TWI604092B - Cast iron pickling agent and cast iron pickling corrosion inhibiting agent - Google Patents
Cast iron pickling agent and cast iron pickling corrosion inhibiting agent Download PDFInfo
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本發明係關於一種酸洗劑及酸洗腐蝕抑制劑，特別是關於一種鑄鐵酸洗劑及鑄鐵酸洗腐蝕抑制劑。 This invention relates to a pickling agent and a pickling corrosion inhibitor, and more particularly to a cast iron pickling agent and a cast iron pickling corrosion inhibitor.
在工業上經常應用無機酸為金屬結垢酸洗的主要酸洗液，對較大體積金屬材料進行酸浸除銹與表面除垢的作業。由於無機酸的價格相對便宜及容易採購，因此廣泛應用在工業清洗中，然而無機酸也對金屬造成不可避免的腐蝕。 In the industry, the main acid washing liquid in which the inorganic acid is metal scale pickling is often used, and the operation of acid leaching and descaling on the large volume metal material is carried out. Since inorganic acids are relatively inexpensive and easy to purchase, they are widely used in industrial cleaning, but inorganic acids also cause inevitable corrosion to metals.
中國大陸發明專利(公開號：CN101851761A)公開一種硫酸酸洗緩蝕抑霧劑及其製備方法，主要成分包括抑制劑、絡合劑及濕潤劑。抑制劑包括二鄰甲苯硫脲、鄰甲基苯胺、磺化蛋白質及乙二胺四乙酸。絡合劑包括檸檬酸鈉、酒石酸鈉、羥基醋酸及沒食子酸。濕潤劑包括磺酸鈉、羥酸鈉、L-548及OP-10。 The Chinese mainland invention patent (Publication No.: CN101851761A) discloses a sulfuric acid pickling corrosion inhibitor and a preparation method thereof, and the main components thereof include an inhibitor, a complexing agent and a wetting agent. Inhibitors include di-o-tolylthiourea, o-methylaniline, sulfonated proteins, and ethylenediaminetetraacetic acid. Complexing agents include sodium citrate, sodium tartrate, glycolic acid, and gallic acid. Wetting agents include sodium sulfonate, sodium hydroxylate, L-548 and OP-10.
另外，中國大陸發明專利(公開號：CN103046063A)公開一種不銹鋼酸洗酸霧抑制劑及其製備方法，主要成分包括非離子型表面活性劑、陰離子型表面活性劑、穩泡劑及水。以質量百分比計，非離子型表面活性劑是在0.2至1.0%、陰離子型表面活性劑是在0.1至0.3%、穩泡劑是在0.5至1.0%及餘量的水。非離子型表面活性劑為高級脂肪醇聚氧化乙烯醚、高級脂肪酸聚氧化乙烯醚、高級脂肪胺聚氧化乙烯醚中的一種或多種，其中烷基碳數是10至26，環氧乙烷加成數是5至20。陰離子型表面活性劑為長鏈烷基磺酸鈉、長鏈烷基硫酸酯或長鏈烷基苯磺酸鈉，其中烷基碳數是8至18，穩泡劑為低碳脂肪胺或無機銨鹽。 In addition, the Chinese mainland invention patent (Publication No.: CN103046063A) discloses a stainless steel pickling acid mist inhibitor and a preparation method thereof, and the main components thereof include a nonionic surfactant, an anionic surfactant, a foam stabilizer and water. The nonionic surfactant is in the range of 0.2 to 1.0% by mass, the anionic surfactant is 0.1 to 0.3%, and the foam stabilizer is 0.5 to 1.0% and the balance is water. The nonionic surfactant is one or more of a higher aliphatic alcohol polyoxyethylene ether, a higher fatty acid polyoxyethylene ether, a higher fatty amine polyoxyethylene ether, wherein the alkyl carbon number is 10 to 26, and ethylene oxide is added. The number is 5 to 20. The anionic surfactant is long-chain alkyl sulfonate, long-chain alkyl sulfate or long-chain alkyl benzene sulfonate, wherein the alkyl carbon number is 8 to 18, and the foam stabilizer is a low-carbon fatty amine or inorganic Ammonium salt.
