TWI786339B - Anti-corrosion method for metal components of cooling water system - Google Patents
Anti-corrosion method for metal components of cooling water system Download PDFInfo
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- TWI786339B TWI786339B TW108138305A TW108138305A TWI786339B TW I786339 B TWI786339 B TW I786339B TW 108138305 A TW108138305 A TW 108138305A TW 108138305 A TW108138305 A TW 108138305A TW I786339 B TWI786339 B TW I786339B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/12—Oxygen-containing compounds
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Abstract
一種冷卻水系統的金屬構件的防蝕方法,具有:步驟(1),向冷卻水系統內添加選自酒石酸及酒石酸鹽的一種以上的化合物(A)使其與金屬構件接觸;以及步驟(2),在所述步驟(1)之後,向所述冷卻水系統內添加選自鋅及鋅鹽的一種以上的化合物(B)使其與所述金屬構件接觸。A method for preventing corrosion of metal components in a cooling water system, comprising: step (1), adding more than one compound (A) selected from tartaric acid and tartrates into the cooling water system to make it contact with the metal components; and step (2) , after the step (1), adding at least one compound (B) selected from zinc and zinc salts into the cooling water system to make it contact with the metal member.
Description
本發明是有關於一種對冷卻水系統中構成與冷卻水接觸的部分的金屬構件的表面形成防蝕皮膜進行防蝕的、冷卻水系統的金屬構件的防蝕方法。The present invention relates to a method for preventing corrosion of metal components in a cooling water system by forming an anti-corrosion film on the surface of a metal component that forms a portion in contact with cooling water in the cooling water system.
在建築物或地域設施等的空調設備、及機械設備(plant)等中,為了對各種流體進行間接冷卻,而使用有水冷式的熱交換器。在此種冷卻水系統中的熱交換器或其周邊的配管等的各種構件中一般使用有碳鋼或不鏽鋼等金屬。 該些金屬構件若總是或斷續地與冷卻水接觸,則因水中的溶氧而容易腐蝕。若因腐蝕,配管等的金屬構件發生厚度減少或孔蝕,則亦有時會導致設備的損傷或機械設備中製品的污染,進而有引起重大事故之虞。A water-cooled heat exchanger is used for indirect cooling of various fluids in air-conditioning equipment such as buildings and regional facilities, and mechanical equipment (plants). Metals such as carbon steel and stainless steel are generally used for various members such as heat exchangers and piping around them in such cooling water systems. If these metal components are always or intermittently in contact with cooling water, they are easily corroded by dissolved oxygen in the water. If the thickness of metal components such as piping is reduced or pitted due to corrosion, it may cause damage to equipment or contamination of products in machinery and equipment, which may cause serious accidents.
作為此種金屬構件的防蝕方法,例如在專利文獻1中提出有藉由在冷卻水系統的啟動時的基礎處理中,使用磷酸系及鋅系防蝕劑,而在金屬構件表面形成牢固的防蝕皮膜。
[現有技術文獻]
[專利文獻]As an anticorrosion method for such metal members, for example,
[專利文獻1]日本專利特開2011-202243號公報[Patent Document 1] Japanese Patent Laid-Open No. 2011-202243
[發明所欲解決之課題] 然而,近年來,由於對環境保護的關心提高或排水限制加強,要求削減排水中的磷等的含量。未設置排水處理設備的機械設備等難以應對此種要求,亦有時不得不中止磷酸系及鋅系防蝕劑的使用。 而且,磷酸系防蝕劑是藉由沈澱皮膜來形成防蝕皮膜,所以在所述基礎處理中需要4天左右的長時間。因此,亦期望縮短基礎處理期間。[Problem to be Solved by the Invention] However, in recent years, due to increased interest in environmental protection and stricter regulations on drainage, it has been required to reduce the content of phosphorus and the like in wastewater. It is difficult for machinery and equipment not equipped with wastewater treatment equipment to meet such requirements, and the use of phosphoric acid-based and zinc-based corrosion inhibitors may have to be discontinued. In addition, since the phosphoric acid-based anticorrosion agent forms an anticorrosion film by depositing a film, it takes a long time of about 4 days for the basic treatment. Therefore, shortening of the base processing period is also desired.
因此,尋求一種不使用磷酸系防蝕劑而可以更短的時間獲得優異的防蝕效果的防蝕方法。Therefore, a corrosion protection method capable of obtaining an excellent corrosion protection effect in a shorter period of time without using a phosphoric acid-based corrosion inhibitor has been sought.
本發明是為了解決所述課題而成,目的在於提供一種不使用磷酸系防蝕劑,而可以更短的處理時間對冷卻水系統的金屬構件表面賦予優異的防蝕效果的、冷卻水系統的金屬構件的防蝕方法。The present invention is made to solve the above problems, and an object of the present invention is to provide a metal member of a cooling water system that can provide an excellent anti-corrosion effect on the surface of a metal member of a cooling water system in a shorter treatment time without using a phosphoric acid-based corrosion inhibitor. anti-corrosion method.
[解決課題之手段] 本發明是基於如下發現:藉由使用酒石酸系化合物,進而應用鋅系化合物,會對冷卻水系統的金屬構件帶來良好的防蝕效果。[Means to solve the problem] The present invention is based on the following discovery: by using tartaric acid-based compounds and further applying zinc-based compounds, a good anti-corrosion effect can be brought to the metal components of the cooling water system.
