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.
CN103046038AInactive Publication Date: 2013-04-17ANHUI WEILAI SURFACE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ANHUI WEILAI SURFACE TECH
Publication Date
2013-04-17
Estimated Expiration
Not applicable · inactive patent

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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.
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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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