JPH0336177B2 - - Google Patents
Info
- Publication number
- JPH0336177B2 JPH0336177B2 JP59024349A JP2434984A JPH0336177B2 JP H0336177 B2 JPH0336177 B2 JP H0336177B2 JP 59024349 A JP59024349 A JP 59024349A JP 2434984 A JP2434984 A JP 2434984A JP H0336177 B2 JPH0336177 B2 JP H0336177B2
- Authority
- JP
- Japan
- Prior art keywords
- corrosion
- humidity
- temperature
- low
- salt water
- 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 - Lifetime
Links
- 238000005260 corrosion Methods 0.000 claims description 48
- 230000007797 corrosion Effects 0.000 claims description 45
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 18
- 150000003839 salts Chemical class 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000010998 test method Methods 0.000 claims description 8
- 239000007769 metal material Substances 0.000 claims description 3
- 235000002639 sodium chloride Nutrition 0.000 description 20
- 238000000576 coating method Methods 0.000 description 18
- 239000011248 coating agent Substances 0.000 description 15
- 238000010586 diagram Methods 0.000 description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000010960 cold rolled steel Substances 0.000 description 4
- 238000007598 dipping method Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000004070 electrodeposition Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- 238000004381 surface treatment Methods 0.000 description 4
- 239000003973 paint Substances 0.000 description 3
- 239000003086 colorant Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Description
【発明の詳細な説明】
＜産業上の利用分野＞
本発明は、裸鋼板、塗装鋼板等の金属材料の腐
食現象を忠実に再現させるための腐食促進試験方
法に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an accelerated corrosion test method for faithfully reproducing the corrosion phenomenon of metal materials such as bare steel plates and painted steel plates.
＜従来技術＞
裸鋼板、塗装鋼板あるいは防錆皮膜を施した鋼
板等の自動車車体等に用いられる金属材料の腐食
促進方法としては、JISに規定されているような
塩水噴霧試験機を用い、高温高湿（温度35〜35
℃、湿度95〜100％）の腐食環境内で試験片に塩
水を連続的に噴露し、一定時間後に腐食形態（腐
食状況）及び腐食量を評価する方法がある。<Prior art> As a method for accelerating the corrosion of metal materials used in automobile bodies, such as bare steel plates, painted steel plates, and steel plates with anti-rust coating, high-temperature High humidity (temperature 35-35
There is a method in which salt water is continuously sprayed onto a test piece in a corrosive environment at a temperature of 95 to 100% humidity, and the corrosion form (corrosion status) and amount of corrosion are evaluated after a certain period of time.
また、特開昭56−126740号によつて、塩水噴
露、強制乾燥、塩水浸漬、自然乾燥を１サイクル
とし、これを一定時間繰返した後に腐食形態（腐
食状況）及び腐食量を評価する方法が提供されて
いる。 In addition, according to Japanese Patent Application Laid-open No. 126740/1984, a method is described in which one cycle consists of salt water spray, forced drying, salt water immersion, and natural drying, and after repeating this cycle for a certain period of time, the corrosion form (corrosion state) and corrosion amount are evaluated. is provided.
しかしながら、前者の方法では、その方法によ
る腐食形態と実車及び屋外暴露試験による腐食形
態とが異なり、忠実な腐食現象が再現されない。 However, in the former method, the corrosion form obtained by this method differs from the corrosion form obtained by actual vehicle and outdoor exposure tests, and faithful corrosion phenomena cannot be reproduced.
すなわち、実車及び屋外暴露試験では第１図で
示すように、塗膜１を施した鋼板２において、錆
３は傷口を覆つてしまうことはなく経時と共に腐
食が進行するが、前者の方法では、錆を促進させ
ることに主眼が置かれ、高温高湿の条件下で塩水
の供給が連続的に行われているため、Fe3O4の溶
出が多過ぎ、第２図で示すように錆３が傷口を覆
つてしまい、これにより、ある時点からはかえつ
て腐食の進行が抑制されてしまうからである。 In other words, in actual vehicle and outdoor exposure tests, as shown in Fig. 1, on the steel plate 2 coated with the coating film 1, the rust 3 does not cover the scratches and corrosion progresses over time, but in the former method, The main focus is on promoting rust, and as salt water is continuously supplied under high temperature and high humidity conditions, too much Fe 3 O 4 is eluted, resulting in rust 3 as shown in Figure 2. This is because the corrosion ends up covering the wound, and this actually suppresses the progress of corrosion after a certain point.