即,本發明提供以下的[1]~[8]。 [1]一種冷卻水系統的金屬構件的防蝕方法,具有:步驟(1),向冷卻水系統內添加選自酒石酸及酒石酸鹽的一種以上的化合物(A)使其與金屬構件接觸;以及步驟(2),在所述步驟(1)之後,向所述冷卻水系統內添加選自鋅及鋅鹽的一種以上的化合物(B)使其與所述金屬構件接觸。 [2]如所述[1]所述的冷卻水系統的金屬構件的防蝕方法,其中,在所述步驟(1)中,向所述冷卻水系統內,添加以酒石酸換算量計30 mg/L~100 mg/L的濃度的所述化合物(A)。 [3]如所述[1]或[2]所述的冷卻水系統的金屬構件的防蝕方法,其中所述步驟(1)中的冷卻水系統的pH為6.0~8.0。 [4]如所述[1]至[3]中任一項所述的冷卻水系統的金屬構件的防蝕方法,其中,在所述步驟(1)中,所述金屬構件與所述化合物(A)的接觸時間為20小時~30小時。 [5]如所述[1]至[4]中任一項所述的冷卻水系統的金屬構件的防蝕方法,其中,在所述步驟(2)中,向所述冷卻水系統內,添加以鋅換算量計1 mg/L~50 mg/L的濃度的所述化合物(B)。 [6]如所述[1]至[5]中任一項所述的冷卻水系統的金屬構件的防蝕方法,其中,在所述步驟(2)中,所述金屬構件與所述化合物(B)的接觸時間為20小時~30小時。 [7]如所述[1]至[6]中任一項所述的冷卻水系統的金屬構件的防蝕方法,其中,所述冷卻水系統為循環冷卻水系統。 [8]如所述[1]至[7]中任一項所述的冷卻水系統的金屬構件的防蝕方法,其中,所述步驟(1)及步驟(2)是在所述冷卻水系統的基礎處理中進行。That is, the present invention provides the following [1] to [8]. [1] A method for preventing corrosion of metal components in a cooling water system, comprising: step (1), adding one or more compounds (A) selected from tartaric acid and tartrates to the cooling water system to contact the metal components; and (2) After the step (1), adding at least one compound (B) selected from zinc and zinc salts into the cooling water system to make it contact with the metal member. [2] The method for preventing corrosion of metal components in the cooling water system according to [1], wherein, in the step (1), adding 30 mg/ The compound (A) at a concentration of L to 100 mg/L. [3] The method for preventing corrosion of metal components in a cooling water system according to [1] or [2], wherein the pH of the cooling water system in the step (1) is 6.0 to 8.0. [4] The method for preventing corrosion of metal components of a cooling water system according to any one of [1] to [3], wherein, in the step (1), the metal component and the compound ( The contact time of A) is 20 hours - 30 hours. [5] The method for preventing corrosion of metal components of the cooling water system according to any one of [1] to [4], wherein, in the step (2), adding The compound (B) at a concentration of 1 mg/L to 50 mg/L in terms of zinc conversion. [6] The method for preventing corrosion of metal components of a cooling water system according to any one of [1] to [5], wherein, in the step (2), the metal component and the compound ( The contact time of B) is 20 hours - 30 hours. [7] The method for preventing corrosion of metal components in a cooling water system according to any one of [1] to [6], wherein the cooling water system is a circulating cooling water system. [8] The method for preventing corrosion of metal components in the cooling water system according to any one of [1] to [7], wherein the steps (1) and (2) are performed in the cooling water system in the basic processing.
[發明的效果] 根據本發明,不使用磷酸系防蝕劑,便可以更短的處理時間對冷卻水系統的金屬構件表面賦予優異的防蝕效果。因此,本發明的防蝕方法在應對環境保護的同時可有助於冷卻水系統的冷卻能力的維持。[Effect of the invention] According to the present invention, an excellent anticorrosion effect can be imparted to the surface of a metal member in a cooling water system in a shorter treatment time without using a phosphoric acid-based anticorrosion agent. Therefore, the anti-corrosion method of the present invention can contribute to the maintenance of the cooling capacity of the cooling water system while dealing with environmental protection.
以下,針對本發明進行詳細的說明。Hereinafter, the present invention will be described in detail.
本發明的冷卻水系統的金屬構件的防蝕方法具有:步驟(1),向冷卻水系統內添加選自酒石酸及酒石酸鹽的一種以上的化合物(A)使其與金屬構件接觸;以及步驟(2),在所述步驟(1)之後,向所述冷卻水系統內添加選自鋅及鋅鹽的一種以上的化合物(B)使其與所述金屬構件接觸。 如此,在本發明的防蝕方法中,作為防蝕劑,使用酒石酸系化合物(A)後,使用鋅系化合物(B)。所述酒石酸系化合物具有抑制所述金屬構件表面中的陽極反應的效果。而且,所述鋅系化合物具有抑制所述金屬構件表面中的陰極反應的效果。根據本發明的防蝕方法,可藉由兩者的協同效果,對所述金屬構件賦予優異的防蝕效果。The anti-corrosion method of the metal components of the cooling water system of the present invention has: step (1), adding more than one compound (A) selected from tartaric acid and tartrate in the cooling water system to make it contact with the metal components; and step (2) ), after the step (1), adding at least one compound (B) selected from zinc and zinc salts into the cooling water system to make it contact with the metal member. Thus, in the anticorrosion method of this invention, after using a tartaric acid type compound (A) as an anticorrosion agent, a zinc type compound (B) is used. The tartaric acid-based compound has an effect of suppressing anodic reaction in the surface of the metal member. Furthermore, the zinc-based compound has an effect of suppressing a cathodic reaction in the surface of the metal member. According to the anticorrosion method of the present invention, an excellent anticorrosion effect can be imparted to the metal member due to the synergistic effect of both.
(冷卻水系統) 本發明中的冷卻水系統是指建築物或地域設施等的空調設備、及機械設備等中,通水用於熱交換器的運轉的冷卻水的系統。 所述冷卻水系統可為貫流式、開放循環式或密閉循環式中的任一種。本發明在循環冷卻水系統,特別是開放循環冷卻水系統中可發揮優異的防蝕效果。(cooling water system) The cooling water system in the present invention refers to a system through which cooling water is passed for operation of heat exchangers in air-conditioning equipment such as buildings and regional facilities, and mechanical equipment. The cooling water system can be any one of cross-flow type, open circulation type or closed circulation type. The invention can exert excellent anti-corrosion effect in the circulating cooling water system, especially in the open circulating cooling water system.
本發明在所述冷卻水系統中,能夠在啟動時或穩定運轉時等任一狀態下應用,特別是較佳為在初次啟動或再次運轉等的啟動時的基礎處理中應用。
冷卻水系統啟動時,系統內容易大量存在腐蝕產物,而容易消耗防蝕劑,因此通常以穩定運轉時的3~10倍的使用濃度來添加防蝕劑,進行用於獲得充分的防蝕效果的防蝕處理。將此種冷卻水系統的啟動時的防蝕處理稱為基礎處理,亦有時稱為初期處理。
本發明的防蝕方法在此種基礎處理中可揮發優異的防蝕效果。In the cooling water system, the present invention can be applied in any state such as start-up or steady operation, and is particularly preferably applied to basic treatment at start-up such as initial start-up or re-operation.
