Non-Phosphate Calcium Tetraborate Coating for Cold Heading
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Solution Overview
Problem
Existing phosphate coating methods for metal materials in cold heading processes lead to phosphorizing, embrittlement, and environmental hazards, while requiring long treatment times and de-phosphating processes that degrade productivity.
Innovation Solution
A non-phosphate coating method using a solution comprising sodium tetraborate, sodium nitrite, calcium hydroxide, and water to form a calcium tetraborate coating layer, which prevents carbide attachment and phosphorizing, reducing treatment time and improving eco-friendliness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a phosphate coating layer is formed on the metal material surface, then lubrication is improved and seizure is prevented, but phosphorizing occurs during heat treatment causing embrittlement and strength reduction
Solution Approach 1:
The invention extracts and removes phosphorus-containing substances from the coating composition. The patent specifically formulates a coating solution without phosphate, using alternative compounds that do not contain phosphorus, thereby preventing phosphorizing during heat treatment while maintaining lubrication functionality.
Solution Approach 2:
The invention changes the chemical composition parameters of the coating solution by replacing phosphate-based compounds with non-phosphate alternatives. This parameter change eliminates phosphorus content in the coating, preventing phosphorizing penetration into the metal substrate during subsequent heat treatment processes.
2Reliability
If a phosphate coating treatment is performed, then lubrication layer formation is enabled, but de-phosphating process is required before heat treatment reducing productivity
Solution Approach 1:
The invention extracts phosphorus-containing substances from the coating system entirely. By using a phosphate-free coating solution, the de-phosphating step becomes unnecessary, eliminating this additional process step and improving production efficiency and productivity.
Solution Approach 2:
The invention enables continuous production by eliminating the interruptive de-phosphating process. The coating can be applied and then directly followed by heat treatment without intermediate processing steps, maintaining continuous workflow and improving overall productivity.
3Reliability
If a phosphate coating agent is used, then coating treatment can be performed, but treatment time is excessively long
Solution Approach 1:
The invention changes the chemical composition parameters of the coating solution to include compounds that react and form the coating layer more rapidly. The non-phosphate coating solution is formulated with ingredients that enable faster coating formation, reducing treatment time while maintaining effective lubrication performance.
4Reliability
If phosphate-based coating materials are used, then lubrication is achieved, but environmental pollution occurs due to phosphorus content
Solution Approach 1:
The invention extracts and eliminates phosphorus-containing substances from the coating system. By using a phosphate-free coating solution, the harmful environmental impact of phosphorus pollution is removed while alternative compounds provide the necessary lubrication function.
Solution Approach 2:
The invention converts the harmful phosphorus-containing coating system into a beneficial phosphate-free system. By replacing problematic phosphate compounds with environmentally friendly alternatives, the coating maintains its lubrication benefits while eliminating environmental harm.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively forms a lubrication layer that enhances lubrication and physical properties, prevents phosphorizing, and reduces coating treatment time, thereby improving productivity and environmental sustainability.
Implementation Method 1
a coating treatment process to form a coating layer on the surface of the metal material by dipping the metal material into a coating agent
Implementation Method 2
preventing a phosphorizing phenomenon, and producing an eco-friendly effect when forming a lubrication layer
Implementation Method 3
The phosphate coating layer reduces the friction, and repairs the surface of the metal material, thereby preventing the seizure in the plastic working process
Implementation Method 4
a lubrication layer is required on a friction interface between a mold and the metal material
Implementation Method 5
In the heat treatment process, the carbide may be attached to the metal material and the phosphorizing may occur
Data Source
AI summary
A non-phosphate coated metal material for plastic working includes a metal material, a coating layer formed on a surface of the metal material, and a lubrication layer on the coating layer. The coating layer includes calcium tetraborate. A method for manufacturing a non-phosphate coated metal material includes a pre-treatment process to remove foreign matters or scale from a surface of a metal material, a coating treatment process to form a coating layer on the surface of the metal material by dipping the metal material, which is subject to the pre-treatment process, into a coating agent, and a lubrication treatment process to form a lubrication layer on the coating layer through the contact between the coated metal material and a lubricating agent. The coating agent includes a non-phosphate treatment solution including at least one borate selected from sodium tetraborate and a hydrate thereof, sodium nitrite, calcium hydroxide, and water.