さらに、前者の方法では腐食量の順位相関がな
い。すなわち、第３図で示すように、実車及び屋
外暴露試験による普通鋼板Ａと防錆鋼板Ｂとの腐
食幅は当然普通鋼板Ａの方が大であることが示さ
れるが、前者の方法による場合は第４図で示すよ
うに防錆鋼板Ｂの方が悪い結果となつてしまう。
これは、前記のように高温高湿の条件下で塩水の
供給が連続的に行われているため、防錆鋼板の
Znの溶出が促進されることに起因しているもの
である。つまり、前者の方法は、例えば同一鋼板
に２種類の材料を塗装して、その材料間の耐食性
能を比較評価する場合などに使用しても問題はな
いが、実用環境で生じる腐食を予測評価するには
問題がある。 Furthermore, in the former method, there is no rank correlation in the amount of corrosion. In other words, as shown in Fig. 3, the corrosion width between ordinary steel plate A and anti-corrosion steel plate B in actual vehicle and outdoor exposure tests is naturally shown to be larger for ordinary steel plate A, but in the case of the former method. As shown in FIG. 4, the rust-proof steel plate B gives worse results.
This is due to the continuous supply of salt water under high temperature and high humidity conditions as mentioned above.
This is due to the promotion of Zn elution. In other words, the former method can be used, for example, when two types of materials are coated on the same steel plate and used to compare and evaluate the corrosion resistance performance of the two materials, but it is also used to predict corrosion that will occur in a practical environment. There is a problem in doing so.
この点、前記後者の方法（特開昭56−126740
号）では問題を解決しているが、１サイクル中に
塩水噴霧、強制乾燥、塩水浸漬、自然乾燥の４ス
テツプを必要としている。 In this respect, the latter method (Japanese Unexamined Patent Publication No. 56-126740
No. 1) solved the problem, but it required four steps in one cycle: salt water spray, forced drying, salt water immersion, and natural drying.
＜発明の目的＞
本発明の目的は、実用環境で生じる腐食の形態
を再現させることを最主視し、自然環境の腐食条
件を出来るだけシユミレートした試験条件を採用
することにより、精度の高い材料の寿命予測を可
能とすると共に試験工程を短縮し、上記従来の問
題点を解決した腐食促進試験方法を提供するもの
である。<Objective of the Invention> The object of the present invention is to develop materials with high accuracy by emphasizing the reproduction of corrosion forms that occur in a practical environment, and by adopting test conditions that simulate corrosion conditions in the natural environment as much as possible. The purpose of the present invention is to provide an accelerated corrosion test method that makes it possible to predict the service life of a steel, shorten the testing process, and solve the above-mentioned conventional problems.
＜発明の構成＞
本発明の特徴とする腐食促進試験方法は、所定
時間内で温度50〜70℃、湿度50〜70％の高温低湿
雰囲気と温度15〜20℃、湿度80〜100％の低温高
湿雰囲気とに分けて１サイクルとし、前記低温高
湿雰囲気で所定量の塩水を供給するものである。<Structure of the Invention> The accelerated corrosion test method that characterizes the present invention consists of testing a high-temperature, low-humidity atmosphere with a temperature of 50-70°C and a humidity of 50-70% and a low-temperature atmosphere with a temperature of 15-20°C and a humidity of 80-100% within a predetermined time. One cycle is divided into a high-humidity atmosphere and a high-humidity atmosphere, and a predetermined amount of salt water is supplied in the low-temperature and high-humidity atmosphere.
＜実施例＞ 以下本発明方法の実施例を説明する。<Example> Examples of the method of the present invention will be described below.
先ず、本発明方法の背景について説明すると、
実際の腐食環境条件を見極めるについて、腐食が
より促進すると考えられる海浜地区で夏期の１日
において、天候、風向、風速、気温、湿度、結露
時間、暴露板面温度、実車表面温度、海塩粒子量
の各項目の調査を行つた結果、次のことが把握さ
れた。 First, the background of the method of the present invention will be explained.