When the cooling water system is started, there are likely to be a large amount of corrosion products in the system, and it is easy to consume the corrosion inhibitor. Therefore, the corrosion inhibitor is usually added at a
所述冷卻水系統只要為一般性的冷卻水系統的水質,便可充分地發揮藉由本發明的防蝕方法帶來的防蝕效果。較佳的pH為6.0~8.0,更佳為6.0~7.5,進而佳為6.5~7.5。 而且,較佳的鈣硬度為30 mgCaCO3 /L~150 mgCaCO3 /L,更佳為30 mgCaCO3 /L~120 mgCaCO3 /L,進而佳為30 mgCaCO3 /L~100 mgCaCO3 /L。 而且,較佳的離子狀二氧化矽濃度為5 mgSiO2 /L~35 mgSiO2 /L,更佳為10 mgSiO2 /L~30 mgSiO2 /L,進而佳為15 mgSiO2 /L~25 mgSiO2 /L。As long as the cooling water system is of general cooling water system water quality, the anti-corrosion effect brought by the anti-corrosion method of the present invention can be fully exerted. Preferable pH is 6.0-8.0, more preferably 6.0-7.5, still more preferably 6.5-7.5. Moreover, the preferred calcium hardness is 30 mgCaCO 3 /L-150 mgCaCO 3 /L, more preferably 30 mgCaCO 3 /L-120 mgCaCO 3 /L, and still more preferably 30 mgCaCO 3 /L-100 mgCaCO 3 /L. Moreover, the preferred concentration of ionic silicon dioxide is 5 mgSiO 2 /L to 35 mgSiO 2 /L, more preferably 10 mgSiO 2 /L to 30 mgSiO 2 /L, further preferably 15 mgSiO 2 /L to 25 mgSiO 2 /L.
(金屬構件) 所述金屬構件是構成所述冷卻水系統的與冷卻水接觸的部分的金屬構件。作為所述金屬構件,例如對象為熱交換器或冷凍機、各種配管或閥等中的金屬製的部分。 作為應用本發明的金屬,較佳為鐵系,例如在鍋爐/熱交換器用碳鋼鋼管(STB鋼管)等中,可獲得優異的防蝕效果。(metal components) The metal member is a metal member constituting a portion of the cooling water system that is in contact with cooling water. Examples of the metal member include metal parts in heat exchangers, refrigerators, various piping, valves, and the like. As the metal to which the present invention is applied, iron-based metals are preferred. For example, in carbon steel pipes (STB pipes) for boilers and heat exchangers, an excellent anti-corrosion effect can be obtained.
(步驟(1)) 在本發明的防蝕方法中,首先,向所述冷卻水系統內添加選自酒石酸及酒石酸鹽的一種以上的化合物(A)使其與所述金屬構件接觸。(step 1)) In the anticorrosion method of the present invention, first, one or more compounds (A) selected from tartaric acid and tartrates are added to the cooling water system and brought into contact with the metal member.
化合物(A)為酒石酸系化合物,即選自酒石酸及酒石酸鹽的化合物。 所述酒石酸系化合物被認為是藉由由分子內的羥基吸附於金屬構件表面形成吸附皮膜而對該金屬構件賦予防蝕效果。此種吸附皮膜相較於藉由磷酸系防蝕劑形成的防蝕皮膜即沈澱皮膜,成膜形成速度快,可實現防蝕處理時間的縮短。Compound (A) is a tartaric acid-based compound, that is, a compound selected from tartaric acid and tartrate salts. The tartaric acid-based compound is considered to impart an anti-corrosion effect to the metal member by adsorbing the hydroxyl group in the molecule to form an adsorption film on the surface of the metal member. Compared with the anti-corrosion film formed by the phosphoric acid-based anti-corrosion agent, that is, the precipitation film, this adsorption film has a faster film formation speed and can shorten the anti-corrosion treatment time.
另外,雖然藉由化合物(A)可獲得防蝕效果的機制的詳細情況不明確,但推測如下。 由化合物(A)產生的酒石酸離子與冷卻水中存在的鈣離子鍵結,而將以難溶於水的鈣鹽為主體的吸附皮膜形成於所述金屬構件表面。而且,化合物(A)與所述金屬構件的鐵成分進行反應,藉此亦可藉由酒石酸鐵(II)形成吸附皮膜。 認為:藉由此種吸附皮膜(防蝕皮膜),阻礙所述金屬構件與、溶氧或氯化物離子、硫酸離子等所述冷卻水系統中所含的腐蝕因子直接接觸,從而可減小金屬構件表面中的腐蝕速度。In addition, although the details of the mechanism by which the anticorrosion effect is obtained by the compound (A) are not clear, it is estimated as follows. The tartrate ions generated from the compound (A) bond to the calcium ions present in the cooling water to form an adsorption film mainly composed of a poorly water-soluble calcium salt on the surface of the metal member. Furthermore, the compound (A) reacts with the iron component of the metal member, whereby an adsorption film can also be formed by the iron (II) tartrate. It is considered that this adsorption film (anti-corrosion film) prevents the metal member from being in direct contact with the corrosion factors contained in the cooling water system, such as dissolved oxygen or chloride ions, sulfuric acid ions, etc., thereby reducing the corrosion resistance of the metal member. Corrosion rate in the surface.
酒石酸不論是L體、D體、內消旋體或外消旋體(racemate)中的哪一者。 所述酒石酸鹽是指選自酒石酸分子內的兩個羥基的氫原子及兩個羧基的氫原子中的一個以上的氫原子自酒石酸電離而成的酒石酸離子(陰離子)與源自鹼的陽離子進行離子鍵結而成的化合物。作為所述陽離子,例如可列舉:鹼金屬離子、鹼土類金屬離子、鎂離子、鋅離子、鋁離子、鐵離子(II)、銨離子等。 作為所述酒石酸鹽的具體例,可列舉:酒石酸氫鈉、酒石酸氫鉀、酒石酸鋰、酒石酸鈉、酒石酸鉀、酒石酸鉀鈉、酒石酸鈣、酒石酸鐵(II)、酒石酸鋅、酒石酸銨等。該些中,就良好的防蝕效果或容易獲得性等的觀點而言,較佳為酒石酸鈉、酒石酸鉀、酒石酸鈉鉀。 化合物(A)可為單獨一種,亦可併用兩種以上。Tartaric acid does not matter whether it is L body, D body, meso body, or racemate (racemate). Described tartrate refers to the tartaric acid ion (anion) that is selected from the hydrogen atom of two hydroxyl groups and the hydrogen atom of two carboxyl groups in the tartaric acid molecule from the ionization of tartrate ion (anion) and the cation derived from the alkali. Compounds made of ionic bonds. Examples of the cation include alkali metal ions, alkaline earth metal ions, magnesium ions, zinc ions, aluminum ions, iron ions (II), and ammonium ions. Specific examples of the tartrate include sodium hydrogen tartrate, potassium hydrogen tartrate, lithium tartrate, sodium tartrate, potassium tartrate, potassium sodium tartrate, calcium tartrate, iron (II) tartrate, zinc tartrate, ammonium tartrate, and the like. Among these, sodium tartrate, potassium tartrate, and sodium potassium tartrate are preferable from the viewpoint of a good anticorrosion effect, easy availability, and the like. Compound (A) may be used alone or in combination of two or more.
