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A method for phosphating nuclear power equipment bolts and phosphating solution
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A phosphating solution and bolt technology, which is applied in the coating process of metal materials, etc., can solve the problems of heavy film and difficult phosphating
Active Publication Date: 2020-04-17
中广核工程有限公司 +1
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[0005] Aiming at the problem that bolts in the prior art use high-temperature manganese-based phosphating, the film is heavy, and phosphating is relatively difficult, the invention provides a method for phosphating bolts of nuclear power equipment and a phosphating solution, which can obtain reliable, uniform and dense Phosphating layer of nuclear power equipment bolts with good corrosion resistance
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Embodiment 1
[0045] Such as figure 1 As shown, the method for phosphating nuclear power equipment bolts in Embodiment 1 of the present invention comprises the following steps:
[0046] S1. Pretreatment of equipment bolts: first, soak the bolts in degreasing liquid for degreasing treatment, wash with water at room temperature after degreasing, pickle with hydrochloric acid after washing, wash with water again after pickling, and then perform surface adjustment ;
[0047] S2. Soak the pretreated bolts in the phosphating solution for a first preset time to perform pre-phosphating;
[0048] S3. Reprocessing the pre-phosphating bolts: washing the bolts again, pickling with hydrochloric acid after washing, washing with water again after pickling, and then adjusting the surface;
[0049] S4, immersing the reprocessed bolt in the phosphating solution for a second preset time to perform phosphating.
Embodiment 2
[0051] Such as figure 2 As shown, the method for the phosphating of nuclear power equipment bolts in Embodiment 2 of the present invention also includes the steps:
[0052] S5. Carry out post-treatment to the bolts after phosphating: wash the bolts with water again, passivate them with a passivating agent after water washing, wash them with water again after passivation, and then dry and immerse them in oil;
[0053] S6. Check the quality of the phosphating layer on the phosphating bolts.
[0054] Specifically, in the step S2 and step S4, the phosphating solution used in the pre-phosphating and phosphating is the same, and the phosphating solution includes: a concentration of 35g / L of Mazoff salt, a concentration of 20g / L of nitric acid Manganese, and an accelerator at a concentration of 3-5g / L;
[0055] Wherein the accelerator is selected from one or more of nitrite, nitrate or chlorate.
[0056] Specifically, the total acidity of the phosphating solution is 30-40 points,...
Embodiment 3
[0066] Embodiment 3 of the present invention provides a kind of phosphating solution, which is used for pre-phosphating and phosphating the bolts of nuclear power equipment. An accelerator with a concentration of 3-5g / L; wherein the accelerator is selected from one or more of nitrite, nitrate or chlorate.
[0067] In this embodiment, the total acidity of the phosphating solution is 30-40 points, and the acidity of the free acid of the phosphating solution is 3-4 points.
[0068] To sum up, compared with the prior art, the solution of the present application has at least the following beneficial technical effects: it is possible to obtain a nuclear power equipment bolt phosphating layer with reliable quality, uniform density, and good corrosion resistance.
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Abstract
The invention discloses a nuclear power equipment bolt phosphating method which comprises the following step: S1, pretreating equipment bolts: firstly soaking the bolts in an oil removing solution toperform oil removing treatment, washing under the normal temperature after oil removing, utilizing hydrochloric acid to perform acid pickling after washing, washing again after acid pickling and thenperforming surface conditioning; S2, soaking the pretreated bolts in a phosphating solution for a first preset duration to perform pre-phosphating; S3, retreating the pre-phosphated bolts: washing thebolts again, utilizing hydrochloric acid to perform acid pickling after washing, washing again after acid pickling and then performing surface conditioning; S4, soaking the retreated bolts in the phosphating solution again for a second preset duration to perform phosphating. The invention further provides the phosphating solution. By means of the nuclear power equipment bolt phosphating method and the phosphating solution disclosed by the invention, a nuclear power equipment bolt phosphating layer which has the advantages of reliable quality, evenness, compactness and good corrosion resistance is obtained.
Description
technical field [0001] The invention relates to a phosphating treatment process, in particular to a method for phosphating nuclear power equipment bolts and a phosphating solution Background technique [0002] In nuclear power plants, bolt assemblies are the most important fasteners for nuclear island main equipment such as reactor pressure vessels and steam generators. According to relevant manufacturing standards, a layer of phosphating film needs to be formed on the surface of the bolt, which is conducive to improving the friction coefficient of the bolt and avoiding the seizure of the bolt and nut, and has a certain anti-rust effect. Phosphating is the production of a layer of non-metallic deposits on the metal surface. It is a process of chemical and physical changes. Any factor out of control in the process may cause serious quality problems in the phosphating layer. [0003] Nuclear power products have high requirements on the phosphating layer. The phosphating quali...
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