CN112376057A - Oxidation and corrosion resistant surface treatment process for cast iron - Google Patents

Oxidation and corrosion resistant surface treatment process for cast iron Download PDF

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Publication number
CN112376057A
CN112376057A CN202011165851.3A CN202011165851A CN112376057A CN 112376057 A CN112376057 A CN 112376057A CN 202011165851 A CN202011165851 A CN 202011165851A CN 112376057 A CN112376057 A CN 112376057A
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parts
cast iron
acid
oxidation
prepared
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CN202011165851.3A
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Chinese (zh)
Inventor
汤自芳
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Maanshan Xinjia Machinery Manufacturing Co ltd
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Maanshan Xinjia Machinery Manufacturing Co ltd
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Priority to CN202011165851.3A priority Critical patent/CN112376057A/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • C23G1/088—Iron or steel solutions containing organic acids
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
    • C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
    • C23G1/066—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors phosphorus-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • C23G1/086—Iron or steel solutions containing HF

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The invention relates to the technical field of metal processing technology, in particular to an oxidation-resistant corrosion-resistant surface treatment technology for cast iron, which comprises the following steps: (1) degreasing; (2) acid washing; (3) drying, annealing, normalizing and tempering to obtain the product. According to the invention, before the cast iron heat treatment, degreasing treatment is carried out by using the degreasing agent, various grease, dust silt, metal powder, hand sweat on the surface of a workpiece and oily dirt adhered to the workpiece in the machining process can be efficiently removed and thoroughly separated, then pickling is carried out, an oxide film on the surface of the cast iron is thoroughly washed away, and finally heat treatment is carried out, so that the maximization of the heat treatment effect can be ensured, and the cast iron with excellent oxidation resistance and corrosion resistance is obtained. Experiments prove that the oxidation resistance and the corrosion resistance of the cast iron surface treated by the method are improved by more than 20 percent compared with similar products sold in the market, and the effect is obvious.