雖然上述專利申請公開提出使用硫酸作為主要酸洗劑或是適用於不銹鋼的抑制劑。然而，工業上使用無機酸作為主要酸洗液進行金屬的結垢酸洗時，實際上仍會有些金屬材質上的限制。例如，鑄鐵具有特殊的金屬材質，在工業上也有特殊利用領域。在佩里化學工程師手冊(Perry's Chemical Engineers' Hand Book)的工具書中，指出鑄鐵不耐無機酸腐蝕。因此，在酸洗過程隨著濃度及溫度的提高，上述的抑制劑使用於鑄鐵上的效果並不甚理想。 Although the above patent application discloses the use of sulfuric acid as the main pickling agent or an inhibitor suitable for stainless steel. However, when industrially using mineral acid as the main acid pickling solution for the metal pickling and pickling, there are still some metal material limitations. For example, cast iron has a special metal material and is also used in the industrial field. In the tool book of Perry's Chemical Engineers' Hand Book, it is pointed out that cast iron is not resistant to inorganic acid corrosion. Therefore, the effect of the above inhibitors on cast iron is not ideal as the concentration and temperature increase in the pickling process.
故，有必要提供一種鑄鐵酸洗劑及鑄鐵酸洗腐蝕抑制劑，以解決習用技術所存在的問題。 Therefore, it is necessary to provide a cast iron pickling agent and a cast iron pickling corrosion inhibitor to solve the problems of the conventional technology.
本發明之主要目的在於提供一種鑄鐵酸洗劑及鑄鐵酸洗腐蝕抑制劑，其可以使用於鑄鐵上，特別是厚度較薄的鑄鐵鰭片，在基於優良酸洗除垢的條件，還可具備98.5%以上的抗腐蝕效果。 The main object of the present invention is to provide a cast iron pickling agent and a cast iron pickling corrosion inhibitor which can be used on cast iron, especially a cast iron fin having a small thickness, and can be provided under conditions of excellent pickling and descaling. More than 98.5% corrosion resistance.
為達上述之目的，本發明提供一種鑄鐵酸洗腐蝕抑制劑，其包含：1重量份至30重量份的甘油；1重量份至30重量份的胺類；1重量份至30重量份的鹵化物；及1重量份至30重量份的酸類。 To achieve the above object, the present invention provides a cast iron pickling corrosion inhibitor comprising: 1 part by weight to 30 parts by weight of glycerin; 1 part by weight to 30 parts by weight of an amine; 1 part by weight to 30 parts by weight of a halogenated And 1 part by weight to 30 parts by weight of an acid.
在本發明之一實施例中，胺類選自於乙二胺四乙酸、乙二胺、乙醇胺、三乙醇胺及六亞甲基四胺所組成的群組。 In one embodiment of the invention, the amine is selected from the group consisting of ethylenediaminetetraacetic acid, ethylenediamine, ethanolamine, triethanolamine, and hexamethylenetetramine.
在本發明之一實施例中，鹵化物選自於氯化亞銅、氯化鈉、氯化鉀、氯化鋅及碘化鉀所組成的群組。 In one embodiment of the invention, the halide is selected from the group consisting of cuprous chloride, sodium chloride, potassium chloride, zinc chloride, and potassium iodide.
在本發明之一實施例中，酸類選自於乙酸、丙酸、丁酸及草酸所組成的群組。 In one embodiment of the invention, the acid is selected from the group consisting of acetic acid, propionic acid, butyric acid, and oxalic acid.
在本發明之一實施例中，基於該鑄鐵酸洗腐蝕抑制劑的總重是100重量份，則該鑄鐵酸洗腐蝕抑制劑包含：1重量份至10重量份的甘油；1重量份至10重量份的胺類；1重量份至10重量份的鹵化物；1重量份至10重量份的酸類；及60重量份至 96重量份的水。 In one embodiment of the present invention, the cast iron pickling corrosion inhibitor comprises: 1 part by weight to 10 parts by weight of glycerin; 1 part by weight to 10, based on 100 parts by weight of the total weight of the cast iron pickling corrosion inhibitor Parts by weight of amine; 1 part by weight to 10 parts by weight of halide; 1 part by weight to 10 parts by weight of acid; and 60 parts by weight to 96 parts by weight of water.