化合物(A)較佳為以酒石酸換算量計30 mg/L~100 mg/L的濃度添加於所述冷卻水系統內,更佳為40 mg/L~90 mg/L、進而佳為50 mg/L~70 mg/L。 藉由使所述濃度為30 mg/L以上,可獲得良好的防蝕效果。而且,若為100 mg/L以下,則可抑制所述金屬構件發生由酒石酸離子的螯合作用引起的腐蝕。Compound (A) is preferably added to the cooling water system at a concentration of 30 mg/L-100 mg/L in terms of tartaric acid conversion, more preferably 40 mg/L-90 mg/L, and more preferably 50 mg /L~70 mg/L. By making the above-mentioned concentration 30 mg/L or more, a good anti-corrosion effect can be obtained. Moreover, when it is 100 mg/L or less, corrosion of the metal member due to chelation of tartrate ions can be suppressed.
步驟(1)中的冷卻水系統的pH較佳為6.0~8.0,更佳為6.0~7.5,進而佳為6.5~7.5。 藉由使所述pH為6.0以上,可抑制所述金屬構件發生酸腐蝕。而且,藉由使所述pH為8.0以下,酒石酸離子與自所述金屬構件的表面溶出的金屬離子(例如,鐵離子)進行反應,而容易形成防蝕皮膜。 另外,本發明中的pH是依據日本工業標準(Japanese Industrial Standards,JIS)Z 8802:2011,並利用玻璃電極法測定的值。 根據所述冷卻水系統的水質,可以使pH成為所述範圍內的方式,選擇使用酒石酸及酒石酸鹽中的任一者作為化合物(A)。而且,所述pH例如可使用硫酸、氫氧化鈉、氫氧化鉀等一般性的pH調整劑來進行調整。The pH of the cooling water system in step (1) is preferably from 6.0 to 8.0, more preferably from 6.0 to 7.5, and still more preferably from 6.5 to 7.5. By setting the pH to 6.0 or higher, acid corrosion of the metal member can be suppressed. And by making the said pH into 8.0 or less, tartrate ions react with the metal ion (for example, iron ion) eluted from the surface of the said metal member, and it becomes easy to form an anticorrosion film. In addition, the pH in this invention is a value measured by the glass electrode method based on Japanese Industrial Standards (Japanese Industrial Standards, JIS) Z 8802:2011. Depending on the water quality of the cooling water system, either one of tartaric acid and a tartrate salt can be selected and used as the compound (A) so that the pH falls within the above-mentioned range. Moreover, the said pH can be adjusted using general pH adjusters, such as sulfuric acid, sodium hydroxide, and potassium hydroxide, for example.
所述金屬構件與化合物(A)的接觸時間較佳為20小時~30小時,更佳為20小時~28小時,進而佳為20小時~24小時。 若所述接觸時間為20小時以上,則可獲得良好的防蝕效果。而且,在超過30小時的情況下,無法期待防蝕效果隨時間的提高,因此就防蝕效果的觀點而言,較佳為30小時以下。 另外,所述接觸時間在所述冷卻水系統中通水有冷卻水的情況下,相當於所述通水時間。而且,在為循環冷卻水系統的情況下,亦可視為冷卻水的循環時間。為了使化合物(A)以均勻的濃度遍及所述金屬構件表面,所述冷卻水系統較佳為設為通水狀態,而且,就效率性的觀點而言,較佳為進行循環。The contact time between the metal member and the compound (A) is preferably 20 hours to 30 hours, more preferably 20 hours to 28 hours, and still more preferably 20 hours to 24 hours. If the contact time is more than 20 hours, a good anti-corrosion effect can be obtained. Moreover, when it exceeds 30 hours, improvement with time of an anticorrosion effect cannot be expected, Therefore From a viewpoint of an anticorrosion effect, it is preferable that it is 30 hours or less. In addition, the contact time is equivalent to the water passing time when the cooling water is passed through the cooling water system. Furthermore, in the case of a circulating cooling water system, it can also be regarded as the circulation time of cooling water. In order to make the compound (A) spread over the surface of the metal member at a uniform concentration, the cooling water system is preferably in a water-flowing state, and is preferably circulated from the viewpoint of efficiency.
在將本發明的防蝕方法應用於基礎處理的情況下,步驟(1)較佳為在對該冷卻水系統不施加熱負荷的狀態下進行。 本說明書中提及的「不施加熱負荷的狀態」是指穩定運轉前的狀態,即未向與冷卻水系統的接觸面,導入要藉由該冷卻水進行冷卻的高溫流體,該冷卻水未被所述高溫流體加熱的狀態,即非傳熱狀態。 不施加熱負荷的狀態下的具體的溫度較佳為10℃~40℃,更佳為15℃~35℃,進而佳為20℃~30℃。 藉由為所述範圍內的溫度,冷卻水系統中的蒸發被抑制,從而容易將化合物(A)的濃度維持為固定。When applying the anticorrosion method of the present invention to basic treatment, step (1) is preferably performed in a state where no thermal load is applied to the cooling water system. The "state without thermal load" mentioned in this manual refers to the state before stable operation, that is, the high-temperature fluid to be cooled by the cooling water is not introduced into the contact surface with the cooling water system, and the cooling water is not used. The state heated by the high-temperature fluid, that is, the non-heat transfer state. The specific temperature in a state where no heat load is applied is preferably from 10°C to 40°C, more preferably from 15°C to 35°C, and still more preferably from 20°C to 30°C. When the temperature is within the above range, evaporation in the cooling water system is suppressed, and it becomes easy to maintain the concentration of the compound (A) constant.
