Room temperature blackening agent suitable for iron casting and method for preparing room temperature blackening agent suitable for iron casting

A blackening agent and iron casting technology, applied in the direction of metal material coating process, etc., can solve the problems of high cost, complicated process, inability to achieve blackening and rust prevention at the same time, and achieve the effect of high fastness and strong corrosion resistance.

Inactive Publication Date: 2013-04-17
ANHUI WEILAI SURFACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, many researchers have done a lot of research on the blackening process, but the blackening treatment of iron castings is rare. Although some researchers have made some progress, most of the treatment solutions contain phosphorus, selenium, and nitrite. Such polluting substances or processes are complex and costly, and after blackening the cast iron, in order to prevent the surface from rusting, it is necessary to immerse it in another solvent for antirust treatment, but it cannot achieve blackening and antirust at the same time. Rust features that increase operational complexity

Method used

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  • Room temperature blackening agent suitable for iron casting and method for preparing room temperature blackening agent suitable for iron casting

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preparation example Construction

[0025] A kind of preparation method that is applicable to the normal temperature blackening agent of iron casting as mentioned above, comprises the following steps:

[0026] a. According to the raw material ratio of the room temperature blackening agent suitable for iron castings as mentioned above, first add sodium molybdate and copper sulfate into part of the water and stir to dissolve completely, then add nickel sulfate, complexing agent, and film-forming agent in sequence Auxiliaries and additives are stirred to make them fully dissolved to prepare component A of the blackening agent for later use;

[0027] b. Fully dissolve polyethylene glycol and oleate in part of the water to prepare component B of the blackening agent for later use;

[0028] c. Mix and stir the blackening agent A and blackening agent B components evenly, then add the remaining water, and then use the pH regulator to adjust the pH value to 2.0-3.0, that is, the normal temperature blackening suitable for...

Embodiment 1

[0036] 1. Preparation of blackening agent

[0037] (a) First take 500ml of deionized water, add 1g of sodium molybdate and 2g of copper sulfate, and stir to completely dissolve it;

[0038] (b) Add 1g of nickel sulfate, 2g of potassium sodium tartrate, 4g of ammonium thiosulfate, and 0.5g of sodium fluorosilicate to the semi-finished product obtained in step (a) successively, and each addition of a medicament needs to be stirred to fully dissolve it, and finally Obtain blackening agent A component;

[0039] (c) Take 200ml of deionized water, add 0.5g of polyethylene glycol and 0.8g of sodium octadecenoate, stir and dissolve fully, and prepare component B of the blackening agent for later use;

[0040](d) mix and stir the prepared semi-finished products in steps (b) and (c) and then add deionized water to 1L, then adjust the pH value to 2.0 with citric acid with a mass fraction of 25%, and obtain the present invention. blackening agent.

[0041] 2. Blackening process

[004...

Embodiment 2

[0049] 1. Preparation of blackening agent

[0050] (a) First take 600ml of deionized water, add 2g of sodium molybdate and 4g of copper sulfate, and stir to completely dissolve it;

[0051] (b) Add 2g of nickel sulfate, 3g of potassium sodium tartrate, 6g of ammonium thiosulfate, and 1.0g of sodium fluorosilicate to the semi-finished product obtained in step (a) successively. Every time a medicament is added, it needs to be stirred to make it fully dissolve, and finally Obtain blackening agent A component;

[0052] (c) Take 300ml of deionized water, add 0.5g of polyethylene glycol and 0.8g of sodium octadecenoate, stir and dissolve fully, and prepare component B of the blackening agent for later use;

[0053] (d) mix and stir the prepared semi-finished products in steps (b), (c) and add deionized water to 1L, then adjust the pH value to 2.5 with citric acid with a mass fraction of 25%, and obtain the present invention. blackening agent.

[0054] 2. Blackening process

[00...

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Abstract

The invention provides a room temperature blackening agent suitable for an iron casting and a method for preparing the room temperature blackening agent suitable for the iron casting. Each liter of the blackening agent is prepared from the following raw materials: 1-3 grams of sodium molybdate, 2-6 grams of copper sulfate, 1-3 grams of nickel sulfate, 1-3 grams of complexing agent, 4-8 grams of coalescing agent, 0.3-1.5 grams of additive, 0.5-3 grams of polyethylene glycol, 0.5-3 grams of oleate and the balance of water, wherein the pH is between 2.0 and 3.0. The room temperature blackening agent suitable for the iron casting provided by the invention is the room temperature blackening agent which is environment-friendly, is toxicity-free, has strong adaptability and an excellent rust-proof function and does not contain harmful substances such as strong acid, strong alkali, phosphorus, selenium, nitrite and the like; and the room temperature blackening agent can form a layer of black film which is black, bright and uniform and has high firmness and strong corrosion resistance on workpiece surfaces.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a normal temperature blackening agent suitable for iron castings and a preparation method thereof. Background technique [0002] Blackening treatment (also known as oxidation treatment) of steel is a surface treatment technology. The oxidation treatment of iron and steel can make the surface of iron and steel workpieces form a layer of protective compounds (such as oxides), and the parts after oxidation treatment are then subjected to oil immersion and other filling treatments, which can further improve the corrosion resistance of the film layer. [0003] At present, the commonly used blackening methods of iron and steel materials are: alkaline chemical oxidation method, also known as alkaline bluish (blackening); acidic chemical oxidation method, also known as normal temperature blackening. Among them, the most commonly used alkaline blackening is to use NaOH-NaNO 2 The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/40
Inventor 童学宝
Owner ANHUI WEILAI SURFACE TECH
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