In order to determine the actual corrosive environment conditions, weather, wind direction, wind speed, temperature, humidity, dew condensation time, exposed board surface temperature, actual vehicle surface temperature, sea salt particles, sea salt particles, etc. were determined on a single day in the summer in a seaside area where corrosion is thought to be accelerated. As a result of investigating each item of quantity, the following was ascertained.
(1) 昼間：高温低湿である。(1) Daytime: High temperature and low humidity.
(2) 夜間：低温高湿である。(2) Nighttime: low temperature and high humidity.
(3) 夜間に実車表面に結露が生じ、その時間は約
12時間である。(3) Condensation forms on the surface of an actual vehicle at night and lasts for approximately
It is 12 hours.
(4) 実車表面温度は夜間においては淡、濃色の違
いに拘らず略同値を示すが、昼間は濃色の方が
最高温度で約20℃高い値を示す。(4) At night, the surface temperature of an actual vehicle is approximately the same regardless of the difference between light and dark colors, but during the day, the maximum temperature for dark colors is approximately 20°C higher.
(5) 海塩粒子は極く少量である。(5) Sea salt particles are in very small quantities.
そこで、本発明は特に上記(1)、(2)項を考慮し、
できる限り実環境に近似するような条件で試験方
法を設定したものである。 Therefore, the present invention particularly takes into consideration the above items (1) and (2),
The test method was set up under conditions that approximated the actual environment as much as possible.
その条件として、高温低湿では温度50〜70℃、
湿度50〜70％とし、低温高湿では温度15〜25℃、
湿度80〜100％とし、第５図で例示するように、
ある一定の時間内で高温低湿と低温高湿とに分け
て１サイクルとし、低温高湿時に供給量５〜20
mg／day／100cm2の塩水を供給したものである。 The conditions are a temperature of 50 to 70℃ with high temperature and low humidity.
The humidity should be 50-70%, and the temperature should be 15-25℃ at low temperature and high humidity.
The humidity is 80-100%, as illustrated in Figure 5.
One cycle is divided into high temperature, low humidity and low temperature, high humidity within a certain period of time, and the supply amount is 5 to 20 at low temperature and high humidity.
mg/day/100cm 2 of salt water was supplied.
そこで、上記高温低湿の役割は、塗膜下におけ
る腐食面積の拡大を図り、低温高湿の役割は塩水
を傷口より塗膜下に取入れることと、防錆鋼板で
はZnの溶出を制御する。また、塩水供給の役割
は、局部電池の形成に寄与し腐食を促進するもの
である。 Therefore, the role of the high temperature and low humidity is to expand the corrosion area under the paint film, and the role of the low temperature and high humidity is to introduce salt water under the paint film through the wound, and to control the elution of Zn in rust-proof steel sheets. In addition, the role of the salt water supply is to contribute to the formation of local batteries and promote corrosion.
ここで、塩水供給を低温低湿時に供給する塩水
供給のタイミングについては、海浜地区における
実際の環境条件下での風向と風速を見ると、高温
低湿時の昼間は海から陸に向つて風が吹き、風速
も４〜８ｍ／secとかなり強く、低温高湿時の夜
間は逆に陸から海へ向つて風が吹き風速も０〜
1.5ｍ／secと微風である。従つて、海塩粒子は昼
間の高温低湿時に大部分が供給されていることに
なり、本発明においても高温低湿時に塩水を供給
すればよい訳であるが、高温低湿時に供給した場
合、塩水が加温されて高湿となり、高温高湿とな
つて高温低湿の条件が保全されないため、低温高
湿時に供給し、高温低湿の条件を確保したもので
ある。 Regarding the timing of supplying salt water during times of low temperature and low humidity, looking at the wind direction and wind speed under actual environmental conditions in coastal areas, the wind blows from the sea toward the land during the daytime during high temperature and low humidity. The wind speed is quite strong at 4 to 8 m/sec, and at night when the temperature is low and high humidity, the wind blows from the land to the sea and the wind speed is 0 to 8 m/sec.