就可在所述金屬構件表面獲得均勻的防蝕效果的觀點而言,冷卻水系統中的化合物(A)的濃度較佳為維持為固定。 當在步驟中途,因化合物(A)隨著向該冷卻水系統中存在的腐蝕產物的附著等而顯著消耗等,化合物(A)的濃度下降時,較佳為追加化合物(A),來實現所述濃度範圍。而且,當在步驟中途,因該冷卻水系統中的蒸發等,化合物(A)的濃度上升時,亦可補給水來進行稀釋。From the viewpoint of obtaining a uniform anti-corrosion effect on the surface of the metal member, the concentration of the compound (A) in the cooling water system is preferably kept constant. In the middle of the step, when the concentration of the compound (A) decreases due to the significant consumption of the compound (A) due to the adhesion of corrosion products existing in the cooling water system, etc., it is preferable to add the compound (A) to achieve the concentration range. Furthermore, when the concentration of the compound (A) increases due to evaporation in the cooling water system or the like in the middle of the process, water may be supplied for dilution.
(步驟(2)) 在步驟(1)之後,向所述冷卻水系統內添加選自鋅及鋅鹽的一種以上的化合物(B)使其與所述金屬構件接觸。(step (2)) After step (1), one or more compounds (B) selected from zinc and zinc salts are added to the cooling water system to make contact with the metal member.
化合物(B)是鋅系化合物,即選自鋅及鋅鹽的化合物。作為鋅鹽,例如可列舉氯化鋅、硫酸鋅等。化合物(B)可為單獨一種,亦可併用兩種以上。 如上所述,在針對所述金屬構件,利用具有抑制其表面的陽極反應的效果的化合物(A)進行處理後,進而利用具有抑制陰極反應的效果的化合物(B)進行處理,藉此可以短時間的防蝕處理,藉由兩化合物的協作效果,對該金屬構件賦予優異的防蝕效果。 另外,在同時添加化合物(A)及化合物(B)的情況下,酒石酸離子作為對鋅離子的分散劑而發揮作用,藉此無法獲得良好的防蝕效果。Compound (B) is a zinc-based compound, that is, a compound selected from zinc and zinc salts. As a zinc salt, zinc chloride, zinc sulfate, etc. are mentioned, for example. The compound (B) may be used alone or in combination of two or more. As described above, after treating the metal member with the compound (A) having the effect of suppressing the anodic reaction on the surface, and then treating the metal member with the compound (B) having the effect of suppressing the cathodic reaction, it can be shortened. Time-based anti-corrosion treatment, through the synergistic effect of the two compounds, imparts an excellent anti-corrosion effect to the metal member. In addition, when the compound (A) and the compound (B) are added simultaneously, tartrate ions function as a dispersant for zinc ions, whereby a favorable anticorrosion effect cannot be obtained.
化合物(B)較佳為以鋅換算量計1 mg/L~50 mg/L的濃度添加於所述冷卻水系統內,更佳為2 mg/L~30 mg/L,進而佳為3 mg/L~20 mg/L,尤佳為3 mg/L~10 mg/L。 若為所述範圍內的濃度,則可獲得良好的防蝕效果。但是,若所述濃度變高,則所述金屬構件上容易附著污垢(scale),因此作為上限,較佳為50 mg/L以下,更佳為30 mg/L以下,進而佳為20 mg/L以下,尤佳為10 mg/L以下。Compound (B) is preferably added to the cooling water system at a concentration of 1 mg/L-50 mg/L in terms of zinc conversion, more preferably 2 mg/L-30 mg/L, and more preferably 3 mg /L~20 mg/L, preferably 3 mg/L~10 mg/L. If it is a concentration within the above range, a good anti-corrosion effect can be obtained. However, if the concentration becomes high, scale will easily adhere to the metal member, so as the upper limit, it is preferably 50 mg/L or less, more preferably 30 mg/L or less, and even more preferably 20 mg/L. L or less, preferably less than 10 mg/L.
所述金屬構件與化合物(B)的接觸時間較佳為20小時~30小時,更佳為20小時~28小時,進而佳為20小時~24小時。 若所述接觸時間為20小時以上,則可獲得良好的防蝕效果。而且,在超過30小時的情況下,無法期待防蝕效果隨時間的提高,因此就防蝕效果的觀點而言,較佳為30小時以下。 另外,所述接觸時間與關於所述化合物(A)的接觸時間的意義相同。為了使化合物(B)以均勻的濃度遍及所述金屬構件表面,所述冷卻水系統較佳為設為通水狀態,而且,就效率性的觀點而言,較佳為進行循環。The contact time between the metal member and the compound (B) is preferably 20 hours to 30 hours, more preferably 20 hours to 28 hours, and still more preferably 20 hours to 24 hours. If the contact time is more than 20 hours, a good anti-corrosion effect can be obtained. Moreover, when it exceeds 30 hours, improvement with time of an anticorrosion effect cannot be expected, Therefore From a viewpoint of an anticorrosion effect, it is preferable that it is 30 hours or less. In addition, the said contact time has the same meaning as the contact time with respect to the said compound (A). In order to make the compound (B) spread over the surface of the metal member at a uniform concentration, the cooling water system is preferably in a water-passing state, and is preferably circulated from the viewpoint of efficiency.
在將本發明的防蝕方法應用於基礎處理的情況下,步驟(2)亦與所述步驟(1)同樣地,較佳為在對該冷卻水系統不施加熱負荷的狀態下進行。就容易將化合物(B)的濃度維持為固定的觀點而言,具體的溫度亦與步驟(1)相同。When applying the anticorrosion method of the present invention to basic treatment, step (2) is preferably performed in a state where no thermal load is applied to the cooling water system, as in the above step (1). The specific temperature is also the same as that in the step (1) from the viewpoint that it is easy to keep the concentration of the compound (B) constant.
就可在所述金屬構件表面獲得均勻的防蝕效果的觀點而言,冷卻水系統中的化合物(B)的濃度較佳為維持為固定。 當在步驟中途,因化合物(B)的顯著消耗等,化合物(B)的濃度下降時,較佳為追加化合物(B),來實現所述濃度範圍。而且,當在步驟中途,因該冷卻水系統中的蒸發等,化合物(B)的濃度上升時,亦可補給水來進行稀釋。From the viewpoint of obtaining a uniform anti-corrosion effect on the surface of the metal member, the concentration of the compound (B) in the cooling water system is preferably kept constant. When the concentration of the compound (B) decreases due to significant consumption of the compound (B) in the middle of the step, it is preferable to add the compound (B) to achieve the concentration range. Furthermore, when the concentration of the compound (B) increases due to evaporation in the cooling water system or the like in the middle of the process, water may be supplied for dilution.
