JP2013245391A - Electrolyte for electrolytic polishing - Google Patents
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本発明は、ステンレス鋼に代表される含クロム合金鋼の溶接によって発生する溶接焼けを除去する際に使用される電解研磨用電解液に関する。 The present invention relates to an electrolytic solution for electropolishing used for removing welding burns generated by welding of a chromium-containing alloy steel typified by stainless steel.
ステンレス鋼を溶接すると、溶接部周辺に溶接焼け（酸化スケール）が発生するため、従来から電解研磨による溶接焼け取りが行われている。電解研磨に用いられる電解液は市販されているものの、従来の電解液では完全に焼けを除去することが困難であった。溶接焼けが残ると、溶接部分の跡が残るため、見栄えが悪く、商品価値を低下させてしまう。 When stainless steel is welded, welding burn (oxidation scale) is generated around the welded portion, so that welding burn-off has been conventionally performed by electrolytic polishing. Although an electrolytic solution used for electropolishing is commercially available, it has been difficult to completely remove the burn with the conventional electrolytic solution. If the welding burn remains, the mark of the welded portion remains, so that the appearance is bad and the commercial value is lowered.
一方、強酸性の電解液を使用することで、溶接焼けを綺麗に除去することができるものの、強酸を使用すると、強酸性溶液が作業者の体に飛散して薬傷を負ってしまうといった危険性があった。また、工業用水の排水基準（ｐＨ５．８〜８．６）を満たすため、焼け取り終了後に大量のアルカリを用いて電解液を中和する必要があった。 On the other hand, the use of a strong acid electrolyte can remove weld burns cleanly, but the use of a strong acid may cause the strong acid solution to splash on the operator's body and cause chemical injury. There was sex. Moreover, in order to satisfy the industrial water drainage standard (pH 5.8 to 8.6), it was necessary to neutralize the electrolyte solution using a large amount of alkali after scorching.
このような問題に鑑み、下記特許文献１には、硫酸、燐酸、硝酸のカリウムやナトリウム塩の水溶液にアスコルビン酸又はその塩を添加した、中性の含クロム合金鋼の電解研磨用電解液が開示されている。
In view of such problems,
しかし、アスコルビン酸は、ビタミンＣとしての働きも知られ、医薬品にも用いられていることから高価であり、電解研磨用電解液に使用するにはコストの問題があった。 However, ascorbic acid is known to function as vitamin C and is also used in pharmaceuticals, so it is expensive and has a problem of cost when used in an electrolytic solution for electropolishing.
本発明は、このような課題に鑑みてなされたものであり、電解研磨作業の危険性が低く、排水基準の範囲内で使用できる安価な電解研磨用電解液であって、含クロム合金鋼の溶接焼けを綺麗に除去できる電解研磨用電解液を提供することを目的とする。 The present invention has been made in view of such problems, and is an inexpensive electrolytic polishing electrolytic solution that has a low risk of electrolytic polishing work and can be used within the range of drainage standards. An object of the present invention is to provide an electrolytic solution for electropolishing that can cleanly remove weld burn.
上記課題を解決するために、本発明に係る電解研磨用電解液は、含クロム合金鋼の電解研磨に用いられる電解研磨用電解液において、リン酸二水素カリウムと、リン酸水素二カリウムと、クエン酸と、クエン酸ナトリウムと、を含む水溶液であることを特徴とする。 In order to solve the above problems, an electrolytic solution for electrolytic polishing according to the present invention is an electrolytic solution for electrolytic polishing used for electrolytic polishing of chromium-containing alloy steel, in which potassium dihydrogen phosphate, dipotassium hydrogen phosphate, It is an aqueous solution containing citric acid and sodium citrate.
本発明に係る電解研磨用電解液によれば、排水基準の範囲内で安全に電解研磨作業を行うことができ、含クロム合金鋼の溶接焼けを綺麗に除去することができる。 According to the electrolytic polishing electrolytic solution according to the present invention, it is possible to safely perform the electrolytic polishing within the range of the drainage standard, and to cleanly remove the weld burn of the chromium-containing alloy steel.
以下、本発明の実施の形態を図面に基づいて説明する。ただし、以下に示す実施の形態は、本発明の技術思想を具体化するための電解研磨用電解液を例示するものであって、本発明は電解研磨用電解液を以下のものに特定しない。また、特許請求の範囲に示される部材を、実施の形態の部材に特定するものでは決してない。特に実施の形態に記載されている構成部材の寸法、材質、形状、その相対的配置等は特に特定的な記載がない限りは、本発明の範囲をそれのみに限定する趣旨ではなく、単なる説明例にすぎない。さらに以下の説明において、同一の名称、符号については同一もしくは同質の部材を示しており、詳細説明を適宜省略する。さらに、本発明を構成する各要素は、複数の要素を同一の部材で構成して一の部材で複数の要素を兼用する態様としてもよいし、逆に一の部材の機能を複数の部材で分担して実現することもできる。また、一部の実施例、実施形態において説明された内容は、他の実施例、実施形態等に利用可能なものもある。
図１は、本実施形態に係る電解研磨用電解液の実施例１〜２３を示す図である。本実施形態では、１０ｃｍ×１０ｃｍの正方形状のステンレス鋼板材に溶接により発生した溶接焼け（中心を通る長さ１０ｃｍの直線）を直流法の電解研磨により除去する場合を例に挙げて説明する。
Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies an electrolytic polishing electrolytic solution for embodying the technical idea of the present invention, and the present invention does not specify the electrolytic polishing electrolytic solution as follows. Moreover, the member shown by the claim is not what specifies the member of embodiment. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention only to the description unless otherwise specified. It is just an example. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In addition, the contents described in some examples and embodiments may be used in other examples and embodiments.