為達上述之目的，本發明提供一種鑄鐵酸洗劑，其包含：1重量百分比至18重量百分比之一酸洗液，其中該酸洗液選自於鹽酸、硫酸及硝酸所組成的群組；及82重量百分比至99重量百分比之一鑄鐵酸洗腐蝕抑制劑，其中該鑄鐵酸洗腐蝕抑制劑包含：1重量份至30重量份的甘油；1重量份至30重量份的胺類；1重量份至30重量份的鹵化物；及1重量份至30重量份的酸類。 In order to achieve the above object, the present invention provides a cast iron pickling agent comprising: 1% by weight to 18% by weight of an acid pickling liquid, wherein the pickling liquid is selected from the group consisting of hydrochloric acid, sulfuric acid and nitric acid; And 82% by weight to 99% by weight of a cast iron pickling corrosion inhibitor, wherein the cast iron pickling corrosion inhibitor comprises: 1 part by weight to 30 parts by weight of glycerin; 1 part by weight to 30 parts by weight of the amine; 1 weight Parts to 30 parts by weight of a halide; and 1 part by weight to 30 parts by weight of an acid.
在本發明之一實施例中，胺類選自於乙二胺四乙酸、乙二胺、乙醇胺、三乙醇胺及六亞甲基四胺所組成的群組。 In one embodiment of the invention, the amine is selected from the group consisting of ethylenediaminetetraacetic acid, ethylenediamine, ethanolamine, triethanolamine, and hexamethylenetetramine.
在本發明之一實施例中，鹵化物選自於氯化亞銅、氯化鈉、氯化鉀、氯化鋅及碘化鉀所組成的群組。 In one embodiment of the invention, the halide is selected from the group consisting of cuprous chloride, sodium chloride, potassium chloride, zinc chloride, and potassium iodide.
在本發明之一實施例中，酸類選自於乙酸、丙酸、丁酸及草酸所組成的群組。 In one embodiment of the invention, the acid is selected from the group consisting of acetic acid, propionic acid, butyric acid, and oxalic acid.
在本發明之一實施例中，基於該鑄鐵酸洗腐蝕抑制劑的總重是100重量份，則該鑄鐵酸洗腐蝕抑制劑包含：1重量份至10重量份的甘油；1重量份至10重量份的胺類；1重量份至10重量份的鹵化物；1重量份至10重量份的酸類；及60重量份至96重量份的水。 In one embodiment of the present invention, the cast iron pickling corrosion inhibitor comprises: 1 part by weight to 10 parts by weight of glycerin; 1 part by weight to 10, based on 100 parts by weight of the total weight of the cast iron pickling corrosion inhibitor Parts by weight of the amine; 1 part by weight to 10 parts by weight of the halide; 1 part by weight to 10 parts by weight of the acid; and 60 parts by weight to 96 parts by weight of the water.
本發明實施例的鑄鐵酸洗腐蝕抑制劑包含1重量份至30重量份的甘油、1重量份至30重量份的胺類、1重量份至30重量份的鹵化物及1重量份至30重量份的酸類。在一實施例中，基於該鑄鐵酸洗腐蝕抑制劑的總重是100重量份，則該鑄鐵酸洗腐蝕抑制劑包含：1重量份至10重量份的甘油、1重量份至10重量份的胺類、1重量份至10重量份的鹵化物、1重量份至10重量份的酸類及60重量份至96重量份的水。 The cast iron pickling corrosion inhibitor of the embodiment of the present invention comprises 1 part by weight to 30 parts by weight of glycerin, 1 part by weight to 30 parts by weight of the amine, 1 part by weight to 30 parts by weight of the halide, and 1 part by weight to 30% by weight. A portion of the acid. In one embodiment, the cast iron pickling corrosion inhibitor comprises: 1 part by weight to 10 parts by weight of glycerin, and 1 part by weight to 10 parts by weight based on 100 parts by weight of the total weight of the cast iron pickling corrosion inhibitor An amine, 1 part by weight to 10 parts by weight of a halide, 1 part by weight to 10 parts by weight of an acid, and 60 parts by weight to 96 parts by weight of water.
在一實施例中，胺類選自於乙二胺四乙酸、乙二胺、乙醇胺、三乙醇胺及六亞甲基四胺所組成的群組。在另一實施例 中，鹵化物選自於氯化亞銅、氯化鈉、氯化鉀、氯化鋅及碘化鉀所組成的群組。在又一實施例中，酸類選自於乙酸、丙酸、丁酸及草酸所組成的群組。 In one embodiment, the amine is selected from the group consisting of ethylenediaminetetraacetic acid, ethylenediamine, ethanolamine, triethanolamine, and hexamethylenetetramine. In another embodiment The halide is selected from the group consisting of cuprous chloride, sodium chloride, potassium chloride, zinc chloride and potassium iodide. In yet another embodiment, the acid is selected from the group consisting of acetic acid, propionic acid, butyric acid, and oxalic acid.