在所述冷卻水系統為通水狀態的情況下,該冷卻水系統的通水速度即流速並無特別限定,例如在將本發明的防蝕方法應用於基礎處理的情況下,冷卻水系統的穩定運轉時的流速通常為0.3 m/s~1.0 m/s,相對於此,即便是與此相同或低速,具體而言即便是0.2 m/s~0.5 m/s,根據本發明的防蝕方法,亦可獲得良好的防蝕效果。In the case where the cooling water system is in a water-through state, the water-through speed of the cooling water system, that is, the flow rate, is not particularly limited. For example, when the anti-corrosion method of the present invention is applied to basic treatment, the stability of the cooling water system The flow velocity during operation is usually 0.3 m/s to 1.0 m/s, but even if it is the same or at a low velocity, specifically, even if it is 0.2 m/s to 0.5 m/s, according to the corrosion prevention method of the present invention, Good anti-corrosion effect can also be obtained.
在將本發明的防蝕方法應用於基礎處理的情況下,在結束作為基礎處理的步驟(1)及步驟(2)後,開始穩定運轉。此時,所述穩定運轉時,亦可在該冷卻水系統內包含化合物(A)及/或化合物(B)。 在所述冷卻水系統中,可添加黏泥防止劑、污垢防止劑、其他防蝕劑等公知的水處理藥劑,進行穩定運轉。實施例 When applying the anticorrosion method of the present invention to the basic treatment, the steady operation is started after the steps (1) and (2) as the basic treatment are completed. In this case, the compound (A) and/or the compound (B) may be contained in the cooling water system during the stable operation. In the cooling water system, well-known water treatment chemicals such as slime inhibitors, fouling inhibitors, and other corrosion inhibitors can be added to perform stable operation. Example
以下,對本發明進行更詳細的說明,但本發明並不由下述實施例限定。
另外,以下的各試驗中使用的水為栃木縣下都賀郡野木町的自來水(pH 7.0、鈣硬度40 mgCaCO3
/L、離子狀二氧化矽濃度 20 mgSiO2
/L)。Hereinafter, the present invention will be described in more detail, but the present invention is not limited by the following examples. In addition, water used in each of the following tests was tap water in Nogi Town, Shimotsuga-gun, Tochigi Prefecture (pH 7.0, calcium hardness 40 mgCaCO 3 /L,
[試驗1]腐蝕減少量評價 (實施例1) 將30 mm×50 mm、厚度1 mm的SPCC(冷軋鋼板)的試驗片在濃度20質量%的硝酸中浸漬30秒鐘後,進而在濃度10質量%的硫酸中浸漬60秒鐘,藉此進行蝕刻處理。將此試驗片水洗後,進行乾燥,測定試驗前重量(W1)。 在1 L的燒杯中放入水,添加濃度50 mg/L(酒石酸換算量)的酒石酸鈉,獲得pH調整為7.5的試驗液。藉由旋轉腐蝕試驗裝置(信和化工股份有限公司製造;試驗液溫度30℃、試驗片旋轉速度150 rpm)將所述試驗片在所述試驗液中浸漬24小時後,在所述試驗液中添加濃度5 mg/L(鋅換算量)的氯化鋅,進而繼續浸漬24小時。將此試驗液更換為水,進而浸漬24小時後,提起試驗片,進行乾燥,測定試驗後重量(W2)。 將自試驗前重量(W1)減去試驗後重量(W2)而得的值(W1-W2)作為腐蝕減少量來求出。[Test 1] Evaluation of corrosion reduction (Example 1) A 30 mm x 50 mm, 1 mm thick SPCC (cold-rolled steel sheet) test piece was immersed in nitric acid with a concentration of 20 mass % for 30 seconds, and then immersed in sulfuric acid with a concentration of 10 mass % for 60 seconds. Perform etching treatment. After this test piece was washed with water, it was dried, and the weight before the test (W1) was measured. Water was placed in a 1 L beaker, and sodium tartrate at a concentration of 50 mg/L (in terms of tartaric acid) was added to obtain a test solution whose pH was adjusted to 7.5. After immersing the test piece in the test solution for 24 hours by means of a rotary corrosion test device (manufactured by Shinwa Chemical Co., Ltd.; test solution temperature 30°C, test piece rotation speed 150 rpm), add Concentration of 5 mg/L (zinc equivalent) of zinc chloride, and then continue to immerse for 24 hours. After replacing this test solution with water and further immersing it for 24 hours, the test piece was pulled up, dried, and the weight after the test (W2) was measured. The value (W1-W2) obtained by subtracting the weight after the test (W2) from the weight before the test (W1) was determined as the amount of corrosion reduction.
(比較例1) 在實施例1中,不添加氯化鋅,在酒石酸鈉水溶液的試驗液中浸漬48小時後,將此試驗液更換為水,除此以外,以與實施例1同樣的方式求出腐蝕減少量。(comparative example 1) In Example 1, zinc chloride was not added, and after 48 hours of immersion in the test solution of sodium tartrate aqueous solution, the test solution was replaced with water, and the amount of corrosion reduction was obtained in the same manner as in Example 1. .
(比較例2) 在實施例1中,在自開始便同時添加有酒石酸鈉及氯化鋅的水溶液的試驗液中浸漬48小時後,將此試驗液更換為水,除此以外,以與實施例1同樣的方式求出腐蝕減少量。(comparative example 2) In Example 1, after 48 hours of immersion in the test solution to which the aqueous solution of sodium tartrate and zinc chloride was added at the same time from the beginning, the test solution was replaced with water, and in the same manner as in Example 1 Calculate the corrosion reduction.
在下述表1中示出試驗1的結果。The results of
[表1]
表1
根據表1中所示的結果可知,在之後向酒石酸鈉中添加氯化鋅的情況下(實施例1),腐蝕減少量少,可謂形成了良好的防蝕皮膜。 另外,認為:在同時添加氯化鋅及酒石酸鈉的情況下(比較例2),酒石酸離子作為對鋅離子的分散劑而發揮作用,相較於僅添加酒石酸鈉(未添加氯化鋅)的情況(比較例1),更不易形成防蝕皮膜,因此腐蝕減少量變多。From the results shown in Table 1, it can be said that when zinc chloride was added to sodium tartrate later (Example 1), the amount of corrosion reduction was small and a good anticorrosion film was formed. In addition, it is considered that when zinc chloride and sodium tartrate were added together (comparative example 2), tartrate ions functioned as a dispersant for zinc ions, and compared with the case where only sodium tartrate was added (no zinc chloride was added), In the case (Comparative Example 1), the formation of the anti-corrosion film is more difficult, so the amount of corrosion reduction increases.