FIG. 1 is a diagram showing Examples 1 to 23 of the electrolytic polishing electrolytic solution according to the present embodiment. In the present embodiment, an example will be described in which welding burn (a straight line having a length of 10 cm passing through the center) generated by welding on a 10 cm × 10 cm square stainless steel plate material is removed by electrolytic polishing using a direct current method.
本実施形態の電解研磨作業においては、１５Ｖの直流電圧を印加する電源器の陰極側にステンレス鋼を接続し、陽極側の金属に電解研磨用電解液を含浸した布を取り付け、この布でステンレス鋼表面をなぞることで、溶接焼けの除去を行った。 In the electropolishing operation of the present embodiment, stainless steel is connected to the cathode side of a power supply device that applies a DC voltage of 15 V, and a cloth impregnated with an electrolytic solution for electropolishing is attached to the metal on the anode side. The weld burn was removed by tracing the steel surface.
図１に示すように、実施例１〜２３では、電解研磨用電解液全体で１００ｇとなるように電解液の原料を配合している。「焼け取り時間（秒）」は、溶接焼けが綺麗に除去できるまでに要した時間を示しており、「ビード部」は、ビード部（溶接跡）の焼けの除去に要した時間、「全体」は、ステンレス鋼の表面全体の焼けの除去に要した時間を示している。 As shown in FIG. 1, in Examples 1-23, the raw material of electrolyte solution is mix | blended so that it may become 100g with the whole electrolyte solution for electropolishing. “Burn time (seconds)” indicates the time required until the weld burn can be removed cleanly. “Bead part” indicates the time required to remove the burn on the bead part (weld mark). "" Indicates the time required to remove the burn on the entire surface of the stainless steel.
本実施形態に係る電解研磨用電解液は、原料である水、リン酸二水素カリウム（ＫＨ2ＰＯ4）、リン酸水素二カリウム（Ｋ2ＨＰＯ4）、クエン酸及びクエン酸ナトリウムを所定の質量配合比で混合し、スターラーで撹拌することで生成したことを特徴としており、実施例１〜２３に係る電解液を用いた電解研磨によれば、溶接焼けを短時間で綺麗に除去することができた。以下、実施例１〜２３について、それぞれ詳細に説明する。 The electrolytic solution for electropolishing according to the present embodiment contains water, potassium dihydrogen phosphate (KH 2 PO 4 ), dipotassium hydrogen phosphate (K 2 HPO 4 ), citric acid, and sodium citrate as raw materials. It is characterized by being produced by mixing at a mass blending ratio and stirring with a stirrer, and according to electropolishing using the electrolytic solution according to Examples 1 to 23, welding burns can be removed cleanly in a short time. I was able to. Hereinafter, Examples 1 to 23 will be described in detail.
実施例１は、水８４ｇと、リン酸二水素カリウム（ＫＨ2ＰＯ4）７ｇと、リン酸水素二カリウム（Ｋ2ＨＰＯ4）７ｇと、クエン酸１ｇと、クエン酸ナトリウム１ｇとを配合した電解液であり、当該電解液のｐＨは６．０５であった。実施例１の焼け取り時間は、ビード部が７秒、全体で３６秒であり、溶接焼け除去後の表面は非常に綺麗であった。
実施例２は、水８２ｇと、リン酸二水素カリウム７ｇと、リン酸水素二カリウム７ｇと、クエン酸１ｇと、クエン酸ナトリウム３ｇとを配合した電解液であり、当該電解液のｐＨは６．１７であった。実施例２の焼け取り時間は、ビード部が７秒、全体で３５秒であり、溶接焼け除去後の表面は非常に綺麗であった。
In Example 1, 84 g of water, 7 g of potassium dihydrogen phosphate (KH 2 PO 4 ), 7 g of dipotassium hydrogen phosphate (K 2 HPO 4 ), 1 g of citric acid, and 1 g of sodium citrate were blended. The electrolyte solution had a pH of 6.05. The burn-out time of Example 1 was 7 seconds for the bead portion and 36 seconds as a whole, and the surface after removal of the weld burn was very clean.
Example 2 is an electrolytic solution containing 82 g of water, 7 g of potassium dihydrogen phosphate, 7 g of dipotassium hydrogen phosphate, 1 g of citric acid, and 3 g of sodium citrate, and the pH of the electrolytic solution is 6 .17. The burn-out time of Example 2 was 7 seconds for the bead portion and 35 seconds as a whole, and the surface after removal of the weld burn was very clean.
実施例３は、水８４．５ｇと、リン酸二水素カリウム７ｇと、リン酸水素二カリウム７ｇと、クエン酸１ｇと、クエン酸ナトリウム０．５ｇとを配合した電解液であり、当該電解液のｐＨは６．２１であった。実施例３の焼け取り時間は、ビード部が１２秒、全体で３４秒であり、溶接焼け除去後の表面は非常に綺麗であった。
実施例４は、水８４．３ｇと、リン酸二水素カリウム７ｇと、リン酸水素二カリウム７ｇと、クエン酸１ｇと、クエン酸ナトリウム０．７ｇとを混合した電解液であり、当該電解液のｐＨは６．１９であった。実施例４の焼け取り時間は、ビード部が３秒、全体で３７秒であり、溶接焼け除去後の表面は非常に綺麗であった。
Example 3 is an electrolytic solution containing 84.5 g of water, 7 g of potassium dihydrogen phosphate, 7 g of dipotassium hydrogen phosphate, 1 g of citric acid, and 0.5 g of sodium citrate. The pH of was 6.21. The burn-out time of Example 3 was 12 seconds for the bead portion and 34 seconds as a whole, and the surface after removing the weld burn was very clean.