另外，本發明實施例更提出一種鑄鐵酸洗劑，包含1重量百分比至18重量百分比之一酸洗液及82重量百分比至99重量百分比之一鑄鐵酸洗腐蝕抑制劑。該酸洗液選自於鹽酸、硫酸及硝酸所組成的群組。該鑄鐵酸洗腐蝕抑制劑包含：1重量份至30重量份的甘油、1重量份至30重量份的胺類、1重量份至30重量份的鹵化物及1重量份至30重量份的酸類。要提到的是，鑄鐵酸洗劑中所使用的鑄鐵酸洗腐蝕抑制劑中的胺類、鹵化物及酸類等成分可以參照上述本發明實施例中的具體實施例實施，故不再贅述。 In addition, an embodiment of the present invention further provides a cast iron pickling agent comprising 1% by weight to 18% by weight of an acid pickling liquid and 82% by weight to 99% by weight of a cast iron pickling corrosion inhibitor. The pickling liquid is selected from the group consisting of hydrochloric acid, sulfuric acid, and nitric acid. The cast iron pickling corrosion inhibitor comprises: 1 part by weight to 30 parts by weight of glycerin, 1 part by weight to 30 parts by weight of the amine, 1 part by weight to 30 parts by weight of the halide, and 1 part by weight to 30 parts by weight of the acid. . It is to be noted that the amines, halides, acids and the like in the cast iron pickling corrosion inhibitor used in the cast iron pickling agent can be carried out with reference to the specific examples in the above-described embodiments of the present invention, and therefore will not be described again.
本發明實施例的鑄鐵酸洗劑及鑄鐵酸洗腐蝕抑制劑，主要是使用在鑄鐵領域之中。更具體的，本發明實施例還可以用在厚度較薄的鑄鐵鰭片上，而不用擔心酸洗液腐蝕鑄鐵鰭片而使其結構受損。 The cast iron pickling agent and the cast iron pickling corrosion inhibitor of the embodiments of the present invention are mainly used in the field of cast iron. More specifically, the embodiments of the present invention can also be applied to cast iron fins having a thin thickness without fear of corrosion of the cast iron fins by the pickling solution.
一般而言，鑄鐵鰭片表面結垢的主要組成包含硫化鐵、氧化鐵及含鋅與鈣的氧化物。經過實驗測試，分別在200毫升的10wt%(重量百分比)的鹽酸、硫酸及硝酸等酸洗液中，加入10克的鑄鐵鰭片表面結垢，經長時間室溫下攪拌，10wt%鹽酸的結垢溶解率是82.61wt%；10wt%硫酸的結垢溶解率是76.32wt%；及10wt%硝酸的結垢溶解率是70.32wt%。要提到的是，取用10wt%的酸洗液是基於過高濃度的酸洗液可能會造成對鑄鐵鰭片過強的腐蝕效果。換言之，基於欲進行酸洗的鑄鐵的厚度或所摻雜的成分比例不同，本發明實施例的鑄鐵酸洗劑亦可取用低於10wt%或高於10wt%的酸洗液，例如在鑄鐵鰭片更薄的情況下，可採用1wt%、3wt%、5wt%、7wt%或9wt%的鹽酸、硫酸或硝酸作為酸洗液；或者在進行鑄鐵塊材的酸洗時，可採用11wt%、13wt%、15wt%、17wt%或19wt%的鹽酸、硫酸或硝酸作為酸洗液。 In general, the main components of scale formation on cast iron fins include iron sulfide, iron oxide, and oxides containing zinc and calcium. After experimental tests, 10 g of cast iron fins were added to the surface of 200 ml of 10 wt% hydrochloric acid, sulfuric acid and nitric acid, and the surface was stirred at room temperature for a long time, 10 wt% hydrochloric acid. The fouling dissolution rate was 82.61 wt%; the fouling dissolution rate of 10 wt% sulfuric acid was 76.32 wt%; and the fouling dissolution rate of 10 wt% nitric acid was 70.32 wt%. It should be mentioned that the use of 10% by weight of the pickling solution is based on an excessively high concentration of pickling solution which may cause excessive corrosion of the cast iron fins. In other words, the cast iron pickling agent of the embodiment of the present invention may also use an acid pickling liquid of less than 10% by weight or more than 10% by weight, for example, in cast iron fins, depending on the thickness of the cast iron to be pickled or the proportion of the component to be doped. In the case where the sheet is thinner, 1 wt%, 3 wt%, 5 wt%, 7 wt% or 9 wt% hydrochloric acid, sulfuric acid or nitric acid may be used as the pickling liquid; or when the cast iron block is pickled, 11 wt% may be used. 13 wt%, 15 wt%, 17 wt% or 19 wt% hydrochloric acid, sulfuric acid or nitric acid is used as the acid wash.