Description

Oxidation and corrosion resistant surface treatment process for cast iron
Technical Field
The invention relates to the technical field of metal processing technology, in particular to an oxidation-resistant corrosion-resistant surface treatment technology for cast iron.
Background
Metals are materials that are shiny, have good electrical conductivity, thermal conductivity and mechanical properties, and have a positive temperature coefficient of resistance. There are 86 kinds of metals in the world, and people generally classify the metals into ferrous metals and non-ferrous metals according to the characteristics of the metals such as color and property. The carbon in the cast pig iron is present in the form of flake graphite, whose fracture is grey, also commonly called grey iron. The graphite is soft and has lubricating effect, so that the cast pig iron has good cutting, wear-resisting and casting properties. However, it has insufficient tensile strength, so that it cannot be forged and rolled, and can only be used for making various castings, such as various machine tool seats, iron pipes, etc.
Chinese patent (publication No. CN103849736A, publication No. 2014.06.11) discloses a heat treatment process of high-chromium cast iron, which comprises the following steps: A. annealing treatment; B. quenching treatment; and (5) tempering treatment is carried out. But the method adopts a heat treatment method to improve the strength, the hardness and the wear resistance of the cast iron, and has single method and further room for improvement.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides an oxidation-resistant and corrosion-resistant surface treatment process for cast iron.
In order to achieve the purpose, the invention provides the following technical scheme:
an oxidation-resistant corrosion-resistant surface treatment process for cast iron specifically comprises the following steps:
(1) degreasing: degreasing cast iron by using a degreasing agent, wherein the degreasing agent is prepared from the following components in parts by weight: 2-4 parts of emulsifier, 1-3 parts of sodium carbonate, 5-8 parts of sodium tripolyphosphate, 5-9 parts of organic acid, 2-6 parts of thiourea, 1-5 parts of octadecylamine, 8-10 parts of borax, 3-6 parts of disodium ethylene diamine tetraacetate, 3-6 parts of benzotriazole, 2-7 parts of dodecyl sulfate, 2-9 parts of anhydrous sodium sulphate and 250 parts of water 200-;
(2) acid washing: the degreased cast iron is pickled by using a pickling agent, wherein the pickling agent is prepared from the following components in parts by weight: 30-40 parts of hydrochloric acid, 10-20 parts of hydrofluoric acid, 1-3 parts of corrosion inhibitor and 1-3 parts of dispersant, wherein the concentration of the hydrochloric acid is 40-60%, and the concentration of the hydrofluoric acid is 40-60%;
(3) drying, annealing, normalizing and tempering to obtain the product.
As a further scheme of the invention: the emulsifier in the step (1) is prepared from polyol fatty acid ester and sodium alkyl benzene sulfonate according to the mass ratio of 2-6: 1 are mixed to prepare the product.
As a further scheme of the invention: the organic acid in the step (1) is prepared by mixing sulfamic acid and citric acid according to the mass ratio of 1: 5-8.
As a further scheme of the invention: the corrosion inhibitor in the step (2) is prepared by mixing thiobenzothiazole and phosphine carboxylic acid according to the mass ratio of 2-5: 1.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, before the cast iron heat treatment, degreasing treatment is carried out by using the degreasing agent, various grease, dust silt, metal powder, hand sweat on the surface of a workpiece and oily dirt adhered to the workpiece in the machining process can be efficiently removed and thoroughly separated, then pickling is carried out, an oxide film on the surface of the cast iron is thoroughly washed away, and finally heat treatment is carried out, so that the maximization of the heat treatment effect can be ensured, and the cast iron with excellent oxidation resistance and corrosion resistance is obtained. Experiments prove that the oxidation resistance and the corrosion resistance of the cast iron surface treated by the method are improved by more than 20 percent compared with similar products sold in the market, and the effect is obvious.
Detailed Description
Example 1
An oxidation-resistant corrosion-resistant surface treatment process for cast iron specifically comprises the following steps:
(1) degreasing: degreasing cast iron by using a degreasing agent, wherein the degreasing agent is prepared from the following components in parts by weight: 2 parts of emulsifier, 1 part of sodium carbonate, 5 parts of sodium tripolyphosphate, 5 parts of organic acid, 2 parts of thiourea, 1 part of octadecylamine, 8 parts of borax, 3 parts of disodium ethylene diamine tetraacetate, 3 parts of benzotriazole, 2 parts of dodecyl sulfate, 2 parts of anhydrous sodium sulphate and 200 parts of water;
(2) acid washing: the degreased cast iron is pickled by using a pickling agent, wherein the pickling agent is prepared from the following components in parts by weight: 30 parts of hydrochloric acid, 10 parts of hydrofluoric acid, 1 part of corrosion inhibitor and 1 part of dispersant, wherein the concentration of the hydrochloric acid is 40 percent, and the concentration of the hydrofluoric acid is 40 percent;
(3) drying, annealing, normalizing and tempering to obtain the product.
As a further scheme of the invention: the emulsifier in the step (1) is prepared from polyol fatty acid ester and sodium alkyl benzene sulfonate according to a mass ratio of 2:1 are mixed to prepare the product.
As a further scheme of the invention: the organic acid in the step (1) is prepared by mixing sulfamic acid and citric acid according to the mass ratio of 1: 5.
As a further scheme of the invention: the corrosion inhibitor in the step (2) is prepared by mixing thiobenzothiazole and phosphine carboxylic acid according to the mass ratio of 2: 1.
Example 2
An oxidation-resistant corrosion-resistant surface treatment process for cast iron specifically comprises the following steps:
(1) degreasing: degreasing cast iron by using a degreasing agent, wherein the degreasing agent is prepared from the following components in parts by weight: 4 parts of emulsifier, 3 parts of sodium carbonate, 8 parts of sodium tripolyphosphate, 9 parts of organic acid, 6 parts of thiourea, 5 parts of octadecylamine, 10 parts of borax, 6 parts of disodium ethylene diamine tetraacetate, 6 parts of benzotriazole, 7 parts of dodecyl sulfate, 9 parts of anhydrous sodium sulphate and 250 parts of water;