Example 4 is an electrolytic solution obtained by mixing 84.3 g of water, 7 g of potassium dihydrogen phosphate, 7 g of dipotassium hydrogen phosphate, 1 g of citric acid, and 0.7 g of sodium citrate. The pH of was 6.19. The burn-out time of Example 4 was 3 seconds for the bead portion and 37 seconds in total, and the surface after removal of the weld burn was very clean.
実施例５は、水９０ｇと、リン酸二水素カリウム４ｇと、リン酸水素二カリウム４ｇと、クエン酸１ｇと、クエン酸ナトリウム１ｇとを配合した電解液であり、当該電解液のｐＨは５．９８であった。実施例５の焼け取り時間は、ビード部が７秒、全体で７７秒であり、溶接焼け除去後の表面は非常に綺麗であった。
実施例６は、水８８ｇと、リン酸二水素カリウム５ｇと、リン酸水素二カリウム５ｇと、クエン酸１ｇと、クエン酸ナトリウム１ｇとを混合した電解液であり、当該電解液のｐＨは６．１１であった。実施例６の焼け取り時間は、ビード部が８秒、全体で６０秒であり、溶接焼け除去後の表面は非常に綺麗であった。
Example 5 is an electrolytic solution containing 90 g of water, 4 g of potassium dihydrogen phosphate, 4 g of dipotassium hydrogen phosphate, 1 g of citric acid, and 1 g of sodium citrate, and the pH of the electrolytic solution is 5 .98. The burn-out time of Example 5 was 7 seconds for the bead portion and 77 seconds in total, and the surface after removal of the weld burn was very clean.
Example 6 is an electrolytic solution in which 88 g of water, 5 g of potassium dihydrogen phosphate, 5 g of dipotassium hydrogen phosphate, 1 g of citric acid, and 1 g of sodium citrate are mixed, and the pH of the electrolytic solution is 6 .11. The burn-out time of Example 6 was 8 seconds for the bead part, and 60 seconds in total, and the surface after removal of the weld burn was very clean.
実施例７は、水８６ｇと、リン酸二水素カリウム６ｇと、リン酸水素二カリウム６ｇと、クエン酸１ｇと、クエン酸ナトリウム１ｇとを混合した電解液であり、当該電解液のｐＨは６．１８であった。実施例７の焼け取り時間は、ビード部が８秒、全体で６０秒であり、溶接焼け除去後の表面は非常に綺麗であった。
実施例８は、水８２ｇと、リン酸二水素カリウム８ｇと、リン酸水素二カリウム８ｇと、クエン酸１ｇと、クエン酸ナトリウム１ｇとを混合した電解液であり、当該電解液のｐＨは６．２６であった。実施例８の焼け取り時間は、ビード部が１３秒、全体で４１秒であり、溶接焼け除去後の表面は非常に綺麗であった。
Example 7 is an electrolytic solution obtained by mixing 86 g of water, 6 g of potassium dihydrogen phosphate, 6 g of dipotassium hydrogen phosphate, 1 g of citric acid, and 1 g of sodium citrate, and the pH of the electrolytic solution is 6 .18. The burn-out time of Example 7 was 8 seconds for the bead part and 60 seconds in total, and the surface after removal of the weld burn was very clean.
Example 8 is an electrolytic solution obtained by mixing 82 g of water, 8 g of potassium dihydrogen phosphate, 8 g of dipotassium hydrogen phosphate, 1 g of citric acid, and 1 g of sodium citrate, and the pH of the electrolytic solution is 6 .26. The burn-out time of Example 8 was 13 seconds for the bead portion and 41 seconds in total, and the surface after removal of the weld burn was very clean.
実施例９は、水８０ｇと、リン酸二水素カリウム９ｇと、リン酸水素二カリウム９ｇと、クエン酸１ｇと、クエン酸ナトリウム１ｇとを混合した電解液であり、当該電解液のｐＨは６．２７であった。実施例９の焼け取り時間は、ビード部が８秒、全体で３３秒であり、溶接焼け除去後の表面は非常に綺麗であった。
実施例１０は、水７８ｇと、リン酸二水素カリウム１０ｇと、リン酸水素二カリウム１０ｇと、クエン酸１ｇと、クエン酸ナトリウム１ｇとを混合した電解液であり、当該電解液のｐＨは６．２９であった。実施例１０の焼け取り時間は、ビード部が６秒、全体で３６秒であり、溶接焼け除去後の表面は非常に綺麗であった。
Example 9 is an electrolytic solution in which 80 g of water, 9 g of potassium dihydrogen phosphate, 9 g of dipotassium hydrogen phosphate, 1 g of citric acid, and 1 g of sodium citrate are mixed, and the pH of the electrolytic solution is 6 .27. The burn-out time of Example 9 was 8 seconds for the bead portion and 33 seconds in total, and the surface after removal of the weld burn was very clean.
Example 10 is an electrolytic solution in which 78 g of water, 10 g of potassium dihydrogen phosphate, 10 g of dipotassium hydrogen phosphate, 1 g of citric acid, and 1 g of sodium citrate are mixed, and the pH of the electrolytic solution is 6 .29. The burn-out time of Example 10 was 6 seconds for the bead portion and 36 seconds in total, and the surface after removal of the weld burn was very clean.