It was a light wind of 1.5m/sec. Therefore, most of the sea salt particles are supplied during the daytime during high temperature and low humidity, and in the present invention, it is sufficient to supply salt water during high temperature and low humidity, but if it is supplied during high temperature and low humidity, the salt water Because the temperature and humidity become high and the conditions of high temperature and low humidity cannot be maintained, it is supplied when the temperature is low and high humidity to ensure the high temperature and low humidity conditions.
また、塩水の供給量は、１サイクルの時間の長
短に関係なく１日（24時間）当りの総量が前記し
たように５〜20mg／day／100cm2の範囲内であれ
ばよく、例えば１サイクルの時間を２時間とした
場合、１サイクル中に供給される塩水量は約0.4
〜1.6mg／100m2であり、１サイクルの時間を12時
間とした場合には2.5〜10mg／100cm2の供給量とさ
れる。 In addition, the amount of salt water supplied may be within the range of 5 to 20 mg/day/100 cm 2 as described above, regardless of the length of one cycle. If the time is 2 hours, the amount of salt water supplied during one cycle is approximately 0.4
~1.6mg/ 100m2 , and when one cycle time is 12 hours, the supply amount is 2.5~10mg/ 100cm2 .
上記本発明方法と、前記したJISによる試験方
法並びに自然環境（屋外暴露試験）とによつて試
験した結果は第６〜８図に示す通りである。尚第
６〜８図中の記号の△、▲、○、●印は下記の塗
装系を示す。 The results of testing using the method of the present invention, the JIS test method described above, and the natural environment (outdoor exposure test) are shown in FIGS. 6-8. The symbols △, ▲, ◯, and ● in Figures 6 to 8 indicate the following coating systems.
△：冷延鋼板−デイツピング表面処理−アニオン
電着塗装−中塗塗装−上塗塗装
▲：冷延鋼板−デイツピング表面処理−カチオン
電着塗装−中塗塗装−上塗塗装
○：防錆鋼板−デイツピング表面処理−アニオン
電着塗装−中塗塗装−上塗塗装
●：防錆鋼板−デイツピング表面処理−カチオン
電着塗装−中塗塗装−上塗塗装
第７図のJISによる試験方法では、冷延鋼板塗
装板の方が防錆鋼板塗装板よりも優れた防錆力
（腐食巾が小さい）を示す。これに対し、第８図
の自然環境では防錆鋼板塗装板の方が冷延鋼板塗
装板より大巾に優れた防錆力を有している。そし
て、第６図に示す本発明は第８図の自然環境と相
関のとれた腐食状態となる。また、腐食の形態に
ついても、本発明の試験による冷延鋼板塗装板の
腐食は、塗膜が盛り上り、その下に錆が堆積する
第１図による自然環境の腐食形態と類似したもの
となつた。△: Cold rolled steel plate - Dipping surface treatment - Anionic electrodeposition coating - Intermediate coating - Top coating ▲: Cold rolled steel plate - Dipping surface treatment - Cationic electrodeposition coating - Intermediate coating - Top coating ○: Rust-proof steel plate - Dipping surface treatment - Anionic electrodeposition coating - Intermediate coating - Top coating ●: Rust-preventing steel plate - Dipping surface treatment - Cationic electrodeposition coating - Intermediate coating - Top coating Shows superior rust prevention (smaller corrosion width) than painted steel sheets. On the other hand, in the natural environment shown in FIG. 8, the anti-corrosion steel coated plate has a much better anti-corrosion ability than the cold-rolled steel coated plate. The present invention shown in FIG. 6 has a corrosion state that correlates well with the natural environment shown in FIG. 8. In addition, regarding the form of corrosion, the corrosion of painted cold-rolled steel sheets in the tests of the present invention is similar to the corrosion form in the natural environment as shown in Figure 1, where the paint film swells up and rust accumulates underneath. Ta.