值得一提的是，本發明實施例的鑄鐵酸洗劑及鑄鐵酸洗腐蝕抑制劑中不包含甲酸，因為甲酸與鑄鐵成分所產生的結垢接觸並經加熱之後會產生一氧化碳有毒氣體，提高現場作業人員的危險性。 It is worth mentioning that the cast iron pickling agent and the cast iron pickling corrosion inhibitor of the embodiment of the invention do not contain formic acid, because the formic acid is in contact with the scale generated by the cast iron component and is heated to generate carbon monoxide toxic gas, thereby improving the site. The danger of the operator.
以下將提出數個實施例證明本發明實施例的鑄鐵酸洗劑及鑄鐵酸洗腐蝕抑制劑具備優良腐蝕抑制效果。 Several embodiments will be exemplified below to demonstrate that the cast iron pickling agent and the cast iron pickling corrosion inhibitor of the examples of the present invention have excellent corrosion inhibiting effects.
實施例1 Example 1
在常溫常壓下，將1重量份的乙二胺四乙酸及1重量份的碘化鉀溶解於96重量份的水中，再加入1重量份的甘油及1重量份的丙酸，經過均勻混合後並靜置一小時後，即完成鑄鐵酸洗腐蝕抑制劑的製備。之後，取用實施例1中配置的鑄鐵酸洗腐蝕抑制劑5重量份加到95重量份鹽酸(鹽酸濃度為10wt%)，經過均勻混合後即完成實施例1的鑄鐵酸洗劑的配製。 1 part by weight of ethylenediaminetetraacetic acid and 1 part by weight of potassium iodide are dissolved in 96 parts by weight of water under normal temperature and normal pressure, and then 1 part by weight of glycerin and 1 part by weight of propionic acid are added, and after uniformly mixing, After standing for one hour, the preparation of the cast iron pickling corrosion inhibitor was completed. Thereafter, 5 parts by weight of the cast iron pickling corrosion inhibitor disposed in Example 1 was added to 95 parts by weight of hydrochloric acid (hydrochloric acid concentration: 10% by weight), and after uniformly mixing, the preparation of the cast iron pickling agent of Example 1 was completed.
實施例2 Example 2
在常溫常壓下，將10重量份的乙二胺四乙酸及10重量份的碘化鉀溶解於60重量份的水中，再加入10重量份的甘油及10重量份的丙酸，經過均勻混合後並靜置一小時後，即完成鑄鐵酸洗腐蝕抑制劑的製備。之後，取用實施例2中配置的鑄鐵酸洗腐蝕抑制劑5重量份，加到95重量份的鹽酸(鹽酸濃度為10wt%)內，經過均勻混合後即完成實施例2的鑄鐵酸洗劑的配製。 10 parts by weight of ethylenediaminetetraacetic acid and 10 parts by weight of potassium iodide are dissolved in 60 parts by weight of water under normal temperature and normal pressure, and then 10 parts by weight of glycerin and 10 parts by weight of propionic acid are added, and after uniformly mixing, After standing for one hour, the preparation of the cast iron pickling corrosion inhibitor was completed. Thereafter, 5 parts by weight of the cast iron pickling corrosion inhibitor disposed in Example 2 was taken, and 95 parts by weight of hydrochloric acid (concentration of hydrochloric acid was 10% by weight) was added, and after uniformly mixing, the cast iron pickling agent of Example 2 was completed. Preparation.
實施例3 Example 3
在常溫常壓下，將1重量份的六亞甲基四胺及1重量份的氯化亞銅溶解於96重量份的水中，再加入1重量份的甘油及1重量份的乙酸，經過均勻混合後並靜置一小時後，即完成鑄鐵酸洗腐蝕抑制劑的製備。之後，取用實施例3中配置的鑄鐵酸洗腐蝕抑制劑5重量份加到95重量份鹽酸(鹽酸濃度為10wt%)，經過均勻混合後即完成實施例3的鑄鐵酸洗劑的配製。 1 part by weight of hexamethylenetetramine and 1 part by weight of cuprous chloride are dissolved in 96 parts by weight of water under normal temperature and normal pressure, and then 1 part by weight of glycerin and 1 part by weight of acetic acid are added, and uniform After mixing and standing for one hour, the preparation of the cast iron pickling corrosion inhibitor was completed. Thereafter, 5 parts by weight of the cast iron pickling corrosion inhibitor disposed in Example 3 was added to 95 parts by weight of hydrochloric acid (hydrochloric acid concentration: 10% by weight), and after uniformly mixing, the cast iron pickling agent of Example 3 was completed.