実施例１１は、水８１ｇと、リン酸二水素カリウム９ｇと、リン酸水素二カリウム９ｇと、クエン酸０．５ｇと、クエン酸ナトリウム０．５ｇとを混合した電解液であり、当該電解液のｐＨは６．４６であった。実施例１１の焼け取り時間は、ビード部が７秒、全体で２６秒であり、溶接焼け除去後の表面は非常に綺麗であった。
実施例１２は、水７８ｇと、リン酸二水素カリウム９ｇと、リン酸水素二カリウム９ｇと、クエン酸２ｇと、クエン酸ナトリウム２ｇとを混合した電解液であり、当該電解液のｐＨは５．９４であった。実施例１２の焼け取り時間は、ビード部が１２秒、全体で２５秒であり、溶接焼け除去後の表面は非常に綺麗であった。
Example 11 is an electrolytic solution obtained by mixing 81 g of water, 9 g of potassium dihydrogen phosphate, 9 g of dipotassium hydrogen phosphate, 0.5 g of citric acid, and 0.5 g of sodium citrate. The pH of was 6.46. The burn-out time of Example 11 was 7 seconds for the bead portion and 26 seconds in total, and the surface after removal of the weld burn was very clean.
Example 12 is an electrolytic solution in which 78 g of water, 9 g of potassium dihydrogen phosphate, 9 g of dipotassium hydrogen phosphate, 2 g of citric acid, and 2 g of sodium citrate are mixed, and the pH of the electrolytic solution is 5 .94. The burn-out time of Example 12 was 12 seconds for the bead part and 25 seconds in total, and the surface after removal of the weld burn was very clean.
実施例１３は、水８０ｇと、リン酸二水素カリウム９ｇと、リン酸水素二カリウム９ｇと、クエン酸０．５ｇと、クエン酸ナトリウム１．５ｇとを混合した電解液であり、当該電解液のｐＨは６．４７であった。実施例１３の焼け取り時間は、ビード部が７秒、全体で３４秒であり、溶接焼け除去後の表面は非常に綺麗であった。
実施例１４は、水７９ｇと、リン酸二水素カリウム９ｇと、リン酸水素二カリウム９ｇと、クエン酸１ｇと、クエン酸ナトリウム２ｇとを混合した電解液であり、当該電解液のｐＨは６．２９であった。実施例１４の焼け取り時間は、ビード部が９秒、全体で３４秒であり、溶接焼け除去後の表面は非常に綺麗であった。
Example 13 is an electrolytic solution obtained by mixing 80 g of water, 9 g of potassium dihydrogen phosphate, 9 g of dipotassium hydrogen phosphate, 0.5 g of citric acid, and 1.5 g of sodium citrate. The pH of was 6.47. The burn-out time of Example 13 was 7 seconds for the bead portion and 34 seconds as a whole, and the surface after removal of the weld burn was very clean.
Example 14 is an electrolytic solution in which 79 g of water, 9 g of potassium dihydrogen phosphate, 9 g of dipotassium hydrogen phosphate, 1 g of citric acid, and 2 g of sodium citrate are mixed, and the pH of the electrolytic solution is 6 .29. The burn-out time of Example 14 was 9 seconds for the bead portion and 34 seconds as a whole, and the surface after removal of the weld burn was very clean.
実施例１５は、水７９ｇと、リン酸二水素カリウム９ｇと、リン酸水素二カリウム９ｇと、クエン酸２ｇと、クエン酸ナトリウム１ｇとを混合した電解液であり、当該電解液のｐＨは５．９４であった。実施例１５の焼け取り時間は、ビード部が８秒、全体で３０秒であり、溶接焼け除去後の表面は非常に綺麗であった。
実施例１６は、水８０ｇと、リン酸二水素カリウム９ｇと、リン酸水素二カリウム９ｇと、クエン酸１．５ｇと、クエン酸ナトリウム０．５ｇとを混合した電解液であり、当該電解液のｐＨは６．０９であった。実施例１６の焼け取り時間は、ビード部が９秒、全体で３０秒であり、溶接焼け除去後の表面は非常に綺麗であった。
Example 15 is an electrolytic solution in which 79 g of water, 9 g of potassium dihydrogen phosphate, 9 g of dipotassium hydrogen phosphate, 2 g of citric acid, and 1 g of sodium citrate are mixed, and the pH of the electrolytic solution is 5 .94. The burn-out time of Example 15 was 8 seconds for the bead portion and 30 seconds as a whole, and the surface after removal of the weld burn was very clean.
Example 16 is an electrolytic solution obtained by mixing 80 g of water, 9 g of potassium dihydrogen phosphate, 9 g of dipotassium hydrogen phosphate, 1.5 g of citric acid, and 0.5 g of sodium citrate. The pH of the was 6.09. The burn-out time of Example 16 was 9 seconds for the bead portion and 30 seconds in total, and the surface after removal of the weld burn was very clean.
実施例１７は、水８３ｇと、リン酸二水素カリウム８ｇと、リン酸水素二カリウム８ｇと、クエン酸０．５ｇと、クエン酸ナトリウム０．５ｇとを混合した電解液であり、当該電解液のｐＨは６．５０であった。実施例１７の焼け取り時間は、ビード部が１５秒、全体で３５秒であり、溶接焼け除去後の表面は非常に綺麗であった。
実施例１８は、水８０ｇと、リン酸二水素カリウム８ｇと、リン酸水素二カリウム８ｇと、クエン酸２ｇと、クエン酸ナトリウム２ｇとを混合した電解液であり、当該電解液のｐＨは５．９０であった。実施例１８の焼け取り時間は、ビード部が１６秒、全体で３４秒であり、溶接焼け除去後の表面は非常に綺麗であった。
Example 17 is an electrolytic solution obtained by mixing 83 g of water, 8 g of potassium dihydrogen phosphate, 8 g of dipotassium hydrogen phosphate, 0.5 g of citric acid, and 0.5 g of sodium citrate. The pH of was 6.50. The burn-out time of Example 17 was 15 seconds for the bead portion and 35 seconds as a whole, and the surface after removal of the weld burn was very clean.