＜発明の効果＞
以上のように本発明によると、自然環境と同様
な条件の腐食環境が得られ、腐食形態が実車及び
屋外暴露試験に近似し、腐食量の順位相関がと
れ、その結果、各種防錆対策での精度の高い材料
の寿命予測及び腐食のメカニズム検討に有効であ
ると共に、高温低湿−低温高湿の２条件サイクル
であるために試験工程が短縮できる利点を有して
いる。<Effects of the Invention> As described above, according to the present invention, a corrosive environment with conditions similar to those in the natural environment can be obtained, the corrosion form is similar to that of the actual vehicle and outdoor exposure test, and the rank correlation of the amount of corrosion can be established. It is effective in predicting the lifespan of materials with high precision in various rust prevention measures and examining corrosion mechanisms, and has the advantage of shortening the testing process because it is a two-condition cycle of high temperature, low humidity and low temperature, high humidity.
第１図は実車及び屋外暴露試験の腐食形態を示
す図、第２図は従来の促進試験方法の腐食形態を
示す図、第３図は実車及び屋外暴露試験による腐
食巾を示す図、第４図は従来の促進試験方法によ
る腐食巾を示す図、第５図は本発明方法の一実施
例を示す１サイクル図、第６図は本発明方法によ
り各種塗装系の鋼板の腐食巾を示す図、第７図は
従来の促進試験方法（JIS）による各種塗装系の
鋼板の腐食巾を示す図、第８図は自然環境による
各種塗装系の鋼板の腐食巾を示す図である。
Figure 1 is a diagram showing the corrosion form in the actual vehicle and outdoor exposure test, Figure 2 is a diagram showing the corrosion morphology in the conventional accelerated test method, Figure 3 is a diagram showing the corrosion width in the actual vehicle and outdoor exposure test, and Figure 4 is a diagram showing the corrosion width in the actual vehicle and outdoor exposure test. Figure 5 is a diagram showing the extent of corrosion by the conventional accelerated test method, Figure 5 is a cycle diagram showing an example of the method of the present invention, and Figure 6 is a diagram showing the extent of corrosion of steel plates coated with various coatings by the method of the present invention. , FIG. 7 is a diagram showing the extent of corrosion of steel plates with various coatings according to the conventional accelerated testing method (JIS), and FIG. 8 is a diagram showing the extent of corrosion of steel plates with various coatings in the natural environment.
Claims (1)
めの腐食促進試験方法であつて、所定時間内で温
度50〜70℃、湿度５〜70％の高温低湿雰囲気と温
度15〜20℃、湿度80〜100％の低温高湿雰囲気と
に分けて１サイクルとし、前記低温高湿雰囲気で
所定量の塩水を供給することを特徴とする腐食促
進試験方法。1 This is an accelerated corrosion test method for reproducing the corrosion phenomenon of metal materials such as steel plates, in which a high temperature, low humidity atmosphere of 50 to 70°C and humidity of 5 to 70% and a high temperature and low humidity atmosphere of 15 to 20°C and humidity of 80% are used for a specified period of time. A method for accelerated corrosion testing, characterized in that one cycle is divided into a low temperature and high humidity atmosphere of ~100%, and a predetermined amount of salt water is supplied in the low temperature and high humidity atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2434984A JPS60169739A (en) | 1984-02-14 | 1984-02-14 | Corrosion accelerating test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2434984A JPS60169739A (en) | 1984-02-14 | 1984-02-14 | Corrosion accelerating test method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60169739A JPS60169739A (en) | 1985-09-03 |
| JPH0336177B2 true JPH0336177B2 (en) | 1991-05-30 |
Family
ID=12135714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2434984A Granted JPS60169739A (en) | 1984-02-14 | 1984-02-14 | Corrosion accelerating test method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60169739A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5624896A (en) * | 1979-08-06 | 1981-03-10 | Nec Corp | Multipartite telephone set calling system |
| JPS56163440A (en) * | 1981-05-06 | 1981-12-16 | Shigeru Suga | Heating method of test room in corrosion test device |
-
1984
- 1984-02-14 JP JP2434984A patent/JPS60169739A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5624896A (en) * | 1979-08-06 | 1981-03-10 | Nec Corp | Multipartite telephone set calling system |
| JPS56163440A (en) * | 1981-05-06 | 1981-12-16 | Shigeru Suga | Heating method of test room in corrosion test device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60169739A (en) | 1985-09-03 |
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