(2) acid washing: the degreased cast iron is pickled by using a pickling agent, wherein the pickling agent is prepared from the following components in parts by weight: 40 parts of hydrochloric acid, 20 parts of hydrofluoric acid, 3 parts of corrosion inhibitor and 3 parts of dispersant, wherein the concentration of the hydrochloric acid is 60 percent, and the concentration of the hydrofluoric acid is 60 percent;
(3) drying, annealing, normalizing and tempering to obtain the product.
As a further scheme of the invention: the emulsifier in the step (1) is prepared from polyol fatty acid ester and sodium alkyl benzene sulfonate according to a mass ratio of 6: 1 are mixed to prepare the product.
As a further scheme of the invention: the organic acid in the step (1) is prepared by mixing sulfamic acid and citric acid according to the mass ratio of 1: 8.
As a further scheme of the invention: the corrosion inhibitor in the step (2) is prepared by mixing thiobenzothiazole and phosphine carboxylic acid according to the mass ratio of 5: 1.
Example 3
An oxidation-resistant corrosion-resistant surface treatment process for cast iron specifically comprises the following steps:
(1) degreasing: degreasing cast iron by using a degreasing agent, wherein the degreasing agent is prepared from the following components in parts by weight: 2 parts of emulsifier, 3 parts of sodium carbonate, 5 parts of sodium tripolyphosphate, 9 parts of organic acid, 2 parts of thiourea, 5 parts of octadecylamine, 8 parts of borax, 6 parts of disodium ethylene diamine tetraacetate, 3 parts of benzotriazole, 7 parts of dodecyl sulfate, 2 parts of anhydrous sodium sulphate and 250 parts of water;
(2) acid washing: the degreased cast iron is pickled by using a pickling agent, wherein the pickling agent is prepared from the following components in parts by weight: 30 parts of hydrochloric acid, 20 parts of hydrofluoric acid, 1 part of corrosion inhibitor and 3 parts of dispersant, wherein the concentration of the hydrochloric acid is 40%, and the concentration of the hydrofluoric acid is 60%;
(3) drying, annealing, normalizing and tempering to obtain the product.
As a further scheme of the invention: the emulsifier in the step (1) is prepared from polyol fatty acid ester and sodium alkyl benzene sulfonate according to a mass ratio of 2:1 are mixed to prepare the product.
As a further scheme of the invention: the organic acid in the step (1) is prepared by mixing sulfamic acid and citric acid according to the mass ratio of 1: 8.
As a further scheme of the invention: the corrosion inhibitor in the step (2) is prepared by mixing thiobenzothiazole and phosphine carboxylic acid according to the mass ratio of 2: 1.
Example 4
An oxidation-resistant corrosion-resistant surface treatment process for cast iron specifically comprises the following steps:
(1) degreasing: degreasing cast iron by using a degreasing agent, wherein the degreasing agent is prepared from the following components in parts by weight: 4 parts of emulsifier, 1 part of sodium carbonate, 8 parts of sodium tripolyphosphate, 5 parts of organic acid, 6 parts of thiourea, 1 part of octadecylamine, 10 parts of borax, 3 parts of disodium ethylene diamine tetraacetate, 6 parts of benzotriazole, 2 parts of dodecyl sulfate, 9 parts of anhydrous sodium sulphate and 200 parts of water;
(2) acid washing: the degreased cast iron is pickled by using a pickling agent, wherein the pickling agent is prepared from the following components in parts by weight: 40 parts of hydrochloric acid, 10 parts of hydrofluoric acid, 3 parts of corrosion inhibitor and 1 part of dispersant, wherein the concentration of the hydrochloric acid is 60 percent, and the concentration of the hydrofluoric acid is 40 percent;
(3) drying, annealing, normalizing and tempering to obtain the product.
As a further scheme of the invention: the emulsifier in the step (1) is prepared from polyol fatty acid ester and sodium alkyl benzene sulfonate according to a mass ratio of 6: 1 are mixed to prepare the product.
As a further scheme of the invention: the organic acid in the step (1) is prepared by mixing sulfamic acid and citric acid according to the mass ratio of 1: 5.
As a further scheme of the invention: the corrosion inhibitor in the step (2) is prepared by mixing thiobenzothiazole and phosphine carboxylic acid according to the mass ratio of 5: 1.
Example 5
An oxidation-resistant corrosion-resistant surface treatment process for cast iron specifically comprises the following steps:
(1) degreasing: degreasing cast iron by using a degreasing agent, wherein the degreasing agent is prepared from the following components in parts by weight: 3 parts of emulsifier, 2 parts of sodium carbonate, 7 parts of sodium tripolyphosphate, 6 parts of organic acid, 4 parts of thiourea, 3 parts of octadecylamine, 9 parts of borax, 4 parts of disodium ethylene diamine tetraacetate, 4 parts of benzotriazole, 5 parts of dodecyl sulfate, 4 parts of anhydrous sodium sulphate and 220 parts of water;
(2) acid washing: the degreased cast iron is pickled by using a pickling agent, wherein the pickling agent is prepared from the following components in parts by weight: 35 parts of hydrochloric acid, 15 parts of hydrofluoric acid, 2 parts of corrosion inhibitor and 2 parts of dispersant, wherein the concentration of the hydrochloric acid is 50%, and the concentration of the hydrofluoric acid is 50%;
(3) drying, annealing, normalizing and tempering to obtain the product.
As a further scheme of the invention: the emulsifier in the step (1) is prepared from polyol fatty acid ester and sodium alkyl benzene sulfonate according to a mass ratio of 4: 1 are mixed to prepare the product.
As a further scheme of the invention: the organic acid in the step (1) is prepared by mixing sulfamic acid and citric acid according to the mass ratio of 1: 6.
As a further scheme of the invention: the corrosion inhibitor in the step (2) is prepared by mixing thiobenzothiazole and phosphine carboxylic acid according to the mass ratio of 3: 1.
Comparative example
This comparative example is different from example 1 in that the degreasing agent and the pickling agent in step (1) and step (2) are not used, and the degreasing and pickling operations are performed using only the existing degreasing agent and pickling agent, and the other steps are the same as those in example 1.
Blank control group
The same products are sold in the market.
Experiments prove that the oxidation resistance and the corrosion resistance of the cast iron surface treated by the method are improved by more than 20 percent compared with similar products sold in the market, and the effect is obvious.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (8)