[試驗2]模擬實機試驗
在圖1中所示般的冷卻水系統的熱交換器試驗裝置中,針對多管式熱交換器1內的管(tube)2(STB340(熱交換器用碳鋼鋼管)、外徑19 mm、厚度2.3 mm、長度1350 mm、2根),進行下述實施例及比較例的基礎處理後,進行穩定運轉,進行最大孔蝕深度及污垢附著速度的評價。
熱交換器1連接於冷卻塔3,由冷卻塔3的下部的500 L貯水槽4藉由送水泵P1供給添加了規定的藥劑的冷水。所述冷水在熱交換器1內的管2內流通。對於熱交換器1內的管2的外側,經由溫度調整閥V1而供給蒸氣(熱源)10。所述蒸氣被在管2內流通的冷水冷卻,作為排放水(drain)11而排出。因與蒸氣10的熱交換,冷水被加熱而成為溫水,被送至冷卻塔3,並被散水至填充材5。自冷卻塔3的側周部將空氣吸入至冷卻塔3內,並藉由上部的排氣扇(fan)6排氣。
[Test 2] Simulated real machine test
In the heat exchanger test device of the cooling water system shown in Figure 1, for the tube (tube) 2 (STB340 (carbon steel pipe for heat exchanger) in the
對於貯水槽4內的冷水,由藥劑槽7藉由藥劑注入泵P2添加水處理藥劑。貯水槽4內的冷水中的水處理藥劑的濃度或水質等是藉由導電率自動管理裝置8(「庫裡奧拓(kuriauto)(註冊商標)C-505」、栗田工業股份有限公司製造)進行管理,亦可使藥劑注入泵P2與排放泵(blow pump)P3連動,來適當進行排放。而且,可視需要添加補給水20。
To the cold water in the
[試驗2-1]氯化鋅的添加量的影響的確認 [Test 2-1] Confirmation of the influence of the addition amount of zinc chloride
(實施例2) (Example 2)
如下般進行管2的基礎處理。在貯水槽4中貯水合成水(鈣硬度100mgCaCO3/L、總硬度150mgCaCO3/L、酸消耗量30mgCaCO3/L),添加濃度50mg/L(酒石酸換算量)的酒石酸鈉,調整為pH 7.5。打開循環用閥V2,將此水以流量5.3L/min(流速0.5m/s)通水至管2中的一根試驗管A。另外,流量是利用熱交換器1的入口附近的流量計9進行測定(以下,相同)。
Base treatment of
24小時後,向此水中添加濃度2mg/L(鋅換算量)的氯化鋅,繼續保持所述流量(流速)向試驗管A通水24小時。After 24 hours, add zinc chloride with a concentration of 2mg/L (zinc conversion amount) to this water, and continue to maintain the flow rate (flow rate) to pass water to the test tube A for 24 hours.
(實施例3~實施例5及比較例3)
在實施例2中,將之後添加的氯化鋅的濃度變更為5 mg/L(鋅換算量)、10 mg/L(鋅換算量)、30 mg/L(鋅換算量)、0 mg/L(未添加),除此以外,以與實施例2同樣的方式,進行管2的基礎處理。(Example 3 to Example 5 and Comparative Example 3)
In Example 2, the concentration of zinc chloride added later was changed to 5 mg/L (converted amount of zinc), 10 mg/L (converted amount of zinc), 30 mg/L (converted amount of zinc), 0 mg/L Except for L (not added), the base treatment of the
(參考例1)
如此進行管2的基礎處理。在貯水槽4中貯水與實施例2相同的合成水,並同時添加濃度100 mg/L(磷酸換算量)的六偏磷酸鈉(sodium hexametaphosphate)及濃度20 mg/L(鋅換算量)的氯化鋅,調整為pH 7.5。打開循環用閥V2,將此水以與實施例2相同的流量(流速)向試驗管A中通水4天。(reference example 1)
Base treatment of
〔通水試驗(1)〕
進行所述各實施例、比較例及參考例的基礎處理後,在貯水槽4內,製備合成水(pH 8.5~8.7、鈣硬度450 mgCaCO3
/L~500 mgCaCO3
/L、酸消耗量130 mgCaCO3
/L~170 mgCaCO3
/L、馬來酸系聚合物10 mgsolid/L~15 mgsolid/L、氯化鋅1.8 mg/L~2.2 mg/L(鋅換算量))。然後,向所述合成水中,以使馬來酸系聚合物及鋅維持所述濃度範圍的方式進行藥劑注入,而且,作為黏泥控制劑,將次氯酸鈉以使總殘留氯濃度成為0.1 mg/L~0.2 mg/L的方式予以藥劑注入。
開始裝置的運轉,以流速0.5 m/s向試驗管A中通水,進行運轉。以供給至熱交換器1的水的入口水溫(冷水)成為30℃,出口水溫(溫水)成為40℃的方式進行控制。在運轉第14日,結束通水試驗。[Water flow test (1)] After performing the basic treatment of each of the examples, comparative examples, and reference examples, synthetic water (pH 8.5 to 8.7, calcium hardness 450 mgCaCO 3 /L to 500 mgCaCO 3 /L, acid consumption 130 mgCaCO 3 /L~170 mgCaCO 3 /L,
通水試驗結束後,取下試驗管A。將試驗管A每隔長度200 mm切斷並進行對半分割,製作評價用管。如下求出最大孔蝕深度及污垢附著速度,藉此針對所述各實施例、比較例及參考例的基礎處理的方法進行評價。After the water test is over, remove the test tube A. The test tube A was cut at intervals of 200 mm in length and divided in half to prepare tubes for evaluation. The maximum pitting depth and the scale deposition rate were obtained as follows, and the basic treatment methods of the above-mentioned examples, comparative examples, and reference examples were evaluated.
・最大孔蝕深度 針對每個評價用管,目視觀察管內表面,藉由刻度盤規(dial gauge)測定孔蝕深度。將針對所有的評價用管測定的孔蝕深度中的最大值設為最大孔蝕深度。 所述最大孔蝕深度為防蝕效果的指標,可謂值越小,防蝕效果越優異。・Maximum pitting depth For each tube for evaluation, the inner surface of the tube was visually observed, and the pitting depth was measured with a dial gauge. The maximum value among the pitting depths measured for all the tubes for evaluation was set as the maximum pitting depth. The maximum pitting depth is an index of the anti-corrosion effect, and it can be said that the smaller the value, the better the anti-corrosion effect.
