Silane-Modified Silicate Coating Composition for Zinc Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing aqueous coating compositions for cathodic corrosion protection are unstable and unsuitable for long-term storage due to the amphoteric behavior of zinc pigments, leading to hydrogen evolution and white rust, and require complex and costly pH adjustments, limiting their application and scalability.
Innovation Solution
A silane-modified silicate-based binder system that allows for pH adjustment within a stable range (pH 1 to 14), enabling the incorporation of zinc-containing pigments without precipitation, even in acidic conditions, thereby stabilizing the coating composition for extended periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If aqueous coating compositions are used for cathodic corrosion protection, then environmental and health risks are reduced, but the composition becomes unstable and unsuitable for long-term storage due to hydrogen evolution and white rust
Solution Approach 1:
The patent introduces a pH buffer system as an intermediary substance that mediates between the zinc pigments and the aqueous environment. The buffer maintains pH within a stable range (pH 1 to 14), preventing the amphoteric behavior of zinc that causes hydrogen evolution and white rust, thereby enabling long-term storage stability while preserving the environmental benefits of aqueous formulations
Solution Approach 2:
The patent applies parameter changes by controlling and maintaining the pH parameter within a specific stable range (pH 1 to 14). This parameter control prevents zinc pigments from undergoing harmful amphoteric reactions, stabilizing the coating composition for extended periods while allowing the use of environmentally friendly aqueous carriers
2Reliability
If zinc-containing pigments are incorporated into aqueous coating compositions, then cathodic corrosion protection is achieved, but the pigments cause hydrogen evolution and white rust due to amphoteric behavior
Solution Approach 1:
The pH buffer system acts as an intermediary between the zinc-containing pigments and the aqueous environment, controlling the chemical conditions to prevent harmful amphoteric behavior. This intermediary mechanism maintains pH stability that prevents hydrogen evolution and white rust formation while preserving the cathodic corrosion protection function
Solution Approach 2:
The patent converts the potentially harmful amphoteric behavior of zinc pigments into a beneficial stable system by controlling pH within the stable range. The same zinc pigments that could cause hydrogen evolution and white rust are instead stabilized to provide reliable cathodic corrosion protection when pH is properly controlled
3Stability of the object's composition
If pH adjustment is performed to stabilize zinc pigments, then storage stability is improved, but complex and costly pH adjustments are required
Solution Approach 1:
The patent implements self-service by incorporating a pH buffer system that automatically maintains pH within the stable range (pH 1 to 14). The buffer system self-regulates pH conditions without requiring complex external adjustment mechanisms, reducing process complexity and cost while ensuring storage stability
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 system provides a stable aqueous coating composition that can store zinc-containing pigments for months, facilitating efficient production of cathodic corrosion protection coatings with improved durability and reduced environmental and health risks.
Implementation Method 1
A silane-modified silicate-based binder system that allows for pH adjustment within a stable range (pH 1 to 14), enabling the incorporation of zinc-containing pigments without precipitation, even in acidic conditions
Implementation Method 2
The silane-modified silicate is obtained by a silane in the presence of a silicate at a basic pH
Implementation Method 3
cathodic corrosion protection can be achieved by applying an external electrical voltage, but it is also possible to combine the protective metal with a less noble metal, i.e. a metal with a lower, i.e. more negative electrochemical standard potential
Data Source
AI summary
The invention relates to an aqueous coating composition containing a silicate-based binder and at least 30% by weight of metal particles, based on the coating composition, and to its use.