Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for improving corrosion resistance of carbon steel for ship

A corrosion-resistant, carbon steel technology, applied in the direction of metal material coating process, can solve problems such as adverse effects on other properties of steel, achieve long-term surface protection, high hardness, and improve performance.

Pending Publication Date: 2021-02-05
安徽华飞机械铸锻有限公司
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method greatly increases the difficulty and cost of smelting, and other properties of steel are adversely affected

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for improving the corrosion resistance of marine carbon steel, comprising immersing pretreated carbon steel parts in a treatment solution to form a corrosion-resistant chemical conversion film on the surface of the carbon steel parts;

[0018] The treatment solution is made of the following components in parts by weight: 1.8 parts of manganese phosphate, 35 parts of phosphoric acid solution, 10 parts of acetic acid solution, 0.1 part of sodium bromide, 2.0 parts of sodium phosphate, and 0.8 parts of composite carbide;

[0019] The pH value of the phosphoric acid solution is between 3.2-3.4, and the concentration of the acetic acid solution is 1.4 g / L.

[0020] Specifically, the preparation of the composite carbide includes the following process steps:

[0021] (1) Take 11.3 grams of silicon carbide micropowder, add 3.2 times the volume of ethanol solution with a mass concentration of 85%, mechanically stir at 35°C for 20 minutes, transfer to a four-necked flask...

Embodiment 2

[0027] A method for improving the corrosion resistance of marine carbon steel, comprising immersing pretreated carbon steel parts in a treatment solution to form a corrosion-resistant chemical conversion film on the surface of the carbon steel parts;

[0028] The treatment solution is made of the following components in parts by weight: 2.0 parts of manganese phosphate, 40 parts of phosphoric acid solution, 11 parts of acetic acid solution, 0.2 parts of sodium bromide, 2.7 parts of sodium phosphate, and 1.1 parts of composite carbide;

[0029] The pH value of the phosphoric acid solution is between 3.2-3.4, and the concentration of the acetic acid solution is 1.6 g / L.

[0030] Specifically, the preparation of the composite carbide includes the following process steps:

[0031] (1) Take 11.4 grams of silicon carbide micropowder, add 3.25 times the volume of an ethanol solution with a mass concentration of 88%, mechanically stir at 38°C for 25 minutes, transfer to a four-necked ...

Embodiment 3

[0037] A method for improving the corrosion resistance of marine carbon steel, comprising immersing pretreated carbon steel parts in a treatment solution to form a corrosion-resistant chemical conversion film on the surface of the carbon steel parts;

[0038] The treatment solution is made of the following components in parts by weight: 2.2 parts of manganese phosphate, 45 parts of phosphoric acid solution, 12 parts of acetic acid solution, 0.3 parts of sodium bromide, 3.5 parts of sodium phosphate, and 1.4 parts of composite carbide;

[0039] The pH value of the phosphoric acid solution is between 3.2-3.4, and the concentration of the acetic acid solution is 1.8 g / L.

[0040] Specifically, the preparation of the composite carbide includes the following process steps:

[0041] (1) Take 11.5 grams of silicon carbide micropowder, add 3.3 times the volume of ethanol solution with a mass concentration of 90%, mechanically stir at 40°C for 30 minutes, transfer to a four-necked flas...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of steel performance researches and discloses a method for improving corrosion resistance of carbon steel for a ship. Performance of a treatment liquid conversion film is improved by researching a corrosion behavior characteristic of the carbon steel in a humid environment and adding prepared composite carbide particles. The particles permeate onto thesurface of the treated carbon steel, so that the compactness is improved greatly. The thickness of the formed protective film reaches 15-25 microns to play a very strong barrier role to prevent erosion of a corrosive medium, thereby improving comprehensive corrosion and point corrosion resistance of the surface of the carbon steel effectively and improving the stability of the carbon steel in a thermal humid environment. The carbon steel has a self-repair function. The treated carbon steel for ship is high in corrosion resistance, high in hardness, compact in structure and good in glossiness,has certain ductility and solves the problems that an existing corrosion-resistant coating is thin, has gaps and is poor in wear resistance, is easy to fall under action of the corrosion medium and impact mechanical action, only can play a role within a short time and cannot achieve protection for a long time.

Description

technical field [0001] The invention belongs to the technical field of steel performance research, and in particular relates to a method for improving the corrosion resistance of marine carbon steel. Background technique [0002] The iron and steel industry is one of the basic pillars of the national economy. As an important structural material, it is widely used in almost all industries. With the development of modern industry and the development and utilization of marine resources, the shipbuilding industry has ushered in new opportunities for development. As a result, the demand for steel materials is becoming more and more urgent. [0003] Carbon steel is an iron-carbon alloy with a carbon content of 0.0218% to 2.11%. Also called carbon steel. Generally also contain a small amount of silicon, manganese, sulfur, phosphorus. Generally, the higher the carbon content in carbon steel, the greater the hardness and the higher the strength, but the lower the plasticity. Car...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C23C22/18C23C22/78C23C22/73
CPCC23C22/18C23C22/78C23C22/73
Inventor 谢枫杨胜
Owner 安徽华飞机械铸锻有限公司