Example 18 is an electrolytic solution in which 80 g of water, 8 g of potassium dihydrogen phosphate, 8 g of dipotassium hydrogen phosphate, 2 g of citric acid, and 2 g of sodium citrate are mixed, and the pH of the electrolytic solution is 5 .90. The burn-out time of Example 18 was 16 seconds for the bead portion and 34 seconds as a whole, and the surface after removal of the weld burn was very clean.
実施例１９は、水７４ｇと、リン酸二水素カリウム１２ｇと、リン酸水素二カリウム１２ｇと、クエン酸１ｇと、クエン酸ナトリウム１ｇとを混合した電解液であり、当該電解液のｐＨは６．４２であった。実施例１９の焼け取り時間は、ビード部が９秒、全体で４０秒であり、溶接焼け除去後の表面は非常に綺麗であった。
実施例２０は、水７０ｇと、リン酸二水素カリウム１４ｇと、リン酸水素二カリウム１４ｇと、クエン酸１ｇと、クエン酸ナトリウム１ｇとを混合した電解液であり、当該電解液のｐＨは６．４６であった。実施例２０の焼け取り時間は、ビード部が１０秒、全体で４０秒であり、溶接焼け除去後の表面は非常に綺麗であった。
Example 19 is an electrolytic solution in which 74 g of water, 12 g of potassium dihydrogen phosphate, 12 g of dipotassium hydrogen phosphate, 1 g of citric acid, and 1 g of sodium citrate are mixed, and the pH of the electrolytic solution is 6 .42. The burn-out time of Example 19 was 9 seconds for the bead portion and 40 seconds as a whole, and the surface after removal of the weld burn was very clean.
Example 20 is an electrolytic solution in which 70 g of water, 14 g of potassium dihydrogen phosphate, 14 g of dipotassium hydrogen phosphate, 1 g of citric acid, and 1 g of sodium citrate are mixed, and the pH of the electrolytic solution is 6 .46. The burn-out time of Example 20 was 10 seconds for the bead part and 40 seconds as a whole, and the surface after removal of the weld burn was very clean.
実施例２１は、水８０ｇと、リン酸二水素カリウム４ｇと、リン酸水素二カリウム１４ｇと、クエン酸１ｇと、クエン酸ナトリウム１ｇとを混合した電解液であり、当該電解液のｐＨは７．１２であった。実施例２１の焼け取り時間は、ビード部が９秒、全体で３８秒であり、溶接焼け除去後の表面は非常に綺麗であった。
実施例２２は、水８１．８ｇと、リン酸二水素カリウム９ｇと、リン酸水素二カリウム９ｇと、クエン酸０．１ｇと、クエン酸ナトリウム０．１ｇとを混合した電解液であり、当該電解液のｐＨは６．６５であった。実施例２０の焼け取り時間は、ビード部が６秒、全体で４５秒であり、溶接焼け除去後の表面は非常に綺麗であった。
Example 21 is an electrolytic solution in which 80 g of water, 4 g of potassium dihydrogen phosphate, 14 g of dipotassium hydrogen phosphate, 1 g of citric acid, and 1 g of sodium citrate are mixed, and the pH of the electrolytic solution is 7 .12. The burn-out time of Example 21 was 9 seconds for the bead portion and 38 seconds in total, and the surface after removal of the weld burn was very clean.
Example 22 is an electrolytic solution obtained by mixing 81.8 g of water, 9 g of potassium dihydrogen phosphate, 9 g of dipotassium hydrogen phosphate, 0.1 g of citric acid, and 0.1 g of sodium citrate. The pH of the electrolytic solution was 6.65. The burn-out time of Example 20 was 6 seconds for the bead portion and 45 seconds as a whole, and the surface after removal of the weld burn was very clean.
実施例２３は、水９１．８ｇと、リン酸二水素カリウム４ｇと、リン酸水素二カリウム４ｇと、クエン酸０．１ｇと、クエン酸ナトリウム０．１ｇとを混合した電解液であり、当該電解液のｐＨは６．６９であった。実施例２３の焼け取り時間は、ビード部が１４秒、全体で５４秒であり、溶接焼け除去後の表面は非常に綺麗であった。 Example 23 is an electrolytic solution in which 91.8 g of water, 4 g of potassium dihydrogen phosphate, 4 g of dipotassium hydrogen phosphate, 0.1 g of citric acid, and 0.1 g of sodium citrate are mixed. The pH of the electrolytic solution was 6.69. The burn-out time of Example 23 was 14 seconds for the bead portion and 54 seconds as a whole, and the surface after removal of the weld burn was very clean.
以上、焼け取りを適切に行うことのできた電解研磨用電解液の各実施例について説明したが、続いて、リン酸二水素カリウム、リン酸水素二カリウム、クエン酸、クエン酸ナトリウムの好適な配合量について、さらに図２を参照しながら説明する。図２は、本実施形態に係る電解研磨用電解液の比較例１〜８について示す図である。 As described above, each example of the electrolytic polishing electrolytic solution that was able to be properly burned out has been described. Subsequently, suitable blending of potassium dihydrogen phosphate, dipotassium hydrogen phosphate, citric acid, and sodium citrate The amount will be further described with reference to FIG. FIG. 2 is a diagram illustrating Comparative Examples 1 to 8 of the electrolytic polishing electrolytic solution according to the present embodiment.