實施例4 Example 4
在常溫常壓下，將10重量份的六亞甲基四胺及10 重量份的氯化亞銅溶解於60重量份的水中，再加入10重量份的甘油及10重量份的乙酸，經過均勻混合後並靜置一小時後，即完成鑄鐵酸洗腐蝕抑制劑的製備。之後，取用實施例4中配置的鑄鐵酸洗腐蝕抑制劑5重量份，加到95重量份的鹽酸(鹽酸濃度為10wt%)內，經過均勻混合後即完成實施例4的鑄鐵酸洗劑的配製。 10 parts by weight of hexamethylenetetramine and 10 at normal temperature and pressure The parts by weight of cuprous chloride are dissolved in 60 parts by weight of water, 10 parts by weight of glycerin and 10 parts by weight of acetic acid are added, and after uniformly mixing and allowed to stand for one hour, the preparation of the cast iron pickling corrosion inhibitor is completed. . Thereafter, 5 parts by weight of the cast iron pickling corrosion inhibitor disposed in Example 4 was taken, and 95 parts by weight of hydrochloric acid (concentration of hydrochloric acid: 10% by weight) was added, and after uniformly mixing, the cast iron pickling agent of Example 4 was completed. Preparation.
評價方法是，提供四個無結垢的鑄鐵鰭片並稱重記錄，分別加到已加熱至攝氏80度的實施例1至4的鑄鐵酸洗劑中。經過30分鐘後，將浸入實施例1至4的鑄鐵酸洗劑中的四個鑄鐵鰭片取出並分別稱重記錄。經過計算比較後，發現浸入實施例1後的鑄鐵鰭片與浸入前的鑄鐵鰭片重量相比剩下98.5wt%，且外觀無穿孔或明顯腐蝕，所以可證明實施例1具備優良腐蝕抑制效果。同樣的，實施例2至4的鑄鐵鰭片分別剩下98.7wt%、99.1wt%及99.5wt%，且外觀無穿孔或明顯腐蝕，所以可證明實施例2至4亦具備優良腐蝕抑制效果。另外要提到的是，實際運用實施例1至4的鑄鐵酸洗劑來酸洗鑄鐵鰭片的表面結垢時，仍具有優良的除垢效果。 The evaluation method was to provide four non-fouling cast iron fins and weigh and record them into the cast iron pickling agents of Examples 1 to 4 which had been heated to 80 degrees Celsius, respectively. After 30 minutes, the four cast iron fins immersed in the cast iron pickling agents of Examples 1 to 4 were taken out and weighed separately. After calculation and comparison, it was found that the cast iron fins immersed in Example 1 had a balance of 98.5 wt% compared with the weight of the cast iron fins before immersion, and the appearance was free from perforation or obvious corrosion, so that Example 1 was proved to have excellent corrosion inhibition effect. . Similarly, the cast iron fins of Examples 2 to 4 were left with 98.7 wt%, 99.1 wt%, and 99.5% by weight, respectively, and the appearance was free from perforation or significant corrosion, so that Examples 2 to 4 were also confirmed to have excellent corrosion inhibition effects. In addition, it is mentioned that the cast iron pickling agents of Examples 1 to 4 are actually used to pickle the surface scale of the cast iron fins, and still have an excellent descaling effect.
綜上所述，本發明實施例的鑄鐵酸洗劑及鑄鐵酸洗腐蝕抑制劑可以使用於鑄鐵上，特別是厚度較薄的鑄鐵鰭片，在基於優良酸洗除垢的條件，還可具備98.5%以上的抗腐蝕效果。 In summary, the cast iron pickling agent and the cast iron pickling corrosion inhibitor of the embodiment of the present invention can be used on cast iron, especially the cast iron fins having a thin thickness, and can be provided under conditions of excellent pickling and descaling. More than 98.5% corrosion resistance.
雖然本發明已以較佳實施例揭露，然其並非用以限制本發明，任何熟習此項技藝之人士，在不脫離本發明之精神和範圍內，當可作各種更動與修飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。 The present invention has been disclosed in its preferred embodiments, and is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.
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