1. The surface treatment process for the cast iron is characterized by comprising the following steps:
(1) degreasing: degreasing cast iron by using a degreasing agent, wherein the degreasing agent is prepared from the following components in parts by weight: 2-4 parts of emulsifier, 1-3 parts of sodium carbonate, 5-8 parts of sodium tripolyphosphate, 5-9 parts of organic acid, 2-6 parts of thiourea, 1-5 parts of octadecylamine, 8-10 parts of borax, 3-6 parts of disodium ethylene diamine tetraacetate, 3-6 parts of benzotriazole, 2-7 parts of dodecyl sulfate, 2-9 parts of anhydrous sodium sulphate and 250 parts of water 200-;
(2) acid washing: the degreased cast iron is pickled by using a pickling agent, wherein the pickling agent is prepared from the following components in parts by weight: 30-40 parts of hydrochloric acid, 10-20 parts of hydrofluoric acid, 1-3 parts of corrosion inhibitor and 1-3 parts of dispersant, wherein the concentration of the hydrochloric acid is 40-60%, and the concentration of the hydrofluoric acid is 40-60%;
(3) drying, annealing, normalizing and tempering to obtain the product.
2. The surface treatment process for the cast iron, which is resistant to oxidation and corrosion, according to claim 1, wherein the degreasing agent in the step (1) is prepared from the following components in parts by weight: 3 parts of emulsifier, 2 parts of sodium carbonate, 7 parts of sodium tripolyphosphate, 6 parts of organic acid, 4 parts of thiourea, 3 parts of octadecylamine, 9 parts of borax, 4 parts of disodium ethylene diamine tetraacetate, 4 parts of benzotriazole, 5 parts of dodecyl sulfate, 4 parts of anhydrous sodium sulphate and 220 parts of water.
3. The oxidation and corrosion resistant surface treatment process for cast iron according to claim 1, characterized in that: the pickling agent in the step (2) is prepared from the following components in parts by weight: 35 parts of hydrochloric acid, 15 parts of hydrofluoric acid, 2 parts of corrosion inhibitor and 2 parts of dispersant.
4. The oxidation and corrosion resistant surface treatment process for cast iron according to claim 1 or 3, characterized in that: the concentration of the hydrochloric acid is 50%.
5. The oxidation and corrosion resistant surface treatment process for cast iron according to claim 1 or 3, characterized in that: the concentration of the hydrofluoric acid is 50%.
6. The oxidation and corrosion resistant surface treatment process for cast iron according to claim 1, characterized in that: the emulsifier in the step (1) is prepared from polyol fatty acid ester and sodium alkyl benzene sulfonate according to the mass ratio of 2-6: 1 are mixed to prepare the product.
7. The oxidation and corrosion resistant surface treatment process for cast iron according to claim 1, characterized in that: the organic acid in the step (1) is prepared by mixing sulfamic acid and citric acid according to the mass ratio of 1: 5-8.
8. The oxidation and corrosion resistant surface treatment process for cast iron according to claim 1, characterized in that: the corrosion inhibitor in the step (2) is prepared by mixing thiobenzothiazole and phosphine carboxylic acid according to the mass ratio of 2-5: 1.
CN202011165851.3A 2020-10-27 2020-10-27 Oxidation and corrosion resistant surface treatment process for cast iron Withdrawn CN112376057A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011165851.3A CN112376057A (en) 2020-10-27 2020-10-27 Oxidation and corrosion resistant surface treatment process for cast iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011165851.3A CN112376057A (en) 2020-10-27 2020-10-27 Oxidation and corrosion resistant surface treatment process for cast iron

Publications (1)

Publication Number Publication Date
CN112376057A true CN112376057A (en) 2021-02-19

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Country Status (1)

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Application publication date: 20210219