まず、リン酸二水素カリウムとリン酸水素二カリウムの電解液全体の質量に対する質量配合比の下限について、実施例５のリン酸二水素カリウム４質量％及びリン酸水素二カリウム４質量％が下限に近い値であった。カリウムのリン酸塩であるリン酸二水素カリウム及びリン酸水素二カリウムの配合量が少なくなると、電解液のｐＨが小さくなり、排水基準（ｐＨ５．８〜８．６）を満たさなくなってしまう。 First, about the minimum of the mass blending ratio with respect to the mass of the whole electrolyte of potassium dihydrogen phosphate and dipotassium hydrogen phosphate, 4 mass% of potassium dihydrogen phosphate and 4 mass% of dipotassium hydrogen phosphate of Example 5 are the lower limits. It was close to the value. When the blending amount of potassium dihydrogen phosphate and dipotassium hydrogen phosphate, which are potassium phosphates, decreases, the pH of the electrolytic solution decreases and the drainage standard (pH 5.8 to 8.6) is not satisfied.
図２に示す比較例１は、リン酸二水素カリウム及びリン酸水素二カリウムの質量配合比がそれぞれ２質量％であり、比較例２は、同質量配合比がそれぞれ３質量％である。比較例１のｐＨは５．４３、比較例２のｐＨは５．７８となっており、排出基準を満たしていない。このように、リン酸二水素カリウムとリン酸水素二カリウムの質量配合比は、電解液の全質量に対してそれぞれ４質量％以上であることが望ましい。 In Comparative Example 1 shown in FIG. 2, the mass blending ratio of potassium dihydrogen phosphate and dipotassium hydrogen phosphate is 2% by mass, respectively, and in Comparative Example 2, the mass blending ratio is 3% by mass. The pH of Comparative Example 1 is 5.43, and the pH of Comparative Example 2 is 5.78, which does not satisfy the discharge standard. Thus, as for the mass compounding ratio of potassium dihydrogen phosphate and dipotassium hydrogen phosphate, it is desirable that it is 4 mass% or more, respectively with respect to the total mass of electrolyte solution.
また、リン酸二水素カリウムとリン酸水素二カリウムの質量配合比の上限について、実施例２０のリン酸二水素カリウム１４質量％及びリン酸水素二カリウム１４質量％が上限に近い値であった。リン酸二水素カリウム及びリン酸水素二カリウムの配合量が多くなると、電解研磨作業中に白い結晶（原料であるリン酸カリウムの結晶）の固形物が析出し、焼け取り作業性が大きく低下し、続行が困難になってしまう場合もある。 Moreover, about the upper limit of the mass blending ratio of potassium dihydrogen phosphate and dipotassium hydrogen phosphate, 14% by mass of potassium dihydrogen phosphate and 14% by mass of dipotassium hydrogen phosphate in Example 20 were close to the upper limit. . When the amount of potassium dihydrogen phosphate and dipotassium hydrogen phosphate increases, solids of white crystals (crystals of potassium phosphate, which is the raw material) are deposited during the electropolishing operation, and the burn-out workability is greatly reduced. , It may be difficult to continue.
図２に示す比較例３は、リン酸二水素カリウム及びリン酸水素二カリウムの質量配合比がそれぞれ１５質量％であるが、比較例３の電解研磨用電解液を用いて電解研磨作業を行うと、固形物が析出して作業続行が困難になった。このように、リン酸二水素カリウムとリン酸水素二カリウムの質量配合比は、電解液の全質量に対してそれぞれ１４質量％以下であることが望ましい。 In Comparative Example 3 shown in FIG. 2, the mass blending ratio of potassium dihydrogen phosphate and dipotassium hydrogen phosphate is 15% by mass, respectively, and the electrolytic polishing operation is performed using the electrolytic polishing electrolytic solution of Comparative Example 3. As a result, solid matter precipitated and it was difficult to continue the operation. Thus, as for the mass compounding ratio of potassium dihydrogen phosphate and dipotassium hydrogen phosphate, it is desirable that it is 14 mass% or less, respectively with respect to the total mass of electrolyte solution.
以上、リン酸二水素カリウム及びリン酸水素二カリウムの質量配合比は、それぞれ４〜１４（４以上１４以下）質量％であることが望ましいが、電解研磨用電解液のｐＨをより中性に近づけると共に、電解研磨作業中の固形物の析出を確実に防ぐためには、それぞれ５〜１２質量％であることが望ましく、さらには７〜９質量％であることが望ましい。 As described above, the mass blending ratio of potassium dihydrogen phosphate and dipotassium hydrogen phosphate is preferably 4 to 14 (4 or more and 14 or less) mass%, respectively. However, the pH of the electrolytic polishing electrolytic solution is more neutral. In order to make it close and to prevent solid deposits during the electropolishing work, it is preferably 5 to 12% by mass, and more preferably 7 to 9% by mass.
次に、クエン酸とクエン酸ナトリウムの電解液全体の質量に対する質量配合比の下限について、実施例２２のクエン酸０．１質量％及びクエン酸ナトリウム０．１質量％が下限に近い値であった。比較例４はクエン酸ナトリウムの配合量を０、比較例５はクエン酸の配合量を０とした電解液であるが、比較例４，５の電解液を用いて電解研磨作業を行っても溶接焼け取りが不十分であったり、表面汚れが発生したりした。 Next, regarding the lower limit of the mass blending ratio of citric acid and sodium citrate with respect to the total mass of the electrolyte solution, 0.1% by mass of citric acid and 0.1% by mass of sodium citrate in Example 22 were close to the lower limit. It was. Comparative Example 4 is an electrolytic solution in which the blending amount of sodium citrate is 0, and Comparative Example 5 is an electrolytic solution in which the blending amount of citric acid is 0. Even if the electrolytic polishing operation is performed using the electrolytic solutions of Comparative Examples 4 and 5, Insufficient weld burn-out or surface contamination occurred.
