coating agents for paper, etc., and silica gel used as desiccants, adsorbents, etc. Especially in the reaction process, for example, US
As seen in Publication P.3235331 and Japanese Patent Publication No. 39-1207, the reaction temperature is quite high, around 90℃, or corrosion is caused by impurities such as fluorine and sulfur contained in the raw silica stone. Due to the large nature of this process, it is currently difficult to select materials for the reaction tank and subsequent process tanks. For example, even if this could be done by coating or lining the inner surface of the tank structural material with a resin with good corrosion resistance, such as a fluorine-based resin, this method would not only result in high temperatures, but would also pose problems during construction. Alternatively, there are problems such as breakage during scale removal during reaction. Therefore, it has been desired to use a metal material with excellent corrosion resistance that does not require such a coating. [Objective and Summary of the Invention] The present invention has been made in order to provide a metal material that can be suitably used for producing silica under these current circumstances. The present invention will be explained in detail below. The present inventors first conducted basic electrochemical and immersion corrosion tests on common stainless steel. The target sample is austenitic stainless steel 4
Types A to D, austenite-ferrite duplex stainless steel type 1 E, and high Cr ferritic stainless steel types 4 of the present invention F, G, H, and I.
The chemical composition of the test steel is shown in Table 1 below.
本発明範囲に属する供試鋼片（試料Ｇ：組成は
表１参照）を、沈澱珪酸製造装置の反応槽内に設
置し、６カ月間のシユミレーシヨンテストを行な
つた。
その結果は、供試鋼片の表面にほとんど腐食は
観察されず、単に液面付近が僅かに薄黒色を呈す
るのみであつた。
A test piece of steel (Sample G: see Table 1 for composition) falling within the scope of the present invention was placed in a reaction tank of a precipitated silicic acid manufacturing apparatus, and a simulation test was conducted for 6 months. As a result, almost no corrosion was observed on the surface of the sample steel piece, and only a slight black color was observed near the liquid surface.
第１図は温度90℃、微量の含水珪酸を含むPH
2.4の約50ｇ／Na2SO4溶液中における各種ステ
ンレス鋼の自然電極電位の経時変化であり、第２
図は同溶液中で浸漬腐食試験を行なつたときの、
腐食速度と経過日数との関係を示す曲線である。
Figure 1 shows the temperature at 90℃ and the pH containing a trace amount of hydrated silicic acid.
2.4 is the change over time in the natural electrode potential of various stainless steels in about 50 g/Na 2 SO 4 solution, and the second
The figure shows the results of an immersion corrosion test in the same solution.
This is a curve showing the relationship between corrosion rate and elapsed days.
Claims (1)
含み、残部Fe及び不可避的不純物の高Crフエラ
イト系ステンレス鋼からなるシリカ製造装置用耐
食材料。 ２ 少なくともCr26.0〜35.0％、C0.02％以下及
びMo5.0％以下を含み、残部Fe及び不可避的不純
物の高Crフエライト系ステンレス鋼からなるシ
リカ製造装置用耐食材料。[Scope of Claims] 1. A corrosion-resistant material for silica production equipment comprising a high Cr ferritic stainless steel containing at least 26.0 to 35.0% Cr, 0.02% or less of C, and the balance being Fe and unavoidable impurities. 2. Corrosion-resistant material for silica production equipment made of high Cr ferritic stainless steel containing at least 26.0 to 35.0% Cr, 0.02% or less of C, and 5.0% or less of Mo, with the balance being Fe and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16540184A JPS6144160A (en) | 1984-08-07 | 1984-08-07 | Corrosion resistant material for silica manufacturing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16540184A JPS6144160A (en) | 1984-08-07 | 1984-08-07 | Corrosion resistant material for silica manufacturing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6144160A JPS6144160A (en) | 1986-03-03 |
| JPS6254392B2 true JPS6254392B2 (en) | 1987-11-14 |
Family
ID=15811704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16540184A Granted JPS6144160A (en) | 1984-08-07 | 1984-08-07 | Corrosion resistant material for silica manufacturing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6144160A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01229197A (en) * | 1988-02-08 | 1989-09-12 | Franz Jansen | Device for repairing buried pipe |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2624671A (en) * | 1951-01-19 | 1953-01-06 | Union Carbide & Carbon Corp | Ferritic chromium steels |
| JPS5128597A (en) * | 1974-09-03 | 1976-03-10 | Tokico Ltd | KUROMUSANIONOGANJUSURU SUISEIEKITAIKARA KUROMUSANOKAISHUSURU HOHO |
| JPS5424964A (en) * | 1977-07-26 | 1979-02-24 | Kimitsu Kagaku Kenkyusho | Preparation of stamping material |
-
1984
- 1984-08-07 JP JP16540184A patent/JPS6144160A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2624671A (en) * | 1951-01-19 | 1953-01-06 | Union Carbide & Carbon Corp | Ferritic chromium steels |
| JPS5128597A (en) * | 1974-09-03 | 1976-03-10 | Tokico Ltd | KUROMUSANIONOGANJUSURU SUISEIEKITAIKARA KUROMUSANOKAISHUSURU HOHO |
| JPS5424964A (en) * | 1977-07-26 | 1979-02-24 | Kimitsu Kagaku Kenkyusho | Preparation of stamping material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01229197A (en) * | 1988-02-08 | 1989-09-12 | Franz Jansen | Device for repairing buried pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6144160A (en) | 1986-03-03 |
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