Nickel Cold-Spray Coating for CISCC-Resistant Storage Canisters
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Solution Overview
Problem
Existing stainless steel canisters for nuclear material storage are susceptible to chloride-induced stress corrosion cracking (CISCC), which can lead to cracks and breaches, necessitating improved protective barriers that enhance resistance to CISCC without catalyzing galvanic corrosion.
Innovation Solution
A protective coating is applied to storage containers using cold spraying nickel particles with nitrogen as a carrier gas, eliminating the need for pretreatment and resulting in high adhesion strength and low porosity coatings effective against CISCC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If stainless steel canisters are used for nuclear material storage, then the storage capacity and structural strength are improved, but the susceptibility to chloride-induced stress corrosion cracking increases
Solution Approach 1:
The patent applies a nickel coating layer on top of the stainless steel canister substrate, creating a composite structure. The nickel layer serves as a protective barrier that prevents chloride ingress to the stainless steel substrate, thereby eliminating CISCC susceptibility while maintaining the structural strength of the underlying stainless steel canister.
2Reliability
If traditional coating methods are used to protect against CISCC, then the protective barrier is established, but the risk of galvanic corrosion increases
Solution Approach 1:
The patent changes the chemical composition parameter of the coating material by selecting nickel specifically. Nickel is chosen because it is cathodic to stainless steel in the galvanic series, which prevents galvanic corrosion when the coating is damaged or has porosity. This parameter change in material selection resolves the contradiction between providing protective barrier and avoiding galvanic corrosion.
3Manufacturing precision
If cold spraying with helium is used, then the coating quality is improved, but the manufacturing cost increases
Solution Approach 1:
The patent changes the carrier gas parameter from helium to nitrogen. Nitrogen is significantly cheaper than helium while still providing adequate cold spray coating quality. This parameter change in the carrier gas composition resolves the contradiction between coating quality and manufacturing cost by finding a cost-effective alternative that maintains acceptable coating performance.
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 provides economically viable coatings with enhanced resistance to CISCC and general corrosion, maintaining the integrity of nuclear material storage systems.
Implementation Method 1
nickel particles are deposited by cold spraying a composition comprising nickel particles and a carrier gas comprising nitrogen
Implementation Method 2
depositing nickel particles on at least one surface of the substrate to produce the protective coating
Data Source
AI summary
Described herein, are methods for providing a protective coating to a storage container for storing nuclear material, the method comprising depositing nickel particles on at least one surface of the substrate to produce the protective coating, wherein the nickel particles are deposited by cold spraying a composition comprising nickel particles and a carrier gas comprising nitrogen. In one aspect, the carrier gas consists essentially or consists only of nitrogen. The methods do not require pretreatment or modification of the nickel particles prior to cold spraying, which makes the methods described herein economically practical. The coatings produced by the methods described herein possess several advantageous properties including, but not limited to, high adhesion strength to the storage system and low porosity. The coatings produced by the methods described herein are effective against chemical attack such as, for example, CISCC.