また、クエン酸とクエン酸ナトリウムの電解液全体の質量に対する質量配合比の上限について、実施例２のクエン酸１質量％及びクエン酸ナトリウム３質量％、実施例１２のクエン酸２質量％及びクエン酸ナトリウム２質量％の電解液であれば、溶接焼けを良好に除去することができた。 Moreover, about the upper limit of the mass mixture ratio with respect to the mass of the whole electrolyte solution of a citric acid and sodium citrate, 1 mass% of citric acid of Example 2, 3 mass% of sodium citrate, 2 mass% of citric acid of Example 12, and citric acid With the electrolyte solution of 2% by weight of sodium acid, it was possible to remove the weld burn well.
一方、比較例６はクエン酸４質量％及びクエン酸ナトリウム４質量％の電解液であるが、比較例６のｐＨは５．３５と排水基準を満たしていない。但し、クエン酸の質量配合比が２質量％以下であれば、クエン酸ナトリウムの質量配合比が４質量％であっても排水基準を満たしていた。 On the other hand, Comparative Example 6 is an electrolytic solution of 4% by mass of citric acid and 4% by mass of sodium citrate, but the pH of Comparative Example 6 is 5.35, which does not satisfy the drainage standard. However, if the mass blending ratio of citric acid was 2% by mass or less, the drainage standard was satisfied even if the mass blending ratio of sodium citrate was 4% by mass.
以上より、クエン酸の質量配合比は、０．１〜２質量％であることが望ましく、クエン酸ナトリウムの質量配合比は、０．１〜４質量％であることが望ましい。また、電解研磨用電解液のｐＨをより中性に近づけると共に、溶接焼け取りをより効果的に行うためには、クエン酸の質量配合比が０．５〜２質量％、クエン酸ナトリウムの質量配合比が０．５〜２質量％であることが望ましく、さらには、クエン酸の質量配合比が０．８〜２質量％、クエン酸ナトリウムの質量配合比が０．８〜２質量％であることがより望ましい。 From the above, the mass blending ratio of citric acid is desirably 0.1 to 2% by mass, and the mass blending ratio of sodium citrate is desirably 0.1 to 4% by mass. In addition, in order to bring the pH of the electrolytic polishing electrolytic solution closer to neutrality and more effectively to remove the weld burn, the mass blending ratio of citric acid is 0.5 to 2% by mass, and the mass of sodium citrate. The blending ratio is desirably 0.5 to 2% by mass, and further, the mass blending ratio of citric acid is 0.8 to 2% by weight, and the mass blending ratio of sodium citrate is 0.8 to 2% by weight. More desirable.
次に、リン酸二水素カリウムに対するリン酸水素二カリウムとの質量配合比の下限について、リン酸二水素カリウムの配合量が相対的に大きくなると、電解液の酸性が強くなり排水基準を満たさなくなる。例えば、比較例７のリン酸二水素カリウム１４質量％及びリン酸水素二カリウム４質量％の電解液は、ｐＨが５．４４となり排水基準を満たしていない。よって、リン酸二水素カリウムに対するリン酸水素二カリウムとの質量配合比は、０．５以上であることが望ましい。 Next, regarding the lower limit of the mass blending ratio of dipotassium hydrogen phosphate to potassium dihydrogen phosphate, when the blending amount of potassium dihydrogen phosphate is relatively large, the acidity of the electrolyte becomes stronger and the drainage standard is not satisfied. . For example, the electrolyte of 14% by mass potassium dihydrogen phosphate and 4% by mass dipotassium hydrogen phosphate in Comparative Example 7 has a pH of 5.44 and does not satisfy the wastewater standard. Therefore, the mass blending ratio of dipotassium hydrogen phosphate to potassium dihydrogen phosphate is preferably 0.5 or more.
また、リン酸二水素カリウムに対するリン酸水素二カリウムとの質量配合比の上限について、実施例２１のリン酸二水素カリウム４質量％及びリン酸水素二カリウム１４質量％が上限に近い値であった。リン酸水素二カリウムの配合量が相対的に大きくなると、溶接焼け取りが不十分であったり、表面汚れが発生したりした。例えば、比較例８のリン酸二水素カリウム２質量％及びリン酸水素二カリウム１６質量％の電解液は、溶接焼け取りが不十分であった。 Further, regarding the upper limit of the mass blending ratio of dipotassium hydrogen phosphate to potassium dihydrogen phosphate, 4% by mass of potassium dihydrogen phosphate and 14% by mass of dipotassium hydrogen phosphate in Example 21 were close to the upper limit. It was. When the blending amount of dipotassium hydrogen phosphate was relatively large, welding burn-out was insufficient or surface contamination occurred. For example, the electrolyte solution containing 2% by mass of potassium dihydrogen phosphate and 16% by mass of dipotassium hydrogen phosphate in Comparative Example 8 was insufficient in welding burn-out.