・污垢附著速度 針對每個評價用管,回收管內表面的附著物並進行乾燥,測定質量。將所述附著物視為污垢,針對每個評價用管,算出管內表面的表面積1 cm2 中,平均1個月的污垢附著量[mg/(cm2 ・month)]。將針對所有的評價用管算出的污垢附著量中的最大值設為污垢附著速度。 所述污垢附著速度可謂值越小,污垢附著抑制效果越優異。・Fouling adhesion speed For each evaluation tube, the deposits on the inner surface of the tube were recovered and dried to measure the mass. The deposits were regarded as dirt, and for each tube for evaluation, the amount of dirt deposited on average for one month [mg/(cm 2 ・month)] in a surface area of 1 cm 2 on the inner surface of the tube was calculated. The maximum value among the amounts of stain deposition calculated for all the tubes for evaluation was defined as the stain deposition rate. It can be said that the smaller the value of the dirt adhesion rate, the more excellent the dirt adhesion inhibiting effect.
在下述表2中示出該些的評價結果。These evaluation results are shown in Table 2 below.
[表2]
表2
根據表2中所示的結果可知,確認到:藉由在管2的基礎處理中,在添加酒石酸鈉後,添加氯化鋅(實施例2~實施例5),與以往將磷酸系防蝕劑與氯化鋅併用的情況(參考例1)相比,即便酒石酸鈉及氯化鋅的添加量即防蝕劑的添加量少,仍可以更短的處理時間獲得高的防蝕效果。
而且,確認到:相較於作為以往方法的與磷酸鈉併用的情況(參考例1),藉由與酒石酸鈉併用,只要將氯化鋅的添加濃度抑制為規定量(實施例2及實施例3),便會在污垢附著抑制效果的方面優異。
另外,認為:若氯化鋅的添加濃度變高(實施例4及實施例5),則鋅離子會成為污垢起因物質,因此污垢附著速度增大。From the results shown in Table 2, it was confirmed that by adding zinc chloride (Example 2 to Example 5) after adding sodium tartrate in the basic treatment of
[試驗2-2]流速的影響的確認
(實施例6、實施例7、比較例4及參考例2)
在實施例3、實施例5、比較例3及參考例1中,代替向試驗管A通水,而設為向管2中的另一試驗管B以流量3.2 L/min(流速0.3 m/s)進行通水,除此以外,以與實施例3、實施例5、比較例3及參考例1分別相同的方式,作為實施例6、實施例7、比較例4及參考例2分別進行管2的基礎處理。[Test 2-2] Confirmation of the influence of the flow rate
(Example 6, Example 7, Comparative Example 4 and Reference Example 2)
In
〔通水試驗(2)〕 進行所述各實施例、比較例及參考例的基礎處理後,進行與所述試驗2-1的通水試驗(1)相同的通水試驗。關於本試驗2-2中的通水試驗(2),是在所述通水試驗(1)中,代替向試驗管A通水,而設為向試驗管B以流速0.3 m/s進行通水,除此以外,以與所述通水試驗(1)同樣的方式進行。[Water test (2)] After performing the basic treatment of each of the Examples, Comparative Examples, and Reference Examples, a water-passing test similar to the water-passing test (1) of the above-mentioned Test 2-1 was performed. Regarding the water passage test (2) in this test 2-2, in the water passage test (1), instead of passing water to the test pipe A, it is set to pass water to the test pipe B at a flow rate of 0.3 m/s. Water was performed in the same manner as the above-mentioned water passage test (1) except for that.
通水試驗結束後,取下試驗管B,以與所述試驗2-1中的評價方法同樣的方式,求出最大孔蝕深度及污垢附著速度,針對所述各實施例、比較例及參考例的基礎處理的方法進行評價。 在下述表3中,示出該些的評價結果。After the water test was over, the test tube B was removed, and in the same manner as the evaluation method in the test 2-1, the maximum pitting depth and dirt adhesion speed were obtained. For the various embodiments, comparative examples and reference Case-based methods are evaluated. These evaluation results are shown in Table 3 below.
[表3]
表3
根據表3中所示的結果可知,確認到:即便是在低流速(0.3 m/s)的情況下(實施例6及實施例7)中,亦可獲得與流速0.5 m/s的情況(實施例3及實施例5)相同的高的防蝕效果。From the results shown in Table 3, it was confirmed that even in the case of low flow velocity (0.3 m/s) (Example 6 and Example 7), the same flow rate as that of the flow velocity of 0.5 m/s ( Example 3 and Example 5) have the same high anti-corrosion effect.
1:多管式熱交換器(熱交換器) 2:管 3:冷卻塔 4:貯水槽 5:填充材 6:排氣扇 7:藥劑槽 8:導電率自動管理裝置 9:流量計 10:蒸氣 11:排放水 20:補給水 P1:送水泵 P2:藥劑注入泵 P3:排放泵 V1:溫度調整閥 V2:循環用閥1: Multi-tubular heat exchanger (heat exchanger) 2: tube 3: cooling tower 4: Water storage tank 5: Filling material 6:Exhaust fan 7: potion tank 8: Conductivity automatic management device 9: Flow meter 10: steam 11: discharge water 20: Supply water P1: water pump P2: Pharmacy Injection Pump P3: discharge pump V1: temperature adjustment valve V2: Valve for circulation
圖1是表示實施例中的冷卻水系統的熱交換器試驗裝置的概要的示意圖。FIG. 1 is a schematic diagram showing an outline of a heat exchanger test device for a cooling water system in an example.
1:多管式熱交換器 1: Multi-tube heat exchanger
2:管 2: tube
3:冷卻塔 3: cooling tower
4:貯水槽 4: Water storage tank
5:填充材 5: Filling material
6:排氣扇 6:Exhaust fan
7:藥劑槽 7: potion tank
8:導電率自動管理裝置 8: Conductivity automatic management device
9:流量計 9: Flow meter
10:蒸氣 10: steam
11:排放水 11: discharge water
20:補給水 20: Supply water
P1:送水泵 P1: water pump
P2:藥劑注入泵 P2: Pharmacy Injection Pump
P3:排放泵 P3: discharge pump
V1:溫度調整閥 V1: temperature adjustment valve
V2:循環用閥 V2: Valve for circulation
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KR20210082178A (en) | 2021-07-02 |
JP2020070478A (en) | 2020-05-07 |
JP6635173B1 (en) | 2020-01-22 |
CN112955583B (en) | 2022-05-27 |
WO2020090526A1 (en) | 2020-05-07 |
KR102524270B1 (en) | 2023-04-20 |
TW202028535A (en) | 2020-08-01 |
CN112955583A (en) | 2021-06-11 |
PH12021550984A1 (en) | 2021-11-08 |
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