以上より、リン酸二水素カリウムに対するリン酸水素二カリウムとの質量配合比は、０．５〜４であることが望ましい。また、電解研磨用電解液のｐＨをより中性に近づけると共に、溶接焼け取りをより効果的に行うためには、同質量配合比が０．５〜２．４であることが望ましく、さらには０．７〜１．３であることが望ましい。 From the above, the mass blending ratio of dipotassium hydrogen phosphate to potassium dihydrogen phosphate is preferably 0.5-4. Further, in order to bring the pH of the electrolytic polishing electrolytic solution closer to neutrality and more effectively to remove the weld burn, the same mass blending ratio is preferably 0.5 to 2.4, It is desirable that it is 0.7-1.3.
次に、クエン酸に対するクエン酸ナトリウムの質量配合比の下限について、実施例１６のクエン酸１．５質量％及びクエン酸ナトリウム０．５質量％が下限に近い値であった。クエン酸の配合量が相対的に大きくなると、各原料の配合量にもよるが、排水基準を満たさなくなったり、溶接焼け取りが不十分であったり、表面汚れが発生したりした。 Next, with respect to the lower limit of the mass blending ratio of sodium citrate to citric acid, 1.5% by mass of citric acid and 0.5% by mass of sodium citrate in Example 16 were values close to the lower limit. When the amount of citric acid was relatively large, depending on the amount of each raw material, the drainage standard was not satisfied, welding burn-out was insufficient, and surface contamination occurred.
また、クエン酸に対するクエン酸ナトリウムの質量配合比の上限について、実施例２のクエン酸１質量％及びクエン酸ナトリウム３質量％が上限に近い値であった。クエン酸ナトリウムの配合量が相対的に大きくなると、各原料の配合量にもよるが、排水基準を満たさなくなったり、溶接焼け取りが不十分であったり、表面汚れが発生したりした。 Moreover, about the upper limit of the mass blending ratio of sodium citrate to citric acid, 1% by mass of citric acid and 3% by mass of sodium citrate in Example 2 were values close to the upper limit. When the blending amount of sodium citrate was relatively large, depending on the blending amount of each raw material, the drainage standard was not satisfied, welding burn-out was insufficient, and surface contamination occurred.
以上より、クエン酸に対するクエン酸ナトリウムの質量配合比は、０．３〜３．５であることが望ましく、さらには０．５〜３であることが望ましい。 From the above, the mass blending ratio of sodium citrate to citric acid is preferably 0.3 to 3.5, and more preferably 0.5 to 3.
以上、詳細に説明した本実施形態に係る電解研磨用電解液によれば、ステンレス鋼に形成された溶接焼けを短時間で綺麗に除去することができる。また、本実施形態に係る電解研磨用電解液のｐＨは排水基準を満たしており、電解研磨作業時の作業者の安全性を確保することができると共に、中和することなく廃棄することができ、作業効率を格段に向上させることができる。 As described above, according to the electrolytic polishing electrolytic solution according to the present embodiment described in detail, the weld burn formed on the stainless steel can be removed cleanly in a short time. In addition, the pH of the electrolytic solution for electropolishing according to the present embodiment satisfies the drainage standard, and can ensure the safety of the worker during the electropolishing work and can be discarded without being neutralized. The working efficiency can be greatly improved.
以上、本実施形態について説明したが、本発明の実施形態は上記実施の形態に限定されるものではなく、本発明の主旨を逸脱しない範囲内で種々の変形が可能である。例えば、上記実施形態では、ステンレス鋼の溶接焼け取りに使用する場合を例に挙げて説明したが、上記実施形態に係る電解研磨用電解液は、ステンレス鋼に限らず、広く含クロム合金鋼の電解研磨に使用することができる。 Although the present embodiment has been described above, the embodiment of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in the above-described embodiment, the case where it is used for welding and scoring of stainless steel has been described as an example. However, the electrolytic polishing electrolytic solution according to the above-described embodiment is not limited to stainless steel, and is widely used in chromium-containing alloy steel. It can be used for electropolishing.
また、上記実施形態では、直流法の電解研磨に使用する場合を例に挙げて説明したが、交流法の電解研磨にも使用できるのは言うまでもない。 In the above-described embodiment, the case of using the direct current method for electropolishing is described as an example, but it goes without saying that the method can also be used for the alternating current method of electropolishing.
また、上記実施形態に係る電解研磨用電解液として、リン酸二水素カリウム、リン酸水素二カリウム、クエン酸、クエン酸ナトリウムのみを配合した水溶液について説明したが、本発明の主旨を逸脱しない範囲内で、他の添加剤を加えた水溶液としても良い。 Moreover, although the aqueous solution which mix | blended only potassium dihydrogen phosphate, dipotassium hydrogen phosphate, a citric acid, and sodium citrate was demonstrated as an electrolytic solution for electropolishing which concerns on the said embodiment, the range which does not deviate from the main point of this invention Of these, an aqueous solution containing other additives may be used.
Claims (5)
リン酸二水素カリウムと、
リン酸水素二カリウムと、
クエン酸と、
クエン酸ナトリウムと、
を含む水溶液であることを特徴とする電解研磨用電解液。 In the electrolytic solution for electrolytic polishing used for electrolytic polishing of chromium-containing alloy steel,
Potassium dihydrogen phosphate,
Dipotassium hydrogen phosphate,
Citric acid,
Sodium citrate,
An electrolytic solution for electrolytic polishing, which is an aqueous solution containing
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| JP2019119907A (en) * | 2017-12-28 | 2019-07-22 | 株式会社日本科学エンジニアリング | Electrolytic polishing liquid for stainless steel welding scale removal |
| CN113699579A (en) * | 2021-09-03 | 2021-11-26 | 深圳市汉伟港泰首饰机械设备有限公司 | Metal polishing method |
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